Lead QA Engineer — Mobile & Backend, Sofia

This is a role that TechTree is recruiting for on behalf of one of our clients.

TechTree is an AI-driven recruitment platform working with high-growth companies.

When you apply, our AI Agent matches you not just to this role, but to other relevant opportunities across our network, so one application can unlock multiple roles.

Lead QA Engineer — own quality across iOS, Android and the Go backend. Sofia, in-office.

Our client runs a TikTok-style mobile feed where every item is a short, AI-generated browser game that anyone can make from a prompt.

You'll be in the release path for every feature, every A/B variant and every fix — this isn't manual testing bolted onto the end of a sprint.

What You'll Do

→ Test and evaluate every feature and both A/B variants before release

→ Verify bug fixes before they're closed out and confirm new tracking events fire correctly

→ Smoke-test incident fixes so they can ship immediately

→ Work across iOS, Android and the Go backend as one connected system, not three silos

What We're Looking For

→ Strong QA background across mobile (iOS + Android) and backend systems

→ Comfortable reading code you didn't write, hands-on running test suites (not just writing test plans)

→ Fluent with test runners, bug trackers, CI and event-verification tooling by name

Up to €70,000. Full-time, in person in Sofia.

What is TechTree?

TechTree combines AI agents with a human support team to give candidates a better, more transparent hiring experience.

Our AI Agent gets to know your background, experience, and what you're optimising for. It continuously matches you to live roles across our network where there's genuine alignment, not just keyword overlap.

Our Human Team is there to support you through the process — answering questions, adding context, and making sure you're never left guessing or ghosted.

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