Senior Backend Engineer
About the role
You'll own the backend for a live mobile F2P game and the AI agentic platform that powers how we operate it. Feature releases, live ops, monetization, analytics pipeline, reliability. Senior IC with real ownership from day one and a path to platform / tech lead as we scale. You work with our production systems serving real players and real revenue. The primary stack is TypeScript/Node.js (Fastify) with MongoDB, ClickHouse, Redis, and RabbitMQ. The AI tooling layer is Go. We use AI heavily as part of how we work. Claude agents write production code alongside us. If you're a strong backend engineer who's comfortable with that mode, you'll fit right in.
What you'll work on
Game backend: API server, realtime (Socket.io), analytics ingestion, cron jobs â all in one TypeScript monorepo
AI agent platform: MCP server in Go bridging LLMs with our databases and third-party APIs
External integrations: Slack, Discord, GitLab, Meta Ads, Google Ads, AppLovin, Apple App Store
LLM routing: Anthropic, OpenAI, DashScope
Production support for our live PvP mobile game
Required
5+ years backend engineering
TypeScript/Node.js at production scale. you've shipped & operated production services at scale
MongoDB in production: replica sets, aggregation pipelines, transaction patterns
ClickHouse: analytical queries, materialized views, joins at scale
Kubernetes in production (we run k3s on GCP, deploy via Helmfile + GitLab CI)
Strongly preferred
Go: comfortable reading and extending stdlib net/http services. Our MCP server is Go
LLM API integrations (Anthropic, OpenAI)
Mobile gaming backend: live ops, A/B test infrastructure, IAP validation
RabbitMQ or similar async messaging
OAuth/JWT/RBAC
Nice to have
MCP (Model Context Protocol) â we use mark3labs/mcp-go
F2P economy design / monetization backend experience
Apple/Google Play Store API
Agent systems or autonomous workflow background