Core Product – Backend Engineer (Go)
Bulgaria · Posted last week
- Location
- Sofia, Bulgaria
- Work mode
- On-site
- Employment type
- Full-time
- Level
- Mid-Senior Level
- Compensation
- €80,000 – €90,000 (Estimated range — negotiable)
Work eligibility: This role is based in the EU. Candidates need EU work authorization (citizenship, permanent residency, or a valid work permit) — visa sponsorship is not offered for this role.
The opportunity
This client is building a scrollable feed of hypercasual games you play instantly, with no downloads. Type a prompt, get a playable game in seconds, and ship it to the feed. The platform sees millions of gameplays a week and has tens of thousands of creators. It is backed by Drive Capital, LAUNCHub Ventures and Inovo, and we are building the core engineering team in Sofia.
The role
You will be one of the first backend engineers on the team. What you build in your first six months shapes the product for years.
What you'll do
Services: Go services on Fiber powering the game feed, user data and content delivery
Ranking: Recommendation and feed ranking systems built on real behavioural data (view events, retention signals, engagement metrics)
Data: PostgreSQL schema design and query optimisation at scale
Infrastructure: Docker-based deployments on Linux
APIs: API design for iOS and Android clients
Pipelines: Data pipelines that turn raw events into actionable signals
Apply if you have:
3+ years of production Go experience, with services you have shipped and maintained under real traffic
Strong fundamentals in concurrency, networking, SQL and systems thinking
Comfort with Linux and Docker, and ownership of your own deployments
Solid PostgreSQL experience beyond basic CRUD
You care about observability: logging, metrics and tracing are not afterthoughts
Bonus: experience with recommendation systems, data pipelines, or anything ML-adjacent.
About this client
Early-stage, with real funding and real users. Not a slide deck company.
Tiny team, massive ownership. No layers of middle management between you and impact.
Sofia office: we build together, in person.
Competitive compensation, discussed during the process.
Process
Application and recruiter screening
Online interview to get to know each other and talk through your experience
In-person technical challenge and interview at our Sofia office
Interview process: Online interview to discuss experience and mutual fit → In-person technical challenge and interview at the Sofia office