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Senior Full Stack Engineer

SeniorEngineeringRemote / EuropeFilled

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.

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