Senior Backend Engineer in Gdańsk

Agile Engine is an Inc. 5000 company that creates award-winning software for Fortune 500 brands and trailblazing startups across 17+ industries.

We rank among the leaders in areas like application development and AI/ML, and our people-first culture has earned us multiple Best Place to Work awards.

WHY JOIN US If you're looking for a place to grow, make an impact, and work with people who care, we'd love to meet you!

ABOUT THE ROLE We are looking for a

Senior Backend Engineer to build and scale the backend of a high-traffic gaming companion site.

The mandatory requirements are 5+ years of backend development with Type Script on Node. js, Postgre SQL or My SQL, Redis caching, REST and Graph QL APIs, daily use of AI coding tools, and an upper-intermediate English level.

WHAT YOU WILL DO - Build and maintain REST and Graph QL APIs in Type Script (Fastify, Hono) for user profiles, subscriptions and game data, including authentication, rate limits and typed contracts.

• Design schemas and write queries for Postgre SQL and My SQL (Prisma, Drizzle), including versioned game data, player builds and migrations on tables in live use.
• Run Click House analytics pipelines: request logs, materialized views, article and revenue metrics, and the queries behind dashboards.
• Own the cache layers end to end: Redis-compatible stores, query caching, tag-invalidated cache, HTTP headers and CDN purges.
• Build and run scheduled jobs and queue consumers (NATS) for game data sync, leaderboards, Meilisearch indexing, sitemaps, Stripe webhooks, payouts and data-deletion requests.
• Integrate third-party APIs (Stripe, Discord, Blizzard, IGDB, Steam, You Tube), handling retries, backoff and rate limits.
• Process game images into map tiles, sprite sheets and responsive image sizes.
• Keep responses lean for Remix and Next. js pages to improve time to first byte, Page Speed and SEO.
• Work with AI coding agents every day: direct them, review their output, and maintain the guardrails that make their changes safe to merge (tests, lint rules, build checks, agent instructions).
• Deploy through Docker, Git Hub Actions and Kubernetes.
• Support high-traffic game launches, including outside regular hours when needed.
• MUST HAVES -

5+ years of backend development with Type Script on Node. js.

• Strong command of

Type Script’s type system (generics, inference, discriminated unions, narrowing).

• Schema validation experience with

Zod or similar.

• Strong SQL skills in

Postgre SQL and/or My SQL : schema design, indexing, query plans, migrations on live data, transactions and locking.

• Experience running an analytical database at production volume ( Click House preferred; Big Query, Druid or similar also count ).

- Experience designing caching

Redis or a compatible store, invalidation strategies, HTTP cache headers, CDN behavior.

• Experience designing and consuming

REST and Graph QL APIs , including authentication and rate limiting.

• Experience with background jobs and message queues, including handling jobs that run twice or don’t run at all.
• Experience with high-volume, user-facing production applications.
• Experience taking a product from idea to production.
• Proficiency with agentic AI coding tools (Claude Code, Cursor or similar) : daily, hands-on use in a real codebase, and good judgment about when their output needs checking.
• Comfortable reading and changing React code when a feature reaches the frontend.
• Able to work well in a startup-style, fast-paced environment with changing priorities.
• Flexible about working hours: some game launches happen in the evening or on weekends and need coverage outside the standard 9-to-5.
• Passion for gaming.

NICE TO HAVES - Experience with Bun.

• Experience with any of the current stack: Remix, Next. js, Fastify, Hono, Prisma, Drizzle, Apollo Graph QL, Meilisearch, NATS, Ory, Stripe, Nx.
• shadcn/ui and Tailwind CSS.
• Strict lint setups (typescript-eslint strict Type Checked, custom lint rules, architecture boundaries).
• Docker, Kubernetes, Git Ops (Argo CD), Git Hub Actions, External Secrets.
• Payments and subscriptions (Stripe checkout, webhooks, promotion codes).
• Writing agent instructions, skills or custom tooling for AI coding agents.
• Experience building game tools, such as databases, interactive maps, calculators or planners.

PERKS AND BENEFITS -

Professional growth : Mentorship, Tech Talks, and personalized growth roadmaps.

Competitive compensation : USD-based pay with education, fitness, and team activity budgets.

Exciting projects : Modern solutions with Fortune 500 and top product companies.

Flextime : Flexible schedule with remote and office options.

Meet Our Recruitment Process Each step helps us understand your skills and overall fit.

If it’s a match, you’ll receive an offer.