# Principal Server Engineer

> UserWise Services · Lahore, Pakistan · Full-time · Posted 2026-09-07

**Workplace:** on_site

**Department:** Engineering

## Description

### About the Role

We're looking for a Principal Server Engineer to own the backend systems powering our live games - services currently supporting 350k+ 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**

-   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

-   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

-   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

Important

-   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

-   Market competitive, tax-free USD salaries
-   Private Health Insurance
-   Paid Time Off
-   Performance Bonus
-   Annual Performance Reviews

## Apply

[Apply at UserWise Services](https://apply.workable.com/userwise-services/j/DA6A3F2783/apply)

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