AI-Native Fullstack Engineer, Go, React

COLIBRIX ONE

Engineer working with AI coding agents to drive product from specs to production. Join a fintech company innovating advanced payment technologies across Europe.

Posted 7/21/2026full-timeRemote • 🇵🇱 PolandMid-LevelSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates strong Go backend engineering skills, with a focus on services, APIs, and concurrency, while ensuring code quality through review and acceptance processes. Proficient in working with AI coding agents and maintaining traceability from specifications to production.

Highest-signal resume keywords

Go Backend EngineeringEvent-Driven ArchitectureReact/TypeScript DevelopmentAI Coding Agents ExperiencePayments/Fintech Knowledge

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Go ProgrammingAPI DevelopmentConcurrency ManagementCode ReviewDebuggingRefactoringAcceptance Criteria DesignTest DevelopmentSpecification TraceabilityData Consistency

Soft Skills

Attention to DetailProblem-SolvingCommunication

Tools & Technologies

MongoDBNATSGRPCAI Agents

Industry Keywords

PaymentsFintechIdempotencyTransactional IntegrityAudit Trails

Tech Stack

Tools & technologies

GoGRPCMongoDBReactTypeScript

About the role

Key responsibilities & impact

Take a spec and drive it to production: clarify ambiguities with the spec author instead of guessing, decompose work into small verifiable increments, execute via AI agents
Design verification before generation: acceptance criteria, tests, invariants and API contracts that make agent output checkable
Review and accept agent-generated code: catch silent scope creep, tests fitted to bugs, hallucinated APIs, code that passes but does the wrong thing
Step in and code by hand when an agent hits a dead end (mostly Go)
Build and tune the agent toolchain: skills, prompts, guardrails, workflows — and measure what matters: first-pass acceptance rate, rework volume, spec-to-production cycle time

Requirements

What you’ll need

3–5 years of professional software engineering experience
Strong Go backend engineering: services, APIs, concurrency, data consistency — this is where mistakes cost the most (our stack: MongoDB, NATS, gRPC)
Comfort with event-driven architecture: any message broker (we use NATS), idempotent consumers, outbox, sagas/compensations, retries with DLQ, eventual consistency
Working React/TypeScript: enough to deliver and review SPA features built on top of our APIs
Payments/fintech experience is a strong plus: idempotency, transactional integrity, money handling, audit trails; subscriptions and recurring billing — an even stronger plus
Proven ability to read, debug and refactor code you didn't write — most of this role is review and acceptance, not typing
Hands-on production experience with AI coding agents — not demos
Discipline to work from specs and keep requirement → code → test traceability

Benefits

Comp & perks

Opportunity to shape the future of fintech solutions within a growing company
Collaborative, horizontal team structure that values your expertise and ideas
Continuous learning and development opportunities to enhance your skills and career growth
Competitive salary and benefits package