Core Product – Backend Engineer (Go)

We're looking for a mid-senior Backend Engineer with strong Go and PostgreSQL skills. You'll join an early-stage, venture-backed startup as one of its first backend hires. The company is building a TikTok-style endless scroll of user-generated hypercasual mini-games. Your job is to build the core services behind the game feed, user data and content delivery, and to shape the product's technical direction for years to come. This is a founding-level role with real ownership, for someone who wants to build from the ground up and not maintain someone else's system.

Details:

Location: Sofia, Bulgaria, on-site 5 days a week

Employment: Full-time (no contractor, consultant or B2B setups)

Level: Mid-Senior

Relocation: Supported for strong candidates (1–1.5 months' notice maximum)

What you'll do

Design and build the Go services that power the game feed, user data and content delivery

Own PostgreSQL schema design and query performance as the product scales

Own deployments and keep services reliable (Linux, Docker)

Set up observability (logging, metrics, tracing) from day one

Work on data pipelines and recommendation / feed-ranking logic

Design REST APIs for iOS and Android clients

Work closely with the founders on technical and product direction

Tech stack

Go, Fiber, PostgreSQL, Docker, Linux, REST APIs, data pipelines, recommendation systems

Requirements

3+ years of production Go experience, having shipped and maintained services under real traffic

Solid PostgreSQL experience beyond basic CRUD, including schema design and query optimisation

Hands-on experience with Linux and Docker, including owning deployments

Based in Sofia or willing to relocate there

Ready for full-time, 5-day on-site work

Nice to have

Experience with recommendation systems, feed ranking or ML-adjacent data pipelines

Background in hyper-casual gaming or rapid-prototyping environments

Experience designing APIs for mobile clients

A startup or founder-led mindset, comfortable with speed and ambiguity

Hiring process

Online interview to discuss your experience and mutual fit

In-person technical challenge and interview at the Sofia office