Cutshort logo
channelplay limited logo
Field Sales Executive
Field Sales Executive
channelplay limited's logo

Field Sales Executive

Kyatham Ashok's profile picture
Posted by Kyatham Ashok
1 - 10 yrs
₹2.6L - ₹2.7L / yr
Hyderabad, Visakhapatnam
Skills
Sales
Field Sales
Marketing
Channel Sales
sales
Hiring for Field Sales at Mehadipatnam
Salary 12500 inhand 15800 CTC, 2500 allowance,
Job Role
Visiting 15 existing customer and converting from off line to On line per day
Explaining online Best price store app features, benefits, offers
Generating 3 orders per day
Incentive per order and max cap for incentive is 5000/-
Can earn up to 17500 inhand
Location Surroundings of Store like Mehadipatnam, Rajendranagar. Attapur, Falaknuma, Chandrayangutta,old city
Qualification plus2/Graduation
Byke and smart phone must
Must have experience in sales /Marketing


Regards,
Ashok
Read more
Users love Cutshort
Read about what our users have to say about finding their next opportunity on Cutshort.
Shubham Vishwakarma's profile image

Shubham Vishwakarma

Full Stack Developer - Averlon
I had an amazing experience. It was a delight getting interviewed via Cutshort. The entire end to end process was amazing. I would like to mention Reshika, she was just amazing wrt guiding me through the process. Thank you team.
Companies hiring on Cutshort
companies logos

About channelplay limited

Founded :
2006
Type :
Services
Size :
100-1000
Stage :
Profitable

About

Technology Solutions, Consulting Services & Execution Capability for Retail & Distribution. 6000+ employees across 300+ cities & 100+ bluechip customers.
Read more

Connect with the team

Profile picture
Sourav Ghosh
Profile picture
Rohit Kumar
Profile picture
Dhiren yadav
Profile picture
Sudeeksha Shetty
Profile picture
Mohamed mohideen
Profile picture
Kyatham Ashok
Profile picture
Irfan Ali
Profile picture
NIKITA MORAES

Company social profiles

linkedin

Similar jobs

Financial Services Company
Financial Services Company
Agency job
via Peak Hire Solutions by Dhara Thakkar
Pune
4 - 8 yrs
₹10L - ₹13L / yr
SQL
databricks
PowerBI
Windows Azure
Data engineering
+9 more

Review Criteria

  • Strong Senior Data Engineer profile
  • 4+ years of hands-on Data Engineering experience
  • Must have experience owning end-to-end data architecture and complex pipelines
  • Must have advanced SQL capability (complex queries, large datasets, optimization)
  • Must have strong Databricks hands-on experience
  • Must be able to architect solutions, troubleshoot complex data issues, and work independently
  • Must have Power BI integration experience
  • CTC has 80% fixed and 20% variable in their ctc structure


Preferred

  • Worked on Call center data, understand nuances of data generated in call centers
  • Experience implementing data governance, quality checks, or lineage frameworks
  • Experience with orchestration tools (Airflow, ADF, Glue Workflows), Python, Delta Lake, Lakehouse architecture


Job Specific Criteria

  • CV Attachment is mandatory
  • Are you Comfortable integrating with Power BI datasets?
  • We have an alternate Saturdays working. Are you comfortable to WFH on 1st and 4th Saturday?


Role & Responsibilities

We are seeking a highly experienced Senior Data Engineer with strong architectural capability, excellent optimisation skills, and deep hands-on experience in modern data platforms. The ideal candidate will have advanced SQL skills, strong expertise in Databricks, and practical experience working across cloud environments such as AWS and Azure. This role requires end-to-end ownership of complex data engineering initiatives, including architecture design, data governance implementation, and performance optimisation. You will collaborate with cross-functional teams to build scalable, secure, and high-quality data solutions.

 

Key Responsibilities-

  • Lead the design and implementation of scalable data architectures, pipelines, and integration frameworks.
  • Develop, optimise, and maintain complex SQL queries, transformations, and Databricks-based data workflows.
  • Architect and deliver high-performance ETL/ELT processes across cloud platforms.
  • Implement and enforce data governance standards, including data quality, lineage, and access control.
  • Partner with analytics, BI (Power BI), and business teams to enable reliable, governed, and high-value data delivery.
  • Optimise large-scale data processing, ensuring efficiency, reliability, and cost-effectiveness.
  • Monitor, troubleshoot, and continuously improve data pipelines and platform performance.
  • Mentor junior engineers and contribute to engineering best practices, standards, and documentation.


Ideal Candidate

  • Proven industry experience as a Senior Data Engineer, with ownership of high-complexity projects.
  • Advanced SQL skills with experience handling large, complex datasets.
  • Strong expertise with Databricks for data engineering workloads.
  • Hands-on experience with major cloud platforms — AWS and Azure.
  • Deep understanding of data architecture, data modelling, and optimisation techniques.
  • Familiarity with BI and reporting environments such as Power BI.
  • Strong analytical and problem-solving abilities with a focus on data quality and governance
  • Proficiency in python or another programming language in a plus.
Read more
Optiontown
Sumiti Saini
Posted by Sumiti Saini
Delhi, Gurugram, Noida, Ghaziabad, Faridabad
3 - 7 yrs
₹2L - ₹12L / yr
Mobile App Development
skill iconFlutter
DART

We are seeking a skilled Flutter Developer with a strong command of Dart, REST API integration, and UI/UX enhancements. The ideal candidate will have experience with redesigning UI components to improve the user experience while leveraging MVM and MVVM architectural patterns.Additionally, a knowledge of Java, JSP, Servlets, AJAX, SOAP, and REST APIs will be considered a plus. Familiarity with SVN for version control management and production-level deployment is also essential.

Responsibilities:

Develop, maintain, and enhance mobile applications for iOS and Android using Flutter.

Collaborate with design teams to redesign UI components for improved usability, aesthetics, and performance.

Implement responsive design practices to ensure a seamless user experience across various devices and screen sizes.

Integrate REST APIs and ensure smooth communication between mobile apps and backend services.

Apply MVM and MVVM architectural patterns for scalable, maintainable app development.

Collaborate with backend teams for API integration and optimize app data handling.T

roubleshoot, debug, and resolve issues related to performance, UI bugs, and API interactions.

Manage version control processes using SVN, including handling code branches, merges, and revisions.

Set up CI/CD pipelines for streamlined testing, building, and deployment processes.

Oversee production-level deployment, including Google Play and App Store submissions.Write unit and widget tests to ensure stability and reliability.

Stay updated on the latest Flutter, Dart, and mobile development trends.

Required Skills:

Proficiency in Dart programming and experience building mobile applications using Flutter.

Strong experience in UI/UX design and redesigning UI components for improved user experience and performance.

In-depth knowledge of MVM and MVVM architectural patterns for scalable and maintainable Flutter apps.

Strong experience with REST API integration, including handling JSON data in Flutter applications.

Familiarity with state management solutions such as Provider, Riverpod, or Bloc etc.

Experience using SVN for version control management, including handling branches, merges, and revisions.

Solid understanding of unit testing and widget testing in Flutter.Knowledge of CI/CD tools and practices for efficient app testing and deployment.

Experience with production-level deployment processes for App Store and Google Play submissions.

Preferred Qualifications (Plus Points):

Java development experience, particularly in building backend services.

Knowledge of JSP, Servlets,AJAX and web application development.

Familiarity with SOAP and REST APIs for integrating backend services with mobile apps.

Experience with cloud services such as Firebase, or Google Cloud Console for backend integration.

Understanding of mobile app authentication (OAuth, JWT) and API security practices.

Familiarity with native Android/iOS code and experience working with Flutter plugins.

Strong understanding of mobile app performance optimization and debugging techniques.

Education & Experience:

Bachelor’s Degree from IIT, DTU, BITS in any Engineering field (required).

Preference for an additional MBA degree from a top business school.3-7 years of experience in Flutter development, with a strong focus on UI enhancements, version control management, REST API integration, and SVN.

Additional experience with Java, JSP, Servlets, AJAX, SOAP, and REST APIs will be highly regarded.

Job Types: Full-time, Permanent

Benefits:

  • Paid sick time
  • Paid time off
  • Provident Fund
Read more
Marketwick
Nirupama KM
Posted by Nirupama KM
Noida
0 - 2 yrs
₹2.5L - ₹5.5L / yr
Sales
Communication Skills

Thank you for showing interest in joining our growing network of hiring partners! b

We’re hiring International Telesales Executives for one of our esteemed clients — a reputed global BPO with offices in India, UAE, and Egypt. This is your chance to join a high-energy, international sales team and grow your career!

Role Highlights:

Position: International Telesales Executive

Location: Noida – Sector 62 (Onsite)

Shift Timings: 10:30 AM – 7:30 PM (Monday to Saturday)

Experience: 0–2 Years (Freshers with excellent communication skills are welcome)

Compensation: Full-Time Role + Performance-based Incentives

Interview Mode: Virtual

Key Responsibilities:

Make outbound calls to promote and sell mobile plans for an international telecom brand Persuade and convert leads into successful sales

Meet daily, weekly, and monthly sales targets

Candidate Requirements:

Strong verbal communication in English & Hindi

Telesales experience is a plus

Confident, persuasive, and motivated by targets

Quick learner, especially for international sales techniques

Professional, punctual, and committed to growth

What We Offer:

High incentives and monthly bonuses

Fast-track career progression

Hands-on training and expert mentoring

Supportive and vibrant team environment

Job Type: Full-time

Pay: ₹9,071.68 - ₹45,104.32 per month

Read more
HaystackAnalytics
Ragina Nair
Posted by Ragina Nair
Remote only
3 - 5 yrs
₹12L - ₹15L / yr
User Experience (UX) Design
Sketch
InVision
Balsamiq
skill iconHTML/CSS
+4 more
HaystackAnalytics is looking for a user-experience (UX) designer able to understand our business requirements and any technical limitations, as well as be responsible for conceiving and conducting user research, interviews, and surveys, and translating them into sitemaps, user flows, customer journey maps, wireframes, mock-ups, and prototypes. The UX designer will also be expected to design the overall functionality of the product, and in order to ensure a great user experience, iterate upon it in accordance with user-testing.
Responsibilities
• Translate concepts into user flows, wireframes, mock-ups, and prototypes that lead to intuitive
user experiences.
• Facilitate the client’s product vision by researching conceiving, sketching, prototyping, and user-
testing experiences for digital products.
• Designing client-specific websites using available content management systems such as
WordPress along with other common web technologies
• Defining information architecture, interactions and hierarchy of content following the user-
centred design (UCD) principles.
• Simplifying complex and ambiguous briefs to arrive at actionable goals with minimal direction.
• Facilitate stakeholder workshops, doing presentations and approaching with a problem-solving
mindset.
• Pitching creative concepts to internal teams and clients, lateral thinking, brainstorming and
ideation.
• Designing for client-specific requirements with a combination of experience across designing for
mobile and web focused applications, as well as complex and information-rich interfaces.
• Design and deliver wireframes, user stories, user journeys, and mock-ups optimized for a wide
range of devices and interfaces.
• Develop projects from creative concept to final deliverable in traditional and new media
(augmented/virtual reality, social media, etc.).
• Ensure a consistent approach to design, employing design systems, bring efficiency in your
process, creating icons and graphics.
• Take a user-centred design approach and rapidly test and iterate your designs.
• Collaborate with other team members and stakeholders.
• Ask smart questions, take risks, and champion new ideas.

Requirement
• Three or more years of UX design experience. Preference will be given to candidates who have
experience designing complex solutions for complete digital environments.
• Expertise in standard UX software such as Sketch, Figma, InVision, UXPin, Balsamiq, Framer, and
the like is a must. Basic HTML5, CSS3, and JavaScript skills are a plus. Experience with Principle,
Webflow, After-Effects and other prototyping and digital design tools is a bonus.
• A solid grasp of user-centred design (UCD), planning and conducting user research, user testing,
A/B testing, rapid prototyping, heuristic analysis, usability, and accessibility concerns.
• Ability to communicate design processes, ideas, and solutions clearly and effectively to teams and
clients.
• A clear understanding of the importance of user-centred design and design thinking.
• Ability to work effectively in a team setting including synthesizing abstract ideas into concrete
design implications.
• Be excited about collaborating and communicating closely with teams and other stakeholders via
a distributed model, to regularly deliver design solutions for approval.
• Be open to receiving feedback and constructive criticism.
• Be passionate about all things UX and other areas of design and innovation. Research and showcase
knowledge in the industry’s latest trends and technologies.
• Ensuring a sharp eye towards attention to details in designing pixel perfect digital interfaces.
• Knowledge of best UI practices and staying updated with upcoming digital trends and new digital
technologies.
• Fluent in English - verbal and written.

Who are we?
HaystackAnalytics is a company working in deep technology of genomics, computing, and data science for creating the first of its kind clinical reporting engine in healthcare. We are a new but well-
funded company with a tremendous amount of pedigree in the team (IIT Founders, IIT & IIM coremteam). Some of the technologies we have created are a global first in infectious disease and chronic
diagnostics. As a product company creating a huge amount of IP, our Technology and R&D team are our crown jewels. With early success of our products in India, we are now expanding to take our
products to international shores.
Read more
oto capital
at oto capital
3 recruiters
Bhavya  GN
Posted by Bhavya GN
Mumbai
2 - 8 yrs
₹3L - ₹5.5L / yr
Accounts payable
Account Management
Financial statements
Taxation
Compliance
Role – Assistant Manager for Accounts and Finance

1. Responsible for handling Accounts, Taxation and compliance functions.
2. Taking care of monthly book closer and preparation of monthly/quarterly financial
statements.
3.  Responsible for all Direct and Indirect tax compliances and labor compliances including
returns and coordination with vendors (i.e  Taking care of monthly and quarterly compliances
such as GST, TDS,PF, ESI and PT payments and returns)
4. Responsible for the completion of internal and external audits in a given time by coordinating with
auditors.
5. Preparation of annual financial statements
6. Good knowledge on all the accounting standards.
Read more
Diatoz Solutions Private Limited
at Diatoz Solutions Private Limited
1 video
1 recruiter
Rachana Pattem
Posted by Rachana Pattem
Bengaluru (Bangalore)
2 - 4 yrs
₹2L - ₹7L / yr
skill iconReact.js
skill iconJavascript
skill iconHTML/CSS

About us:

Maneuvering futuristic technologies to create such a socio-economic impact is DIATOZ Solutions Private Limited, an MSME registered under the government of India. With three business lines – services, products and consulting – DIATOZ is disrupting IT industry in India with a wide range of solutions like ezenotes, e2ehiring, salver, patapet, airpetgo, hectocommerce, ezevision, real-estate automation, first-of-its-kind agricultural marketplace, and many more. Something besides the high-end technology frameworks that takes a technology company beyond the margins of normality is the impact they create in the market. Founded in 2018, within a couple of years of its inception has come a long way. With a 110+ people strong talented workforce, the company has been contributing to Digital initiatives with its range of digital solutions. DIATOZ’s impressive portfolio in the fields of agriculture, education, hiring, pet care, AI/ML and real-estate is all set to concoct a revolution by progressively impacting the daily lives of billions of common people.



Kindly refer the below link for more details.

 

Start-up of the year 2020 –

https://www.cioinsiderindia.com/magazine/startups-of-the-year-december-2020/#page=26

Winner of Young Achievers Award 2020 –

https://www.iafindia.com/mr-monuranjan-borgohain/">https://www.iafindia.com/mr-monuranjan-borgohain/

 

 

Title – Front End Developer

Region: Bangalore

Employment Type: Full Time Regular Employee

Position: Software Engineer

Year Experience: 2-4yrs

 

 

Job Responsibilities and/or Success Factors:

 

  • Review customer requirement, design flow and implement
  • Review integration and regression test plans created by QA
  • Supports users by developing documentation and assistance tools
  • Required skills and experience include:
  • BE in Computer Science or other field of study and applicable work experience
  • Strong proficiency with Typescript.
  • Highly proficient in React.js framework and its core principles such as components, reactivity, and the virtual DOM.
  • Basic understanding of front-end technologies.
  • Good Knowledge of Database like PostgreSQL and MSSQL
  • Proficient understanding of code versioning tools, such as Git and SVN.
  • Complete ownership in development and ensuring high performance and responsiveness to requests from the front-end.
  • Knowledge of and desire to work in an agile development environment.
  • Must have strong teamwork orientation and the ability to foster collaboration within and across teams.
  • Should have motivation to learn new technologies in server-side web application.
  • Should follow the best practices in the industry while coding.

 

Skills required: JavaScript, React.js, Graph QL Basic, Context API provider, Git

 

Read more
Funded Youth Hospitality Startup
Funded Youth Hospitality Startup
Agency job
via Unnati by Seemi Ejaz
Delhi
6 - 8 yrs
₹12L - ₹15L / yr
Interior design
Interior Designer
AutoCAD
Google SketchUp
3D design
+3 more
Here is an opportunity to build a glowing career in a vibrant and intellectually challenging environment!

Our client is a 5-year-old travel and hostel space providing platform, a Youth Hotel chain, where the spaces are designed for work and leisure. Their mission is to provide quality spaces for youths looking for hostel options and to other travelers across locations in India. They provide clean and hygienic dorms and private rooms along with different facilities like Wi-fi, travel helpdesk, fully stocked kitchens, lockers and laundry services, etc.

They are currently providing 800 beds in 13 locations, and plan to add another 1600 in the next few months, with the aim to add at least a lac bed in the near future. The spaces offered by them are highly rated by their customers and are preferred over other competitors for the location and services offered within a decent budget. Invested by some very well known names across Asia, it provides their team with a work culture that thrives on modern yet social and explorative values.

As a Sr. Interior Designer, you will be responsible for overseeing and leading a team of interior designers who will be designing the interiors of the various hotel properties.

What you will do:
  • Undertaking various projects related to designing, from understanding the concept to completion.
  • Understanding and outlining the design objective and accordingly sketching the design plans for various projects.
  • Implementing the design plans based on the business requirements and closing the same on a timely basis.
  • Having a tap on various resources required for the projects including but not limited to, furniture, materials, decor and finishes while keeping within budget.
  • Supervising ongoing sites and also fine-tuning the design playbook.
  • Traveling across sites to make sure the on-going projects are on-track and also to strategize projects for future needs.
  • Working closely with multiple internal as well as external stakeholders, including but not limited to, designers, architects, decorators etc., for every project undertaken.
  • Innovating constantly to optimize various project schedules and standardizing vendors, processes and BOQs.
  • Ensuring compliance of relevant laws & regulations related to designing concepts.
  • Participating, deciding and having a tap on budget, cost, inventory and all other such related project details.
  • Updating and maintaining database consisting of relevant project details and reporting the same to the business in regular intervals.

Desired Candidate Profile

 

What you need to have:
  • Graduation is a must and also 7-8 years of relevant experience in interior designing.
  • Have an experience of optimizing and standardizing transformation costs, managing vendors and also extensive site execution experience.
  • Team handling experience in a must.    
  • Willingness to travel extensively.    
  • Good communication, listening and presentation skills.    
  • Attention to detail, ability to multitask and a go-getter attitude is required.    

 

Read more
Tophatter
Remote only
3 - 5 yrs
Best in industry
skill iconRuby on Rails (ROR)
skill iconRuby
Agile/Scrum
MySQL
Linux/Unix
+1 more
We're looking for highly motivated software engineers to join our small and growing Seller Engagement team in India.
 
The Seller Engagement team's mission is to build, shape and scale the Tophatter platform for our sellers all over the world to enable them to they can sell anything, and build and control their business with sustainable economics. The team works in tandem with other teams globally, who're focused on the buyer side of the business.
 
We are a fully distributed team, all over the country (current team members are in Andhra Pradesh, Karnataka, Kerala, Maharashtra, Tamil Nadu).
 
For more details about our culture, teams, and growth, please https://medium.com/product-engineering-tophatter/tophatter-engineering-from-the-culture-to-the-interview-1e32106817f0">review our interview process.


Required experience and skills

    • Bachelors degree in Computer Science and Engineering. Bonus: Masters degree.
    • 3+ years of total full-time work experience, preferably shipping SaaS applications.
    • Startup experience strongly desired and comfortable wearing multiple hats.
    • Proficiency in
    • 1. Ruby, Ruby on Rails, Mysql, Linux, Git, AWS, CI/CD, NewRelic.
    • 2. broad range of internet technologies and applications.
    • Knowledge of frontend technologies and frontend development experience is prized and a plus. We use React and React Native for our web app and mobile apps respectively.
    • Keep high quality performance, scalability, availability & security in mind to build, extend, and maintain web front end, mobile, and backend components of an evolving, real-time application
    • Write bug free clean, elegant, testable code that scales well, and is delivered on time.
    • Very curious and self driven.


Responsibilities

We use a rubric / career ladder as a framework to help our engineers grow in their careers. Please refer to the SDE II section in the rubric (https://docs.google.com/spreadsheets/d/1z_51E1mZ3qf0MBuAyfHjKE1HN6h_yghAx2WMaB1z-Ms/edit?usp=sharing">click to view) to understand our expectations on your role and responsibilities.

Your responsibilities include:
    • Completing moderately complex projects containing some ambiguity with minimal oversight
    • Troubleshooting and resolve most common production issues without assistance; being able to determine basic troubleshooting steps for uncommon production issues and occasionally contributes to on-call runbook
    • Removing most blockers individually and proactively escalate or seek assistance to become unblocked quickly

About Tophatter
Tophatter is re-imagining discovery commerce in a world increasingly connected by smartphones. We are the world's fastest, most entertaining marketplace for mobile shoppers.
 
We connect buyers and sellers around the world in real-time auctions that are both fast and effective. Leveraging our ever-expanding data for merchandising and personalization, nearly every item sells, and sells within an average of 90 seconds.
 
Tophatter is funded by leading Silicon Valley venture capital firms, including August Capital, Charles River Ventures, Sequoia Capital, and SV Angel. We have a distributed workforce and offices in Bangalore, Portland (OR), San Francisco, Shanghai, and Shenzhen.
 
We are actively expanding our team. In exchange for your precious time and energy, we offer incredible freedom and responsibility. If you're looking for a challenge, look no further. Let's grow together.
 
We are an equal opportunity employer and value diversity at our company. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.
Read more
Timble Technologies
at Timble Technologies
1 recruiter
Kirti Rawat
Posted by Kirti Rawat
NCR (Delhi | Gurgaon | Noida)
0 - 1 yrs
₹1L - ₹2L / yr
Sales
Telesales
Business Development
  • We are looking for an enthusiastic TeleCaller Representative to contribute in generating sales for our company.
  • You will be responsible for closing sales deals over the phone and maintaining good customer relationships.
  • An effective telesales representative must be an excellent communicator and have superior people skills.
  • They must be comfortable presenting products or services over the phone as well as dealing with complaints and doubts.
  • The goal is to help the company grow by bringing in customers and developing business.
Read more
Comp is a pioneer of technology driven mobility industry in
Comp is a pioneer of technology driven mobility industry in
Agency job
via Apurer India Private Limited by Ayesha Shaikh
Mumbai
2 - 4 yrs
₹3L - ₹5L / yr
IT operations
WCF Data Services
MS SQLServer
The selected candidate is expected to independently handle certain modules in the core engineering system. For this purpose, the person is expected to possess: 1. Strong understanding and the experience in the technical skills mentioned below. Ability to write good quality code with minimum bugs. 2. Experience of developing complete modules with complex business processes. 3. Ability to quickly grasp the business processes and translating them to technical requirements. 4. Sound analytical and logical capabilities. 5. Good verbal and written communication skills. Good technical documentation skills. 6. Excellent interpersonal capabilities and ability to work across diverse teams. 7. Proven ability to constantly learn new skills and technologies.
Read more
Why apply to jobs via Cutshort
people_solving_puzzle
Personalized job matches
Stop wasting time. Get matched with jobs that meet your skills, aspirations and preferences.
people_verifying_people
Verified hiring teams
See actual hiring teams, find common social connections or connect with them directly.
ai_chip
Move faster with AI
We use AI to get you faster responses, recommendations and unmatched user experience.
Did not find a job you were looking for?
icon
Search for relevant jobs from 10000+ companies such as Google, Amazon & Uber actively hiring on Cutshort.
companies logo
companies logo
companies logo
companies logo
companies logo
Get to hear about interesting companies hiring right now
Company logo
Company logo
Company logo
Company logo
Company logo
Linkedin iconFollow Cutshort
Users love Cutshort
Read about what our users have to say about finding their next opportunity on Cutshort.
Shubham Vishwakarma's profile image

Shubham Vishwakarma

Full Stack Developer - Averlon
I had an amazing experience. It was a delight getting interviewed via Cutshort. The entire end to end process was amazing. I would like to mention Reshika, she was just amazing wrt guiding me through the process. Thank you team.
Companies hiring on Cutshort
companies logos