Engineering · Mid-Senior
Backend Engineer
Own the services behind a live multi-tenant platform: NestJS APIs, an assessment scoring engine, and the data model everything stands on.
The role
You'll own backend services for a live behavioural-science platform: NestJS APIs, a scoring engine that turns structured assessments into results people act on, and multi-tenant foundations that have to hold as the client's business grows. The systems are in production with real users — this is stewardship and evolution of a living codebase, not greenfield toys.
Role details
What you'll do
- Design and build NestJS services: REST APIs, background jobs, integrations, and the scoring engine
- Own the data model — PostgreSQL schema design, migrations, and query performance in a multi-tenant world
- Keep tenancy boundaries, authorization, and data isolation airtight as features grow
- Ship in weekly sprints with tests where they count: business logic, scoring, auth, payments
- Review pull requests and mentor the junior backend engineer
What you bring
- 4+ years building production backend services in TypeScript/Node.js, with real NestJS experience
- Strong PostgreSQL: schema design, indexes, transactions, and the instinct for when the ORM is lying to you
- You've built or maintained multi-tenant systems and can talk concretely about isolation trade-offs
- Comfort owning services in production: monitoring, debugging live issues, writing runbooks
- Strong written communication — decisions here get written down
Nice to have
- Experience with scoring/rules engines, assessment platforms, or similar domain-logic-heavy systems
- Redis, queues, and caching patterns under real load
- Exposure to LLM-backed features from the service side (prompt orchestration, evals, cost control)
You'll work with
What you get
The deal, plainly
Senior-led delivery: your work is reviewed by people who've shipped production systems, and you see how they think
An AI-native workflow — modern AI tooling is standard practice here, with human review as the quality bar
Real products in production: client work that ships weekly and gets used, not internal demos
Async-first, writing-heavy culture on IST, with deliberate US/EU overlap instead of late-night calls
Competitive compensation, reviewed on outcomes
How we hire
Four steps, no gauntlet
Apply
Send the form on the role page — the cover note and links matter far more than a perfectly formatted CV.
Intro call (30 min)
A real conversation about the role, your work, and whether the fit is mutual. No trick questions.
Practical round
A scoped, role-relevant exercise or portfolio deep-dive — designed to respect your time, not a weekend of free work.
Founder conversation & offer
You meet the person you'll actually work with. If it's a yes on both sides, we move fast.
Apply
Apply — Backend Engineer (Mid-Senior)
The cover note and links matter far more than a perfectly formatted CV. We read every application.