Lead / Principal Full Stack Engineer

Fountane Archipelago  ·  Island Role

A Little Bit About the Role

We are looking for a Senior Product Engineer (L3) who thrives in complexity. Most engineers build on blank canvases — you build on someone else’s mess and leave it better than you found it.

The majority of your work at L3 will be on existing, live codebases — disorganised, partially documented, built by multiple teams over multiple years. Your job is to enter those systems, understand them before touching them, extend and clean them without breaking what works, and progressively bring them up to a standard where AI tooling can accelerate further development. This is the core of what L3 does at Fountane. If you have only built greenfield projects, this role will be hard.

You are expected to be genuinely full stack: comfortable owning web applications and mobile apps, the frontend, backend, database, state management, and API integration layer — without needing to hand off to a specialist.

You will work closely with the Concept Engineer on your Island — translating their prototypes into production architecture, raising technical blockers early, and keeping the sprint honest. You will also review code, mentor junior engineers, respond to production incidents, and contribute to the network’s shared knowledge base.

All of this is done primarily with Cursor and Claude as your execution and reasoning tools. AI-assisted engineering is not a feature of this role — it is the method.

AI-First Engineering Expectation

Cursor and Claude are your primary tools — not supplements. Engineers at L3 who are not using AI at the codebase level are not operating at this level.

At L3, AI-assisted engineering means:

• Loading full codebase context into Cursor before writing a single line — understanding the system before touching it.
• Writing scoped, precise refactor prompts that isolate changes to one concern at a time.
• Using Cursor to generate tests that document existing behaviour before any restructuring begins.
• Using Claude for architecture reasoning, decision documentation, and translating CE briefs into structured technical plans.
• Producing inline documentation and decision records as part of the AI-assisted workflow — not as an afterthought.
• Sharing effective prompt patterns and Cursor discoveries with the broader Fountane network — kept to yourself, they are a missed contribution.

Key Responsibilities

Legacy Codebase Refactoring & the Cleaning Phase

This is the primary L3 engagement type at Fountane. You will be handed existing, partially documented codebases — built by previous teams, often without tests, with inconsistent patterns — and your job is to refactor them into a clean, AI-promptable state without losing existing functionality. You use Cursor’s codebase context window to navigate safely, write characterisation tests before touching anything, and make changes in small, reviewable increments. The standard is: every module you leave should be easier to extend by AI tooling than when you found it.

Full Stack Development — Web & Mobile

Build and own the full application layer: React / Next.js web frontends, React Native or Flutter mobile apps, Node.js / Python backends, and relational and non-relational databases. You should be able to pick up web or mobile on any engagement without needing a handoff. Schema design, data modelling, and state architecture are yours to own — including diagnosing and fixing broken or leaking state in existing frontends.

Third-Party API Integrations

Integrate complex third-party services — payments (Stripe), communications (Twilio), auth (Auth0), and others — reliably and without creating brittle dependencies. Own the integration layer end to end: error handling, retries, failure modes, and documentation. If a third-party integration is flaky in production, that is your problem to own.

CE Collaboration & Sprint Integrity

Work directly with the Concept Engineer to translate prototypes into buildable technical plans. Review CE briefs before the sprint starts — if the scope is technically unrealistic, the time to say so is before work begins, not on demo day. Raise blockers against acceptance criteria proactively. You are the technical check on what the CE promises the client.

Security Awareness

Write code that does not require the Lead to security-audit every line. This means: input validation by default, no hardcoded secrets, correct auth scoping, safe handling of user data, and awareness of common vulnerabilities (injection, broken auth, insecure direct object references) in the context of the stacks you work in. You are not the security architect — the Lead owns that — but you are expected to produce code that does not introduce obvious vulnerabilities.

Production Incident Response

When something breaks in production, you are on it. Diagnose the issue, apply a safe fix or rollback, document what happened and why, and hand a clear summary to the Lead for the client post-mortem. Speed matters, but a bad fix that causes a second incident is worse than a slow fix that is correct. Response expectation: acknowledged within 1 hour, resolved or escalated with a clear status within 4 hours.

Codebase Navigation & Safe Refactoring

On all engagements — not just Cleaning Phase work — keep changes small, focused, and reviewable. One type of change per commit. Write tests that document existing behaviour before restructuring. Leave every module easier to understand than when you found it.

Code Review

Review pull requests from L1 and L2 engineers with specific, actionable feedback — not rubber-stamp approvals. A good code review at L3 leaves the author understanding what to do differently next time, not just what to fix now. Review weekly; do not let PRs age.

Mentoring

Review junior engineers’ code weekly with specific, useful feedback — this is distinct from quality-gate code review. The goal here is teaching, not gatekeeping. Run monthly pairing sessions to help them grow. The measure of good mentoring is whether they are becoming more capable and less dependent on you over time.

Documentation

Write short decision records when you make significant technical choices. Leave every module you touch easier to understand than when you found it. Treat documentation as part of the engineering work, not a separate task you do at the end.

Qualifications

• 5+ years of experience as a software engineer, with a strong track record on real production codebases you did not build from scratch — incomplete documentation, inconsistent patterns, other people’s decisions. If your experience is primarily greenfield, this role will be a difficult fit.
• Genuinely full stack across web and mobile: proficient in React / Next.js and at least one of React Native or Flutter, Node.js or Python on the backend, and comfortable with both relational and non-relational databases including schema design.
• Hands-on, daily Cursor and Claude usage at the codebase level. You should be able to describe concretely how you use AI in your engineering workflow — not in general terms.
• Experience integrating complex third-party APIs in production environments — not just following a quickstart guide. You should be able to describe an integration that failed in production and what you did about it.
• Solid security awareness for the stacks you work in: input validation, auth scoping, safe data handling. You do not need a security specialism, but you should not be writing code that introduces obvious vulnerabilities.
• Has conducted meaningful code reviews that improved the code and the author, not just approved the PR.
• Has coached or mentored junior engineers before, and done it well.
• Comfortable with production incident response — diagnosing issues under pressure, applying safe fixes, and communicating clearly to a Lead or client about what happened.
• Treats documentation as part of the job, not an afterthought.
• Bachelor’s or Master’s in Computer Science or a related field, or equivalent experience.

About Fountane

Fountane is a technology ventures lab - one part product studio, one part startup engine. We build high-quality software and AI products for clients ranging from fast-moving startups to large enterprises, and we co-build and invest in new companies when we see the right opportunity.

Founded in 2017 and headquartered in Minneapolis, we have grown to 60+ people across four continents and were recognised as one of America’s fastest-growing companies, ranking No. 699 on the Inc. 5000 with 595% three-year growth.

We are radically open-minded, serious about craft, and direct about expectations. If you want to do meaningful work without politics, this is the place.

Job Description: Java Developer

Position: Java Developer

Experience: 5 to 7 Years

Notice Period: Immediate Joiner

Key Responsibilities

• Design, develop, and maintain scalable, high-performance Java applications.
• Work with Core Java and Advanced Java concepts to build reliable backend solutions.
• Develop and deploy applications using Spring Boot framework.
• Design and implement RESTful Microservices with best practices in scalability and performance.
• Collaborate with cross-functional teams in an Agile/Scrum environment.
• Manage code versions effectively using Git/GitHub.
• Ensure code quality by integrating and analyzing with SonarQube.
• Participate in code reviews, sprint planning, and daily stand-ups.
• Troubleshoot production issues and optimize system performance.

Required Skills

• Strong proficiency in Core Java (OOPs, Collections, Multithreading, Exception Handling).
• Hands-on experience in Advanced Java (JDBC, Servlets, JSP, JPA/Hibernate).
• Proven experience with Spring Boot for application development.
• Knowledge and experience in Microservices Architecture.
• Familiarity with REST APIs, JSON, and Web Services.
• Proficient in Git/GitHub for version control and collaboration.
• Experience with Sonar Qube for code quality and security checks.
• Good understanding of Agile/Scrum methodologies.
• Strong problem-solving and debugging skills.

Nice-to-Have

• Experience with CI/CD pipelines (Jenkins, GitHub Actions, or similar).
• Familiarity with Docker/Kubernetes for containerized deployments.
• Basic knowledge of cloud platforms (AWS, Azure, GCP).

Job Description:

• 2 – 4 years of hands-on experience as a Developer in financial services
• Experience with C#/.NET
• Experience with JavaScript/TypeScript, ReactJS, and AWS Cloud technologies is a plus
• Experience with databases such as MSSQL and MongoDB is a plus
• Familiarity with concepts such as microservices, API, TDD, unit testing, and SDLC
• Knowledge of Stock Loan, Collateral margining, Swaps would be a great advantage
• Strong analytical and problem-solving skills, with the ability to think critically
• Strong written and verbal communication skills
• Experience in stakeholder management across both IT and business sectors

At BigThinkCode, our technology solves complex problems. We are looking for full-stack engineer to join our Microsoft capability teams at Chennai.

Our ideal candidate will have expert knowledge of software development processes, programming and problem-solving skills. This is an opportunity to join a growing team and make a substantial impact at BigThinkCode.

Please see below our job description, if interested apply / reply by sharing your profile to discuss.

Company: BigThinkCode Technologies

URL: https://www.bigthinkcode.com/

Work location: Chennai (work from office)

Experience: 3 – 4 years

Joining Time: Immediate-3 weeks

Programming Skills Required:

• Proficiency in C#, .NET Core, MVC
• Familiar with Data Structures & Algorithms, Object Oriented Programming basics.
• Hands on Problem Solving and Debugging skills.

Framework Required:

• EF Core
• Experience in OOJS, JavaScript, HTML, CSS, and at least one modern frontend framework like React/ Angular/ Vue.

Deployment And Devops Basics Required:

• Cloud (AWS), Docker
• Good to Have: Azure DevOps

Database Required:

• Relational (SQL Server), NoSQL, ORMs

Benefits

• Medical cover for employee and eligible dependents.
• Tax beneficial salary structure.
• Comprehensive leave policy
• Competency development training programs.

• 2 years of strong development background building complex applications.
• Proficiency in JavaScript, including DOM manipulation and the JavaScript object model.
• Experience building applications using NodeJS and frameworks such as Express.
• Thorough understanding of React.js and NodeJS including its core principles.
• Ability to understand business requirements and translate them into technical requirements.
• Familiarity with code versioning tools (such as Git, SVN, and Mercurial).
• Understanding the nature of asynchronous programming and its quirks and workarounds
• Strong experience with MongoDB, Postgres
• Developing new user-facing features using React.js
• Thorough understanding of React.js & popular Workflows (such as Flux or Redux)
• Building reusable components and front-end libraries for future use

Interview Kickstart is one of the leading platforms helping Software Engineers prepare for tough technical interviews. Over the last 5 years we have helped over 3000 engineers Nail the toughest technical interviews on the planet. We are successful, profitable, and have a vision of building the world's largest Career Upleveling platform. 

We are looking for top-notch, motivated engineers to come join our growing team at IK. 

Who you are

• You have 2 - 7 years experience. 
• You love the buzz of a highly productive and fast moving team. 
• You have a github profile that you want to show off. 
• You love coding and look forward to taking on complex, abstract features. 
• You don't care about front end, backend kinda titles. You like working anywhere in the "stack". 
• You are looking to grow fast with a company that's on a rapid growth path.

What will excite us

• Previous startup experience or experience being part of early teams.
• Experience with the Django & Python universe. 
• Experience with both Relational and NoSQL DBs. 
• Competitive Programming experience. 
• A keen desire to problem solve, brainstorm and debate during the interview. 

What will excite you

• Complete ownership
• Experiment, fail and learn.
• High pedigree, high caliber team. 
• Contribute to every area of our business. Have a real impact with your work. 
• Top of the line compensation.

Our interview process is designed to help you show the best version of yourself. Once your candidature is finalized, we'll send you a short video explaining the interview process.

Look forward to speaking with you soon!