Senior Full-Stack Engineer

9 hours ago

Belgrade, Central Serbia ⚡️ staffi Full time 50,000 - 120,000 per year

Staffi is hiring a
Senior Full Stack Engineer for ArtWorkout

ArtWorkout
is a mobile app that teaches users pencil drawing and helps to build creativity with fun. With over 1 million monthly active users, 2000+ lessons, and a hybrid monetization model (subscription + ads), we're scaling quickly. Having our first product historically on iOS, we recently launched on Android and are expanding our team. We ship fast, measure everything, and keep quality high with automation.

We're hiring a
Senior Full-Stack Engineer
to deliver end-to-end product features and internal tools across our TypeScript stack. You'll build new services, extend existing systems, raise reliability, and drive measurable gains in UX and business metrics.

What you'll do:

Design, build, and ship features end-to-end in (web) and (backend).

Create new standalone services/projects and improve existing ones (user-facing and internal tools).

Analyze data and optimize PostgreSQL/Redis/MongoDB (schemas, indexes, transactions, isolation levels, partitioning/sharding, migrations).

Build real-time apps (WebSockets/ProtoBuf) with robust caching layers (DB/Redis/HTTP).

Write and maintain automated tests (unit/integration/e2e with Jest and Playwright/Cypress); make code testable by default.

Run CI/CD (e.g., GitHub Actions): build, lint, test, deploy, rollback, and canary releases.

Instrumental systems with OpenTelemetry; set up Prometheus/Grafana dashboards/alerts; maintain centralized logs/traces.

Use feature flags (e.g., GrowthBook) to run safe experiments and A/B tests as a routine practice.

Review code, improve developer experience, document APIs (OpenAPI), and raise the quality bar.

Participate in production (on a sane, sustainable rotation basis) and optimize performance/cost.

Must-haves:

5+ years professional TypeScript/JavaScript.

Strong Linux/Bash skills. Backend: NestJS, ; PostgreSQL, Redis, MongoDB (schema design, indexing, transactions & isolation, EXPLAIN/ANALYZE, partitioning/sharding, migration strategies).

Caching expertise: key design, TTL/invalidations, write-through/write-back; DB/Redis/HTTP caching.

Networking & integrations: REST, WebSockets, Protocol Buffers; real-time development experience.

Containerization: Docker (multi-stage builds, image optimization) and docker-compose.

Frontend: React, , Tailwind CSS, Webpack.

Testing: unit/integration/e2e (Jest, Playwright/Cypress) and writing testable code.

Quality practices: code reviews, ESLint, strict TypeScript, Prettier, API contracts (OpenAPI). Able to set up CI/CD independently (e.g., GitHub Actions): build/test/lint/deploy, rollbacks, canaries.

Monitoring: OpenTelemetry; Prometheus/Grafana dashboards & alerts; centralized logging and tracing. Feature flags and A/B testing as standard delivery (GrowthBook or similar). Clear written English for docs and PR requests.

Why join us:

A product that boosts creativity, learning, and well-being.

Fast shipping with rigorous quality discipline.

Autonomy, ownership, and a real say in architecture and standards.

Fully remote team with pragmatic, async processes.

Hiring process:


Apply here or via

15/30-minute interview with a recruiter.

Test assignment with dev-related questions.

Technical interview: stack, protocols, constraints, code.

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