AI-Driven Full-Stack Engineer for Gamification

First.ua; Polska; Hybrid; PLN 180,000 - 300,000; Full time

Job summary

First.ua is seeking a software engineer to build gamification features on an established iGaming platform. You will own technical plans, make decisions, and ensure quality across merges.

The role blends backend Node.js/TypeScript with Vue 3 UI work, and involves working with AI agents to write code. You will collaborate across repos, implement spec-driven development, write agent context docs, and maintain tests for critical paths, while focusing on robust, scalable game features and player

Qualifications

• 4+ years of commercial software development, including 3+ years of backend work in Node.js and TypeScript.
• 1+ year of daily agentic development with Claude Code or a similar tool on real projects: plan mode, subagents, parallel sessions in git worktrees.
• At least one spec-driven approach used on a real project (Superpowers, Spec Kit, OpenSpec, BMAD, Kiro or an in-house process).
• Ability to write and maintain agent context: AGENTS.md or CLAUDE.md, skills, rules, hooks, permissions.
• Solid Vue 3 (Composition API, Pinia). Gamification is player-facing work, so each engineer also builds the UI part of a feature.
• Hands-on MySQL, MongoDB, Redis and message queues (RabbitMQ or Bull).
• Experience with legacy code that has no tests: characterization tests, safe refactoring.
• Understanding of AI development risks: secrets and personal data in agent context, review of AI-written code.
• English at B2 (Upper-Intermediate) or higher.
• Ukranian or russian fluent speaking.

Responsibilities

• Turn product requirements from the product team into specs with acceptance criteria and keep the specs in the repository.
• Deliver each feature through spec, technical plan, task breakdown, implementation and verification. Keep the agent context for the gamification area current: AGENTS.md, CLAUDE.md, skills, slash commands, subagents, MCP.
• Cover critical paths with tests, including characterization tests around legacy code, so agents can verify their own work.
• Describe the contracts the features depend on (queues, APIs, shared tables) in a machine-readable format.
• Work within the team's quality gates: permissions, hooks, automatic lint, AI-assisted code review in GitLab CI.
• Review AI-written code to the same standard as human-written code. Keep secrets and personal data out of agent context.
• Work across several repositories together with the in-house development team.

Skills

4+ years dev

Claude Code experience

Spec-driven development

Agent context docs

Vue 3 experience

Databases & queues

Legacy code with no tests

AI risk awareness

English B2+

Ukrainian/Russian

Tools

Node.js

TypeScript

PHP CodeIgniter 3

Vue 3

MySQL

MongoDB

Redis

RabbitMQ

Bull

ClickHouse

PostgreSQL

Docker

GitLab CI

Claude Code

Cursor

MCP

Job description

First.ua is seeking a software engineer to build gamification features on an established iGaming platform. You will own technical plans, make decisions, and ensure quality across merges.

The role blends backend Node.js/TypeScript with Vue 3 UI work, and involves working with AI agents to write code. You will collaborate across repos, implement spec-driven development, write agent context docs, and maintain tests for critical paths, while focusing on robust, scalable game features and player