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