Senior Backend Engineer (Node.js)
Senior backend engineer building the core of an online slot-gaming platform: new Nest.js/TypeScript services handling spins, transactions, real-time promos and ClickHouse analytics, with a focus on correctness, low p95/p99, Postgres/Redis tuning and Kubernetes. Remote in Europe or from the Barcelona office.
- Compensation
- Not disclosed
- Location
- Remote
- Work setup
- Remote
- Seniority
- Senior
- Employment
- Full time
- Experience
- 5+ years
- Category
- Backend
- Posted
Skills
Must have
- 5+ years of production Node.js and TypeScript, with solid hands-on Nest.js experience
- Experience designing services from scratch with clean, maintainable architecture
- Experience with correctness-critical systems (payments, wallets, ledgers): transactions, locking, idempotency
- Deep Postgres knowledge: indexes, query plans, isolation levels, autovacuum tuning, live migrations
- Redis in production beyond caching (leaderboards, rate limiting, distributed locks)
- Confidence running and debugging services on Kubernetes
Nice to have
- Migrated a live system to a new architecture
- Built GraphQL APIs
- Worked with ClickHouse or another columnar database
- Built event-driven systems with Kafka, NATS or similar
- Set up observability with OpenTelemetry, plus Grafana dashboards and alerts
Full description
About us
We’re just 1 year old, already 40 people, and growing quickly. Our slot games are played by more than 1 million people every month, and this is only the beginning.
What we do
Each spin passes through our backend: the game math decides the outcome, a transaction moves the balance, promo features kick in, and analytics records it. It all has to be correct, fast and ready for traffic that keeps growing, so we keep p95 low and stable under any load.
What you’ll work on
- The rebuild: design new Nest.js services from scratch, with no legacy to patch, and move traffic over without downtime
- Transactions: idempotent, consistent operations that stay safe under heavy concurrency, so no spin is lost or counted twice
- Integrations: third-party APIs from operators and aggregators, built so outside failures never break a spin
- Promo features: real-time tournaments and leaderboards for thousands of players at once
- Analytics: event pipelines into ClickHouse
- Performance: keep p95 and p99 low as traffic grows by profiling Node, tuning Postgres and Redis, and planning capacity on Kubernetes
- On-call: you own what you build, so it’s only fair to take part in our shared on-call rotation
What we’re looking for
- 5+ years of production Node.js and TypeScript, with solid hands-on Nest.js experience
- Experience designing services from scratch with clean, maintainable architecture
- Experience with systems where correctness matters (payments, wallets, ledgers): transactions, locking, idempotency
- Deep Postgres knowledge: indexes, query plans, isolation levels, autovacuum tuning, live migrations
- Redis in production beyond caching (leaderboards, rate limiting, distributed locks)
- Confidence running and debugging services on Kubernetes
It’s a plus if you’ve:
- Migrated a live system to a new architecture
- Built GraphQL APIs
- Worked with ClickHouse or another columnar database
- Built event-driven systems with Kafka, NATS or similar
- Set up observability with OpenTelemetry, plus Grafana dashboards and alerts
How we work with AI
We’re AI-first: AI is part of everything we do, from design to code review. A premium Claude subscription is on us, and we keep going deeper. What doesn’t change is ownership: AI writes the code, but people stand behind it.What we offer
- Competitive salary in USD
- 20 days of paid vacation, 15 sick days, and your birthday off
- Remote work or our office in Barcelona