Backend Developer

About us

CallHub provides cloud based communication software for nonprofits, political parties, advocacy organizations and businesses. We have delivered over 200 millions messages and calls for thousands of customers. We help political candidates during their campaigns in getting their message across to their voters, conduct surveys, manage event/town-hall invites and with recruiting volunteers for election campaigns. We are profitable with 8000+ paying customers from North America, Australia and Europe. Our customers include Uber, the Democratic Party, major political parties in the US, Canada, UK, France and Australia. 

About the Role

As a Senior/Lead Software Engineer at CallHub, you will play a critical role in leading the development and enhancement of our cloud-based communication and telephony platform (SaaS). You will be responsible for designing, building, and optimizing scalable, high-performance backend systems that support the rapid growth of our global user base, ensuring reliability, security, and customer satisfaction at every step. In this role, you will collaborate with cross-functional teams of highly skilled software engineers, operations engineers, and product managers to drive innovation and create products that delight customers by exceeding their expectations. You will lead technical decision-making, mentor engineers, and be responsible for building robust systems that are always available, while also contributing to the development of automation tools to streamline processes and improve efficiency. We are seeking experienced engineers with a deep understanding of software engineering principles, strong problem-solving skills, and a passion for leading teams to deliver impactful, customer-focused solutions. If you thrive in a fast-paced environment, love solving complex technical challenges, and are excited about mentoring and guiding the next generation of engineers, we’d love to hear from you!

Your Responsibilities

• Lead the design, development, and deployment of complex, scalable, reliable, and highly available features for world-class SaaS products and services.
• Guide the engineering team in adopting best practices for software development, code quality, and architecture.
• Make strategic architectural and technical decisions, ensuring the scalability, security, and performance of software applications.
• Proactively identify, prioritize, and address technical debt to improve system performance, maintainability, and long-term scalability, ensuring a solid foundation for future development.
• Collaborate with cross-functional teams (product managers, designers, and stakeholders) to define project scope, requirements, and timelines.
• Mentor and coach team members, providing technical guidance and fostering professional development.
• Oversee code reviews, ensuring adherence to best practices and maintaining high code quality standards.
• Drive continuous improvement in development processes, tools, and technologies to increase team productivity and product quality.
• Stay updated with the latest industry trends and emerging technologies to drive innovation and keep the team at the cutting edge.
• Ensure project timelines and goals are met, managing risks and resolving any technical challenges that arise during development.
• Foster a collaborative and inclusive team culture, promoting open communication and problem-solving.
• Imbibe and maintain a strong customer delight attitude while designing and building products.

What we’re looking for

• 7+ years of experience in software engineering, with a proven track record of leading engineering teams and mentoring junior developers.
• Strong expertise in designing and developing scalable backend systems, web services, and REST APIs using Python/Django or similar frameworks.
• Solid understanding of cloud-based architectures and microservices, with experience in deploying and maintaining SaaS applications.
• Solid experience in software engineering principles, including CI/CD pipelines, unit testing, code reviews, and version control (e.g., Git).
• Proficiency in working with databases like PostgreSQL, and experience in optimizing queries and ensuring high availability.
• Deep knowledge of computer science fundamentals, including data structures, algorithms, and software design principles.
• Experience with frontend technologies such as React, JavaScript, HTML, and CSS, and an understanding of how they integrate with backend services.
• Ability to quickly adapt to new technologies and make informed technical decisions in dynamic environments.
• Strong attention to detail, with the ability to empathize with customer needs and translate them into impactful software solutions.
• Excellent written and verbal communication skills, with the ability to clearly articulate technical concepts to both technical and non-technical stakeholders.
• Collaborative team player, willing to support and work closely with cross-functional teams.
• Bachelor’s or Master’s degree in Engineering or Computer Science from a reputable institution.

What you can look forward to

• Leadership and Ownership: Lead and oversee the entire software development lifecycle, from system design and development (backend and frontend) to QA and DevOps, with a focus on driving high-impact projects.
• Strategic Impact: Witness the direct impact of your work on our users and the overall success of the company, shaping products and solutions that make a significant difference.
• Innovative Technologies: Stay at the forefront of technology by working with the latest tools and frameworks, as we continuously innovate to deliver reliable and scalable solutions for our customers.
• Collaborative Culture: Engage in a culture of openness and collaboration, where your insights and leadership help drive the company’s success and delight our customers.

Title: Python Developer

Job Type: Full-time

Responsibilities:

• Developing and maintaining Python-based applications.
• Writing clean, maintainable, and efficient code.
• Integrating user-facing elements developed by front-end developers with server-side logic.
• Identifying and fixing bottlenecks and bugs.
• Participating in code reviews.
• Collaborating with cross-functional teams to design, develop and implement new features.

Requirements:

• Bachelor's or Master's degree in Computer Science or a related field.
• Strong proficiency in Python and its frameworks such as Django or Flask.
• Understanding of fundamental design principles behind a scalable application.
• Familiarity with code versioning tools such as Git.
• Knowledge of databases such as MySQL, PostgreSQL or MongoDB.
• Good problem-solving skills and attention to detail.
• Excellent communication and collaboration skills.

Roles and Responsibilities

• Ability to create solution prototype and conduct proof of concept of new tools.

• Work in research and understanding of new tools and areas.

• Clearly articulate pros and cons of various technologies/platforms and perform

detailed analysis of business problems and technical environments to derive a

solution.

• Optimisation of the application for maximum speed and scalability.

• Work on feature development and bug fixing.

Technical skills

• Must have knowledge of the networking in Linux, and basics of computer networks in

general.

• Must have intermediate/advanced knowledge of one programming language,

preferably Python.

• Must have experience of writing shell scripts and configuration files.

• Should be proficient in bash.

• Should have excellent Linux administration capabilities.

• Working experience of SCM. Git is preferred.

• Knowledge of build and CI-CD tools, like Jenkins, Bamboo etc is a plus.

• Understanding of Architecture of OpenStack/Kubernetes is a plus.

• Code contributed to OpenStack/Kubernetes community will be a plus.

• Data Center network troubleshooting will be a plus.

• Understanding of NFV and SDN domain will be a plus.

Soft skills

• Excellent verbal and written communications skills.

• Highly driven, positive attitude, team player, self-learning, self motivating and flexibility

• Strong customer focus - Decent Networking and relationship management

• Flair for creativity and innovation

• Strategic thinking This is an individual contributor role and will need client interaction on technical side.

Must have Skill - Linux, Networking, Python, Cloud

Additional Skills-OpenStack, Kubernetes, Shell, Java, Development

• Must have applied knowledge of Python and trending data libraries.
• Experience on Python Backend Development framework like Flask, Django etc.
• Must have experience working on AWS (Lambda, EC2, S3, API Gateway etc).
• Must have experience working on SQL optimization and performance tuning.
• Nice to have technical knowledge in any ETL/ BI Tools (Datastage, Informatica, Alteryx, Microstrategy, RDM, MDM etc.

Backend/Fullstack Developer

About the Company:

Company is India’s largest and best-established digital wealth management service that helps its customers create wealth for their long-and-short-term goals. Founded in 2012, Company is a pioneer in the digital financial services category and is recognised for creating simple and elegant user experiences in a complex domain. We do this by simplifying complex investing concepts and automating best practices, so our customers can grow their wealth without worry. We achieve this by combining cutting-edge technology, data-driven algorithms, awesome UX and friendly customer support. Our task is ambitious and we like to work hard as well as smart. We want to build a team that relishes challenges and contributes to a new way of thinking and investing in India. We are also invested in the growth of our colleagues and providing a supportive and thriving working environment for everyone. We have been recognised by Great Place To Work® as one of India’s best companies to work for.

Role specific info:

• 4-12 years of experience building good quality production software
• Excellent knowledge of at least one ecosystem based on Elixir/Phoenix, Ruby/Rails, Python/Django, Go/Scala/Clojure
• Good OO skills, including strong design patterns knowledge
• Familiar with datastores like MySQL, PostgreSQL, Redis, Redshift etc.
• Familiarity with react.js/react-native, vue.js etc. • Knowledge of deploying software to AWS, GCP, Azure
• Knowledge of software best practices, like Test-Driven Development (TDD) and Continuous Integration (CI)

What would you do here:

• Writing quality code using language best practices.
• Working in a highly collaborative team.
• Building good software using the latest tools and techniques.
• Participating in design reviews, coding modules, code reviews and unit testing.
• Taking ownership of quality and usability of your code.
• Mentoring co-workers.
• Leading efforts in improving technology architecture.

• Back-end software development
• Software engineering and designing data models and write effective APIs
• Working together with engineers and product teams
• Understanding business use cases and requirements for different internal teams
• Maintenance of existing projects and New feature development
• Consume and integrate classifier/ ML snippets from Data science team

What we are looking for:

• 2+ years of industry experience with the Python and Django framework.
• Degree in Computer Science or related field
• Good analytical skills with strong fundamentals of data structures and algorithms
• Experience building backend services with hands-on experience through all stages of Agile software development life cycle. 
• Ability to write optimized codes,debug programs, and integrate applications with third party tools by developing various APIs
• Experience with Databases.
• Experience with writing REST-APIs.
• Prototyping initial collection and leveraging existing tools and/or creating new tools
• Experience working different types of datasets (e.g. unstructured, semi-structured, with missing information)
• Ability to think critically and creatively in a dynamic environment, while picking up new tools and domain knowledge along the way
• A positive attitude, and a growth mindset

Bonus:

• Experience with relevant Python libraries such as Requests, sklearn, Selenium
• Hands on experience in Machine learning implementations
• Experience with Cloud infrastructure (e.g. AWS) and relevant microservices
• Good Humor