Full Stack Engineer

Antler; Województwo wielkopolskie; On-site; PLN 90,000 - 120,000; Full time

Job summary

Antler is seeking a Full Stack Software Engineer located in Poland, Województwo wielkopolskie. This role requires a dynamic individual who can help build the trust layer in AI-driven software development. The engineer will have responsibilities that include deploying software daily, training AI agents, and turning prototypes into production.

The ideal candidate has a strong background in AI development, experience with full-stack responsibilities, and a passion for outcomes over outputs. Join Antler to help shape the future of software development.

Qualifications

• Experience in building AI features in production.
• Ability to thrive in fast-paced environments with high ownership.
• Demonstrated ability to ship products with limited resources.

Responsibilities

• Deploy daily and adapt quickly to changes.
• Engage with users to inform the roadmap.
• Train AI agents for dynamic testing.
• Manage the complete stack from development to production.
• Conduct real experiments on testing models.

Skills

AI/LLMs fluency

Full-stack development

Startup experience

Experimental instinct

Python

TypeScript

Job description

Change Software Forever

Most engineering roles build software nobody fully trusts. This one builds the trust layer itself. AI is making engineers dramatically more productive. The problem is nobody fully trusts what AI ships.

Why this matters now

AI is rewriting how software gets built. But shipping still breaks on testing. Engineering leaders are desperate to release faster without dropping quality, and they can't get there with manual QA or brittle test automation.

Here's the bigger shift: as AI writes more of the code, the bottleneck moves from generating software to trusting it. Nobody owns that trust layer yet. Duku is building it, autonomous agents that simulate real users, catch critical failures before production, and self-heal as the product evolves.

Backed by experienced operators and investors, we're building what we believe will become a core layer of the modern software stack. We're looking for an exceptional Full Stack Software Engineer to help build it. Not someone to maintain a codebase. Someone to define one.

What You’ll Do

• Ship fast, learn faster: We deploy daily, not monthly
• Talk to users, shape the roadmap: Sit in the trenches with founders on calls that define what we build
• Train AI agents: Design LLM-powered testers that explore, learn, and adapt in real time
• Own the stack: Python, TypeScript, cloud infra, from commit to production
• Turn prototypes into production: Run real experiments on models, embeddings, and retrieval pipelines

What We’re Looking For

• Relentless drive: You execute fast, adapt faster
• Startup scar tissue: You’ve shipped product with no safety net
• Fluency with AI/LLMs: LangChain, vector stores, prompt engineering
• Full-stack firepower: Frontend, backend, infra, no silos
• Product obsession: You care more about outcomes than outputs
• Experimental instinct: You build - test - learn - repeat

Ideal Background

• Shipped AI features in prod
• Built something from 0 to 1
• Thrived in chaos with high ownership

Why This Matters

Software is accelerating. QA hasn’t kept up. Autonomous testing is inevitable, and we’re building it.

Five years from now, every high-velocity team will rely on AI agents like ours to ship faster, safer, and smarter.

Join now, and help make that future real, before someone else does.