Back-End Developer (.js / Node.js) — Strong Middle → Senior $$$$ Offline

We are building a new high-impact CRM platform operating in an extremely sensitive, high-security environment.

While the product itself is not a cybersecurity tool, it will handle confidential data and communications, requiring uncompromising discipline in secure development, and controlled access across every layer of the backend infrastructure.

The project follows a Spec-Driven Development (SDD) methodology — all functionality is defined, documented, and validated before implementation.

All code is preffered to be developed in LLM-assisted environments (e.g. Cursor, VS Code + Copilot) using Model Context Protocols (MCPs) to ensure rapid, accurate, and traceable delivery.

Our mission: high-velocity, high-quality, fully secure backend code within a tightly isolated development ecosystem.

✅ Core Requirements

• 4+ years of professional back-end development experience with Node.js / Nest.js (TypeScript preferred).
• Proven track record of building secure, scalable API-driven systems, microservices, and modular architectures from the ground up.
• Solid command of relational databases (PostgreSQL, MySQL) and ORM tools (Prisma, TypeORM).
• Proficiency in REST / GraphQL API design, integration, and testing.
• Experience with authentication, authorization, and access control mechanisms (JWT, OAuth2, RBAC).
• Confident in asynchronous processing, job queues, and event-driven systems.
• Working knowledge of Docker, containerized workflows, and basic CI/CD pipelines.
• Competence with testing frameworks (Jest, Mocha, Supertest) and maintaining reliable test coverage.
• Experience with Spec-Driven Development (SDD) — implementing precisely from specs and maintaining traceability across all tasks.
• Proficiency in LLM-assisted workflows (Cursor, Copilot, Claude, GPT, etc.) for coding, testing, and refactoring.
• Understanding of Model Context Protocols (MCPs) — and how they integrate with AI-assisted development environments.
• Solid grasp of secure SDLC principles:
  • Secrets & credential management
  • Encrypted data storage and transmission
  • Access control & privilege isolation
  • Secure CI/CD pipelines and deployments
  • Code audit & compliance readiness
• Highly self-managed and delivery-oriented mindset.

⚙️ Responsibilities 

• Implement and maintain secure, high-performance backend modules following detailed specs.
• Integrate APIs, data models, and services within the defined system architecture.
• Collaborate with analysts and QA to ensure every delivery meets spec and security standards.
• Use AI-assisted tools (Cursor, Copilot, MCPs) to improve speed, consistency, and maintainability.
• Participate in code reviews and contribute to continuous improvement of backend architecture.
• Maintain clear, versioned documentation aligned with SDD processes.

🧱 Nice to Have

• Experience in microservices, event-driven systems, or message queues (RabbitMQ, Kafka).
• Familiarity with DevOps tools (Docker Compose, GitHub Actions, Render, Vercel, etc.).
• Exposure to cryptography, secure APIs, or compliance-driven systems.
• Experience with high-load optimization or real-time data handling.
• Background in cybersecurity, penetration testing, or threat modeling.
• Mentorship or leadership experience within small distributed teams.