Location: On-site, Bengaluru, India,

Work Type: Full-time

Experience: 6 months to 2 years

Joining: Immediate About

UnclaimedX is a Bengaluru-based FinTech startup building digital inheritance infrastructure for India. Our consumer app, Pass Down, helps people securely store financial credentials and nominee details so their family never loses what belongs to them.

India has over ₹1.84 lakh crore in unclaimed financial assets sitting across banks, insurance companies, and government accounts. Families lose that money not because they are careless but because no one planned ahead. We are building the product that fixes that. The Role

We are seeking a motivated and detail-oriented Full Stack Developer to join our growing engineering team. The successful candidate will contribute to the development and maintenance of both server-side APIs and web-facing interfaces powering the Pass Down platform, working under the guidance of a Senior Backend and Security Engineer to deliver well-structured, production-grade backend services and frontend web experiences. This role offers exposure to security-conscious FinTech product development, AWS cloud infrastructure, and third-party service integration within a dynamic, fast-paced startup environment.

You will work day-to-day under our Head of Infrastructure & Security and directly with the founder on backend product decisions and integration requirements. Key Responsibilities

Contribute to the development and maintenance of RESTful APIs supporting core application functionality across authentication, user management, and data operations

Support the implementation of secure API logic for user authentication,



OTP verification, and session management workflows

Assist in the integration of third-party service

Support cloud storage and file management operations utilising AWS S3 and related services

Contribute to database schema design and query development under senior engineering guidance

Develop clean, well-tested backend code with comprehensive input validation, error handling, and edge case coverage

Contribute to API documentation and automated test coverage for all endpoints owned

Assist in diagnosing and resolving API integration issues in collaboration with the mobile engineering team

Adhere to existing backend architecture, coding conventions, and environment standards as defined by the senior engineering team Requirements

1-2 years of demonstrated experience in Node.js backend, Reactjs, AWS services like Lambda, RDS, S3 etc.

Working knowledge of RESTful API design and implementation: routing, controllers, middleware, and structured error handling

Demonstrated experience with at least one relational or document-oriented database (MySQL, PostgreSQL or MongoDB) in a production workplace

Demonstrated experience with standard authentication mechanisms including JWT and OTP verification workflows





Working understanding of backend security fundamentals: HTTPS enforcement, input validation, rate limiting, and secure data handling practices

Demonstrated experience integrating third-party APIs within a production backend system

Familiarity with environment configuration and secrets management practices

Working knowledge of at least one AWS service (S3, EC2, or Lambda) in a production or professional project context

Proficient use of version control systems, specifically Git, within collaborative development environments Good to Have

Exposure to AWS CloudHSM, KMS, or multi-region infrastructure

Awareness of data encryption concepts: independent implementation is not required

Experience diagnosing and resolving production-level backend incidents independently

Exposure to automated API testing frameworks What You Get

Structured mentorship and guidance from a Senior Backend and Security Engineer with 15 years of experience

Work directly under a founder with 13 years of startup experience to accelerate your professional growth.

Exposure to AWS cloud architecture, security-first engineering practices, and FinTech product development

Opportunity to contribute to backend infrastructure handling real, sensitive user data at production scale

Professional development opportunities within an early-stage, high-growth organisation Candidates are expected to possess a personal laptop suitable for Node.js development and AWS CLI tooling Interested candidates are invited to submit their resume to [email protected] with the subject line: Full Stack Developer: [Your Name]

📌 Full Stack Developer (Node.js + React) (Bengaluru)
🏢 Pass Down | UnClaimedX
📍 Bengaluru