
Software Development Engineer III (SDE3)
Location: Mumbai / Bangalore | Experience: 4+ Years
About SolarSquare:
At SolarSquare we are building the Home-Energy brand of future India. We help homes switch to rooftop solar and move away from traditional coal electricity. We are a full-stack D2C residential solar brand - designing, installing, maintaining (after-sales) and financing solar systems for home-owners across India.
In 3 years we have scaled to become the leading residential solar brand in India. We are obsessed with quality, customer service and innovating to make it simple for homes to switch to solar. We are looking for leaders to join us in this mission.
Know us a bit better through these links:
- How SolarSquare is Simplifying Residential Solar in India I Ft. Shreya Mishra and Neeraj Jain
- Featured by TIME Magazine- as World’s Top Greentech Companies of 2025
- Solarsquare Raises $40 million in Series B Funding Round
- How SolarSquare has a chance to become a home energy brand in India
- Techcrunch SolarSquare article
- Elevation - Podcast with SolarSquare Founders
- Startup by IIT Grads Helps Indian Homes Run on Zero Electricity, Earns Rs 200 Crore in Revenues
- The Climate Conversations ft Solar Square
- Elevation Capital - SolarSquare
What this role is
You are an engineer who leads projects at the scope of a service or major subsystem.
That means: when a problem lands on your desk, it's usually ambiguous. Your job is to turn it into a clear problem statement, design a system to solve it, ship it through to production, and own how it behaves once it's there. You'll work with one or two engineers on most projects, and you'll be the technical person product, ops, and other engineering teams talk to about that domain.
You're not a senior individual contributor who only writes code for assigned tickets. You're not a tech lead who's stopped writing code. You're the person between those two — still hands-on, but increasingly the one shaping what gets built.
What you'll do
- Solve 2–4 complex problems a year end-to-end: shape the problem, design the system, ship it, monitor it.
- Design single-service systems independently. Define API contracts, data models, scale and reliability requirements. Document and review your design with peers before building.
- Turn ambiguity into clarity. Take half-formed product tasks and partner with PMs to define what's actually being built. Push back when the ask doesn't make sense.
- Stay hands-on. Write code that goes into production. Drive code reviews. Debug across service boundaries. Refactor when the codebase needs it.
- Mentor 1–2 junior engineers. Be someone's first reviewer. Pair when it helps. Take their growth as your responsibility, not a side activity.
- Be in hiring. Interview candidates regularly. Help shape the interview bar for your function.
- Own outcomes, not output. Track the business or operational metric your work moves. If it doesn't move, that's a problem you own — not a problem you delivered to.
What we're looking for
- Over 4 years of professional experience in software development, specifically focused on solving large-scale technical challenges.
- Expert-level proficiency in at least one major programming language (such as Java, GO, Rust, NodeJS etc) with a focus on writing scalable, maintainable, and unit-tested code.
- Strong command of object-oriented design, design patterns, and the creation of intuitive class-level interfaces.
- Hands-on experience with multi-threading, concurrency, and Test-Driven Development (TDD).
- Deep understanding of relational databases (Postgres) and various NoSQL technologies like HBase, Elasticsearch, or Aerospike, Cassandra
- Comprehensive knowledge of the full software development life cycle on Linux platforms.
- Proven ability to build highly scalable applications that manage complex business logic and massive datasets.
- A proactive, "go-getter" mindset characterized by high energy and dedication to task ownership.
- Experience thriving in fast-paced startup environments with a strong sense of commitment and accountability.
- A passionate drive to tackle complex, real-world problems through innovative engineering.
- You've made and defended technical decisions, picked up problems no one assigned, or built things people use that no one asked for.
- Strong fundamentals in your primary stack — concurrency, data modeling, debugging across systems, performance work. We're stack-agnostic for the right person.
- Experience designing systems with explicit attention to scale, reliability, and cost — not just functional correctness.
- Collaborate with a wide range of stakeholders to monitor project outcomes and iteratively refine features based on real-world impact.

Similar jobs (10)
•Employment Type: Full-Time
•Experience: 8-10 Years
•Notice Period: Immediate Joiners / Serving Notice only
•MNC Background (Mandatory)
Required Knowledge & Experience:
•Strong expertise in full-stack technologies including Java, Spring Boot, Node.js, React, Angular, PostgreSQL, and AWS.
•Excellent verbal and written communication skills.
•Financial Services or Insurance domain experience is preferred.
•Proven experience in developing enterprise-scale applications and complex technology platforms.
•Strong understanding of software design patterns, frameworks, and reference architectures.
•Hands-on experience with CI/CD pipelines, DevOps practices, and deployment automation.
•Ability to lead development teams, mentor engineers, and drive technical decision-making.
•Strong analytical and problem-solving skills with an innovation-driven mindset.
Education & Experience:
•Bachelor's degree in Computer Science, Information Technology, Engineering, or a related discipline.
•Master's degree in Computer Science or Engineering is preferred.
•Minimum 8 years of IT experience.
•5+ years of experience in the Financial Services or Insurance domain is preferred.
Design and develop scalable web applications using MEAN/MERN stack.
Build & optimize AI/LLM workflows using LangChain or LangGraph.
Implement vector storage & semantic search using FAISS / Pinecone / Chroma / Milvus.
Build APIs, microservices, and integration layers.
Optimize application performance and ensure code quality.
Collaborate with cross-functional teams (product, design, backend, DevOps).
Must-Have Skills
- Strong experience in Node.js, Express.js, MongoDB, and Angular/React.
- Hands-on experience in LLM apps, RAG pipelines, Vector Databases.
- Practical knowledge of LangChain / LangGraph.
- Experience with REST APIs, authentication, and integrations.
- Solid understanding of Git, CI/CD, and cloud platforms (AWS/Azure/GCP).
● Be an active contributor to the team to plan, design and build solutions.
● Work closely with founders to decide the direction of the product.
● You will collaborate closely with other engineers of the team and lend your help in
your areas of expertise.
● Implement UI for our web app.
● Build microservices to support new functionality.
● Bind our front and back end services together.
● Deliver maintainable and high-quality code
● Work in an environment that supports your individual growth
● Ensure that our customer’s experience is the very best it can be. You might have to
interact with the dev team of our initial clients.
Who you are
● You are intensely curious and passionate about the prospect of diving deep in multiple
technologies, platforms, and problem spaces, even if they are currently unfamiliar
● You embrace uncertainty. Our space is a rapidly growing one and specifications are
continuously changing.
● You are experienced with modern React/TypeScript/CSS/HTML coding, testing,
debugging and automation techniques
● You care about the user experience and know how to build user-friendly web
applications
● You have experience with continuous delivery. Experience with AWS is a bonus
● You have a working understanding of object oriented and functional programming
paradigms
● You care about web technologies, exploring data, and software design (and video
calls!)
● You have excellent analytical and problem-solving skills, and can communicate your
ideas
● Experience with WebRTC, iOS, Android, or C++ development is a bonus
● A degree in Computer Science or a similar area are bonuses
We are looking for a MEAN Stack developer to join our Technology team. As a full-stack developer, you will work closely with our Technical Architectural members to develop microservices that focus on the educational needs of Parents and Students globally. If you have excellent programming skills and a passion for developing applications from scratch, we would like to meet you. Working at Early Steps Academy is one of the best opportunities to get first-hand experience in an early-stage startup, explore different domains, and achieve your career goals.
Qualifications:
- A minimum of 3 years of relevant experience.
- Strong programming skills in Javascript/Typescript with Object-oriented design.
- Hands-on expertise in building reusable components and independently publishable packages.
- Strong experience in HTML, Angular(2+)/React, ExpressJS, MongoDB, NodeJS, and CSS frameworks.
- Practitioner of IaC (AWS), CI/CD, and Containerization(Docker).
- Accessibility, Server Side Rendering, Pre-rendering, Serverless, and Agile.
- Ability to adapt quickly to a new direction.
• Collaborate with stakeholders to plan, design, develop, test, and maintain applications.
• Provide technical assistance to teammates through coaching and mentorship.
• Maintain high standards of software quality within the team by establishing good coding practices and habits.
• To ensure that the development and unit testing is in accordance with established standards.
• Participate in reviews of solution designs and related code.
• Develop, refine, and tune integrations between applications.
• Analyze and resolve technical and application problems and identify opportunities for improvement.
• Package and support deployment of releases.
Required Skills
• Expert in HTML5, JavaScript, Typescript and CSS
• In-depth of knowledge of frameworks like Angular 5-6-7, jQuery
• UI toolkits like Kendo UI, Infragistics, JQuery UI
• Coding in Core JAVA/J2EE, Spring, REST, Hibernate, JDBC
• Strong SQL query writing and testing skills
• Object Oriented Programming (OOP) concepts
Highly Desired Skills
• Jasper Reports, i Report
• SOA, SOAP, XML, XSL, Webservices
Good to Have:
• OOD, UML Design
• Tomcat, SVN – open source technologies
• Knowledge of UX
• MS- SQL, My-SQL, Database Knowledge
• Design Patterns/concept
Excellent hands-on design, coding, testing methodologies, and debugging skills
Thorough knowledge of software development best practices, including coding standards, code reviews, source control management, build process, continuous integration, and continuous delivery
Good exposure to programming constructs and writing algorithms
Good architectural & design skills
Experience in understanding platforms & key AWS services like Elastic
We are looking for a lean MERN Stack developer who is specialized in developing JavaScript-based technologies i.e. MongoDB, ExpressJS, ReactJS, NodeJS. If you have that energy and passion to create impacts, we have the perfect job for you! Job has flexible or temporary work from home options.
Job Responsibilities-
- Requirement gathering, UML & Database modelling and documentation
- Building interactive consumer data from multiple systems and RESTfully abstract to the UI through a Node.js backend
- Defining code architecture decisions to support a high-performance and scalable product with a minimal footprint
- Address and improve any technical issues
- Collaborate well with engineers, researchers, and data implementation specialists to design and create advanced, elegant and efficient systems.
Requirements-
- BSc degree in Computer Science or similar relevant field
- Previous working experience as a MERN Stack Developer for 3+ years
- Experience with modern frameworks and design patterns
- In depth knowledge of NodeJS, ExpressJS or Restify
- Experience of implementing applications using Angular or React
- Experience for creating front end applications using HTML5, CSS3 Angular, LESS/SASS
- Hands on experience with JavaScript Development on both client and server-side
- Knowledge of Functional Testing regarding Unit Testing, Integration Testing & End-to-End Testing is required
- Strong knowledge of Testing tools is required with subject to Jest and Enzyme, React Testing Library, Puppeteer (or PhantomJS, Nightmare or Headless Chrome) and Selenium WebDriver
- Rest API development, documentation and testing using tools like Postman
Knowledge of the following will be considered as an advantage-
- Requirements gathering, modeling, documentation and project management using Visual-paradigm.com
- Javascript based workflow engines and Flow-Based Programming
- Consumer Web Development Experience for High-Traffic, Public Facing web applications,
- Experience with cloud technologies
- Creating secure RESTful-based web services in XML and JSON, JavaScript, JQuery,
- Continuous integration (Jenkins/Hudson) and version control (SVN, Git).
- Converting UI and website designs (.psd, .xd, etc) into react components using Storybook.js and creating test cases with scripts; including documentation and automated visual testing
- React with WordPress Headless CMS using frameworks like Frontity.org
- org for authorization and access control models
- io microfrontend’s architecture framework for highly modular fully flexible applications
- Speech Recognition , voice interface , and other AI functionility
- React native mobile, Electron desktop application conversion
- Heroku Pipelines, Heroku: Browser and UAT, Heroku CI, DevOps tools and processes.








