About the Role

Our client is building a next-generation identity verification platform that serves over 7 million users globally. In a world full of bots, deepfakes, and fake accounts, this platform combines biometric tech, zero-knowledge cryptography, and blockchain infrastructure to help prove human uniqueness—privately and securely.

They’re now looking for a Senior Full-Stack Engineer to lead a major infrastructure overhaul. This includes migrating from SQL to NoSQL, refactoring services, and helping shape a modern, scalable architecture built for millions of users.

What You’ll Be Doing

• Architect and execute a large-scale database migration (MySQL → MongoDB)

• Redesign schemas, build migration pipelines, and optimize performance

• Refactor TypeORM-based data access layers while ensuring backward compatibility

• Migrate microservices to a containerized AWS ECS/Fargate environment

• Consolidate multiple codebases into a single monorepo (using pnpm/yarn workspaces)

• Build unified authentication and identity management across multiple frontends

• Develop robust testing strategies (unit, integration, end-to-end)

• Design rollback procedures and phased rollouts using feature flags

What We’re Looking For

• 5+ years of full-stack experience with expert-level TypeScript & Node.js

• Solid experience with TypeORM and optimizing complex SQL queries

• Hands-on experience migrating from SQL (MySQL/PostgreSQL) to NoSQL (MongoDB)

• Strong grasp of database design, indexing, and query performance

• Proficiency in Docker and AWS ECS (or Kubernetes)

• Strong knowledge of Express.js and building scalable RESTful APIs

• Solid frontend skills in Next.js, React, and modern CSS frameworks

• Experience managing monorepos and CI/CD workflows

• Bonus if you’ve worked on identity/authentication systems at scale

Nice to Have

• Knowledge of Web3 technologies and wallet integrations

• Experience with multi-tenant systems and data isolation

• Familiarity with event-driven architectures and messaging systems

• Background in KYC, decentralized ID, or credential systems

• Excellent communication skills and the ability to work independently

Tech Stack Overview

• Backend: TypeScript, Node.js, Express.js, Mongoose, TypeORM

• Databases: MongoDB, Firebase, Redis

• Infrastructure: AWS ECS Fargate, Docker, Cloudflare, Vercel

• Frontend: Next.js, React, React Native, Tailwind CSS, Chakra UI

• Auth: Firebase Auth, JWT, OAuth 2.0, Web3 wallets

• Blockchain: ethers.js, Solana web3.js, wagmi

• DevOps: GitHub Actions, pnpm, dotenv-vault

• Testing: Jest, React Testing Library

• Security: ZK proofs, BBS+ signatures, encryption

• Monitoring: Sentry, CloudWatch

Why You Might Love It

• You’ll be working on a problem that actually matters: keeping humanity human online.

• The scale is real: 7M+ users and growing.

• The tech is cutting-edge across Web2, Web3, and AI.

• You’ll have ownership, autonomy, and trust to do your best work.