Fullstack Developer

We’re building a powerful, AI-driven communication platform — a next-generation alternative to RingCentral or 8x8 — powered by OpenAI, LangChain, and SIP/WebRTC. We're looking for a Full-Stack Software Developer who’s passionate about building real-time, AI-enabled voice infrastructure and who’s excited to work in a fast-moving, founder-led environment.

This is an opportunity to build from scratch, take ownership of core systems, and innovate on the edge of VoIP + AI.

What You’ll Do

• Design and build AI-driven voice and messaging features (e.g. smart IVRs, call transcription, virtual agents)
• Develop backend services using Python, Node.js, or Golang
• Integrate OpenAI, Whisper, and LangChain with real-time VoIP systems like Twilio, SIP, or WebRTC
• Create scalable APIs, handle call logic, and build AI pipelines
• Collaborate with the founder and early team on product strategy and infrastructure
• Participate in occasional in-person strategy meetings (Delhi, Bangalore, or nearby)

Must-Have Skills

• Strong programming experience in Python, Node.js, or Go
• Hands-on experience with VoIP/SIP, WebRTC, or tools like Twilio, Asterisk, Plivo
• Experience integrating with LLM APIs, OpenAI, or speech-to-text models
• Solid understanding of backend design, Docker, Redis, PostgreSQL
• Ability to work independently and deliver production-grade code

Nice to Have

• Familiarity with LangChain or agent-based AI systems
• Knowledge of call routing logic, STUN/TURN, or media servers (e.g. FreeSWITCH)
• Interest in building scalable cloud-first SaaS products

Work Setup

• 🏠 Remote work (India-based, must be reachable for meetings)
• 🕐 Full-time role
• 💼 Direct collaboration with founder (technical)
• 🧘‍♂️ Flexible hours, strong ownership culture

Full Stack Engineers 

Location: Chennai 

Experience: 3+ Years 

Required Skills: 

• Strong knowledge of C#, .NET Core, Azure DevOps 
• Working knowledge of the JS frameworks – React, Angular etc 
• Experience in container-based development, AKS, Service Fabric etc 
• Experience in messaging queue like RabbitMQ, Kafka 
• Experience in Azure Services like Azure Logic Apps, Azure Functions 
• Experience in databases like SQL Server, PostgreSQL 

Job Description: 

We are looking for experienced product development engineers/experts who could join our cloud product engineering team to build the next gen applications for our global customers. If you are a technology enthusiast and have passion to develop enterprise cloud products with quality, security, and performance, we are eager to discuss with you about the potential role. 

Responsibilities: 

• Understand the business requirements and technical constraints and architect/design/develop. 
• Participate in the complete development life cycle. 
• Review the architecture/design/code of self and others. 
• Develop enterprise application features/services using Azure cloud services, C# .NET Core, ReactJS etc, implementing DevSecOps principles. 
• Own and be accountable for the Quality, Performance, Security and Sustenance of the respective product deliverables. 
• Strive for self-excellence along with enabling success of the team/stakeholders. 

Requirements: 

• 3 to 12 years of experience in developing enterprise software products 
• Knowledge of reporting solutions like PowerBI, Apache SuperSet etc 
• Knowledge of Micro-Services and/or Micro-Frontend architecture 
• Knowledge of Code Quality, Code Monitoring, Performance Engineering, Test Automation Tools 

When life gives you lemons and you can code both front and back with equal zest, you’re probably a Full Stack Developer we’d love on our team.

At Lemon Yellow, we’re looking for someone who thrives on building end-to-end web solutions using the MERN stack. From crafting intuitive front-ends to developing efficient, scalable back-end systems, you’ll be involved in shaping digital products from the ground up. If turning design mockups into pixel-perfect, high-performance applications excites you, we’re ready to build with you.

1. Core Responsibilities

• Build and maintain end-to-end web applications using the MERN stack.
• Act as a bridge between design and development to bring ideas to life with clean, scalable code.
• Support digital campaigns through intuitive and functional tech implementations.
• Design, develop, and deploy scalable front-end and back-end components.
• Write clean, maintainable code while collaborating with designers, marketers, and other developers.
• Translate product requirements and UI/UX wireframes into fully functional digital solutions.

2. API & Integration Management

• Implement RESTful APIs and connect third-party tools and services.
• Ensure smooth data exchange across platforms through secure integrations.
• Manage user authentication and authorization using mechanisms like JWT or OAuth.

3. Code Quality & Optimization

• Debug, profile, and optimize applications for performance and reliability.
• Maintain unit and integration test coverage for code robustness.
• Conduct code reviews and help improve internal coding standards.

4. Agile Collaboration

• Actively participate in agile activities: daily stand-ups, sprint planning, retros, and demos.
• Contribute to task estimation and cross-functional problem-solving.
• Stay responsive to project shifts and quick delivery needs.

5. Continuous Learning & Innovation

• Stay up to date with the latest development trends, tools, and practices.
• Share learnings and explore creative solutions for technical challenges.
• Experiment with emerging technologies and suggest process improvements.

Requirements

• Bachelor's degree in Computer Science, Software Engineering, or a related field.
• Minimum 1 year of hands-on experience building production-ready web applications using MongoDB, Express.js, React.js, and Node.js.
• Strong command of JavaScript (ES6+), HTML5, and CSS3.
• Experience with Git and version control systems
• Familiarity with RESTful API design, JSON, and authentication mechanisms (JWT, OAuth)
• Familiarity with cloud platforms (AWS, Azure, or GCP) and containerization (Docker).
• Basic understanding of CI/CD pipelines and automated testing.
• Strong analytical and problem-solving mindset.
• Detail-oriented with a passion for clean, maintainable code.
• Collaborative attitude with good verbal and written communication skills.

What are we offering?

Experience

• A chance for you to work in a thriving and growing environment. We foster a culture where growth is harmonious and creativity is always appreciated - you grow and you encourage others to do the same.

Exposure

• If you believe in your work, we believe in you. If you think your designs have the power to change the world, we'll help you bring your vision to life and give you the platform to prove it.

Empathy

• We have a carefully curated culture that promotes 2 things: fun & fulfilment. Your welfare - personal, professional, mental, and physical - becomes our responsibility. From Fitness Thursdays to learning sessions, we try to make you laugh & learn.

Who are we?

Lemon Yellow LLP is a user-centered UI/UX design agency, based out of Thane, Maharashtra. With international operations, an experienced mentorship, and a passionate team, we aim to design digital happiness.

How do you reach us?

Well, after you send in your application, it takes us 2-3 weeks to review it. Sometimes, not often, we might delay just a bit beyond that. This happens when our mailbox is flooded with applications.

We promise we won’t ghost you, you’ll definitely hear from us. In the meantime, feel free to explore our official website.

Who we are looking for:
- We are looking for an experienced Fullstack Web Application developer.
- You have gained around 5+ years of experience in the implementation of professional web applications using MVC frameworks.
- You are good at and follow strict OO design principles. OOP (Object Oriented Programming).

You will need a high proficiency and experience of:
- PHP based frameworks and other Open Source Technologies.
- MySQL
- REST API / JSON
- GIT
- HTML5/CSS3/JS
- Bootstrap
- Linux
- Laravel / NuxtJS
- Vue.js / React
- Memcached / Redis
- Adhere to Clean Code: SOLID principles and follow TDD
- Design Patterns like Repository pattern.
- PHPUnit
- SSO
- WebRTC
- Socket.IO

About You:
- Proud of the work you do and always being the best you possibly can
- Self-motivated and work well without supervision
- Committed to meeting deadlines
- Security conscious
- Since there is often a need to engage directly with the US Team, it is essential that you are confident and articulative.
- Able to work directly with customers at different stages of the project life cycle
- Must be willing and able to work flexible hours to accommodate client schedules

- Able to work directly with customers at different stages of the project life cycle
- Must be willing and able to work flexible hours to accommodate client schedules

Perks and Benefits:

- Work from Home or your favorite Destination

Preference:

- Candidates closer to Pune are preferred.

• Writing code for both the front end and the back end using MERN stack [MongoDB, Express.js, React.js and Node. js]
• Creating RESTful API with Node.js
• Maintaining all the required documents for your project.
• Constantly coming up with new ideas and also implementing them to improve the app’s performance.
• Writing code for the app logic as well as the business logic using Reducers, Actions and Redux framework.
• Create Unit and Integration tests to ensure the quality of code

• At iDC, we value your skills more than your background and some certificates. Attempting the assignment will be your door to the opportunity.
• Knowledge of the database and familiarity with the schema design in NoSQL (i.e MongoDB)
• A good understanding of the Software Development Lifecycle
• Knowledge of API design and development using REST
• Good understanding of object-oriented programming(OOP) and OOP patterns.
• Again, You don’t have to know it all in-depth but you should know how to dig the internet for finding the solutions.

• Expertise in Java server-side development: Core Java, Golang Servlets, Spring Core, React JS, Spring Boot with GRPC, and Hibernate.
• Exposure to microservice design patterns.
• Good knowledge in Data Structures, Algorithms, Object-Oriented Design, Analysis, Design patterns, and other computer science concepts.
• Knowledge of GraphQL, Kafka, PostgreSQL will be added advantage.

• Must have strong exposure working on Java Script 
  
• Proficient in Javascript frameworks (Vue Js / React Js) is a must
• Strong understanding of REST APIs
• Have experience with common front-end development tools such as Babel, Webpack, NPM is a definite advantage
• Good understanding of asynchronous request handling, partial page updates, and AJAX
• Proficient understanding of code versioning tools, such as GitHub
• Good to have working experience on CSS pre-processor either LESS or SASS
• Good understanding of BEM (Block, Element, Modifier) methodology

1. About the Job

Upside Digital is looking for a brilliant mind to help build its portfolio FinTech Startup, https://www.instaval.co/">InstaVal. The role of the FS Developer is ideal for smart coders who have the technical expertise and passion to turn our vision into a living product.

1. You will 

• Work with product lines to implement functional & non-functional business requirements into working software, including APIs, web services, etc.
• Enhance existing web solutions to ensure scalability across customer's new business requirements. 

1. You have

• Good Communication Skills. 
• Good personal work ethics and a well-rounded team player. 
• Ability to own and start projects with the team and manage to deliver in timely manner. 

1. You’re skilled at

• Microsoft .NET Framework (C#).
• Web development (http://asp.net/">ASP.NET, web services, WCF, JavaScript, NodeJS, AngularJS, HTML5, CSS).
• MongoDB or Microsoft SQL, MySQL, NoSQL.
• Staying on top of technology trend and contribute to technical design throughout project.

• Experience or familiar with a SaaS business.
• Past startup experience.

• InstaVal is a tech-enabled Business Valuation and Deal Discovery Platform made to promote equity investments in early stage business.
• Our vision is (i) to empower founders and (ii) enable ecosystem stakeholders to efficiently deliver their set of investment advisory & support services.
• An opportunity for you to be part of a global disruptive startup in the corporate finance space.
• We encourage creative thinking, independent responsibilities for business results & team collaboration.
• We have lives outside of work.

• Airtime: Full-time basis - five days a We’re not civil service officials neither.
• Compensation structure: Salary, Bonus, Equity.
• Location: Dubai,
• Unlimited paid time off as long as you get **** done.
• Start Period: November 2019