About the Role
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We're looking for a Principal Server Engineer to own the backend systems powering our live games - services currently supporting 1M+ DAU. You'll be responsible for performance, scalability, and reliability at the core of our infrastructure, working closely with the engineering team on everything from schema design to incident response.
Experience: 8+ years

Nice to Have

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- CI/CD and DevOps experience (GitHub Actions, GitLab CI) plus monitoring/alerting (Prometheus, Datadog)

- Strong grasp of networking protocols — WebSockets, gRPC/HTTP2, UDP/TCP tuning for low-latency real-time systems

Requirements

Responsibilities

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- Design, build, and maintain Go/Python backend services for live, high-traffic game titles

- Own database schema design and query performance across PostgreSQL systems

- Drive horizontal scaling strategy - optimizing CPU/memory footprint and reducing lock contention over vertical scaling

- Profile and resolve memory leaks, CPU spikes, and deadlocks in production

- Lead root-cause investigations for performance issues and outages, from detection through resolution

- Architect and maintain in-memory caching/state layers (Redis/KeyDB/Memcached)

- Design and run load tests to surface breaking points ahead of release

Requirements

Crucial

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- Deep Go & Python expertise — language internals, execution models,



and performance tuning (goroutine management, GC tuning, zero-allocation techniques)

- Strong PostgreSQL fluency — scalable schema design, query plan analysis, index strategy optimization, with real examples of resolving bottlenecks via data layout or query architecture changes

- Proven experience scaling systems supporting 350k+ DAU, with a horizontal-scaling-first philosophy (efficient serialization/deserialization via Protobuf/MsgPack, reduced lock contention)

- Hands-on profiling experience — identifying and resolving memory leaks, CPU spikes, and deadlocks

- At least 2 concrete examples of complex production performance issues or outages, including root cause analysis and resolution methodology

- At least 2 released production projects as a core backend engineer handling live traffic xqbhyrx

Important

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- Hands-on experience with Redis, KeyDB, or Memcached — caching, rate-limiting, state management, including cache stampede mitigation, serialization overhead, and eviction policy design

- Solid TDD/BDD judgment and practical load-testing experience (e.g., Artillery)

- Practical experience with the Nakama framework — custom Go/Lua modules, matchmakers, storage engine, real-time multiplayer sockets

- Practical GCP/Google App Engine experience — deploying, monitoring, and scaling serverless/container services

Benefits

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- Market competitive, tax-free USD salaries

- Paid Time Off

- Annual Performance Reviews

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📌 Principal Server Engineer (España)
🏢 UserWise Services
📍 España