Hire a senior NestJS developer who has shipped at unicorn scale
Built payment orchestration at bolttech — $1B+ unicorn, 40+ providers, 99.9% uptime, zero post-launch critical bugs. Fixed monthly price.
Who this is for
Fintech or SaaS engineering manager on a TypeScript-first backend that chose NestJS for structure and dependency injection.
The pain today
- Team shipped the MVP on NestJS, now cannot agree on module boundaries.
- Microservice transport (TCP, Redis, Kafka, NATS) chosen without a plan.
- Auth is spread across six modules and a middleware stack.
- TypeORM or Prisma decision was made in a Slack thread and never revisited.
The outcome you get
- A senior NestJS engineer with $1B+ unicorn production experience.
- Module boundaries drawn with domain-driven design.
- A microservice transport decision written down and applied.
- Auth (JWT, session, OAuth, Passport) consolidated into one pattern.
NestJS at bolttech — the proof point
bolttech is a $1B+ fintech unicorn backed by Tokio Marine and MetLife Next Gen Ventures. I led the Payment Service on NestJS plus React plus MongoDB plus Redis plus TypeScript, integrating 40+ payment providers across Asia and Europe. The service ran at 99.9% uptime, supported 15+ new international markets, and shipped with zero post-launch critical bugs. That is real NestJS under real load — not a side project. Module architecture, microservice transport, guard and interceptor discipline, and TypeORM patterns in that codebase shape how I design new NestJS apps today.
Module boundaries and domain-driven design
NestJS rewards careful module boundaries and punishes sloppy ones. A typical team ships a flat module structure (UsersModule, AuthModule, EmailModule) that works until feature count crosses about 15. Above that the right move is domain modules (PaymentsModule with its own controllers, services, entities, guards, events) with shared infrastructure modules (LoggerModule, DatabaseModule, QueueModule). Dependency injection then stays tidy and microservice extraction becomes cheap. The audit during discovery rewrites the module graph before new features land.
Microservices, monorepo, transport
NestJS microservices are a real option — TCP, Redis, Kafka, NATS, gRPC. But microservices are not free. At bolttech the right split was narrow: Payment Service and a handful of adjacent services; everything else stayed in the monolith. Before splitting, the audit measures where the deployment contention actually is, where the team boundaries are, and where the data lives. Most startups should stay on a modular monolith and extract only the bottleneck.
Pricing and engagement
Applications subscription at $3,499 per month flat. 2 to 4 day delivery cycles. Daily async updates. Weekly 30-minute call. Fits inside an existing team (pairing, code review, PR ownership) or solo on a greenfield service. 14-day money-back inside the first two weeks. After that, cancel anytime month to month. Work Made for Hire — every commit is yours from day one.
Recent proof
A comparable engagement, delivered and documented.
Unified payment orchestration across Asia and Europe
Delivered the payment orchestration platform at bolttech, a $1B+ unicorn, with 40+ integrations across multiple regions.
Frequently asked questions
The questions prospects ask before they book.
- TypeORM, Prisma, or Mongoose?
- Prisma on new Postgres projects. Mongoose on Mongo projects (bolttech was Mongoose). TypeORM only when maintaining an existing codebase that already uses it — I do not introduce TypeORM to greenfield work.
- Do you handle microservice architecture?
- Yes. bolttech was a NestJS microservice environment. I make the extraction decision based on deployment and data boundaries, not on buzzword appeal.
- Auth — Passport, custom JWT, or third-party?
- Passport for the heavy lifting, custom guards for business rules, JWT or session based on the app. Clerk or Auth0 when the team prefers to buy rather than build — I wire the integration.
- Queues and workers?
- BullMQ on Redis by default. For higher throughput or exactly-once semantics I move to Kafka or SQS depending on the cloud.
- How much of my NestJS team do you want to join?
- I work as an additional senior engineer inside the team — branch conventions, PR templates, CI, Linear or Jira tickets. I do not force my process on the team.
Ready to start?
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