Senior AI-native Fullstack Engineer

flyer-one-ventures; Warszawa; On-site; PLN 180,000 - 270,000; Full time

Job summary

flyer-one-ventures is seeking a Senior Fullstack Engineer to own features from database to UI in our AI-native squads. The stack runs on AWS with PHP/Laravel and Node.js/NestJS for the backend and React/TypeScript on the frontend, using AI-assisted workflows daily.

You will deliver end-to-end features across all layers, ensuring reliability in payroll systems, and collaborate with product and design in a small squad to scope, estimate, and prioritize work.

Qualifications

• 5+ years of professional software engineering experience across backend and frontend.
• Backend in PHP/Laravel or Node.js/NestJS; frontend in React/TypeScript.
• Experience with AWS, relational databases, and API design (REST/GraphQL).
• Familiar with AI-assisted development and testing practices.

Responsibilities

• Own and deliver features end-to-end across the full stack (backend services, APIs, frontend interfaces, and data layers).
• Design, build, and operate production systems in a payroll domain where correctness and reliability are non-negotiable.
• Use AI coding tools as a daily force multiplier for writing, reviewing, and refactoring code.
• Write and maintain automated tests with AI-assisted generation, aiming for high coverage with minimal manual effort.
• Participate in lean team rituals: async-first communication, lightweight code reviews, and continuous deployment.
• Collaborate closely with product and design in a small squad to scope, estimate, and prioritize work.
• Contribute to defining and evolving our AI-augmented engineering practices and toolchain.
• Take shared ownership of operational concerns: monitoring, alerting, incident response, and on‑call rotations.

Skills

Fullstack development

React/TypeScript

PHP/Laravel

Node.js/NestJS

AWS

API design

Testing fundamentals

Async communication

Ownership

Tools

AWS Cloud

REST APIs

GraphQL

Relational DBs

Job description

As a Senior Fullstack Engineer on one of our new AI-native squads, you will own entire features

from database to UI. Our stack runs on AWS with PHP/Laravel and Node.js/NestJS powering

the backend services, and React with TypeScript on the frontend. You will be expected to

leverage AI coding assistants, automated testing tools, and generative AI workflows as core

parts of your daily process—not as occasional novelties.

What you will be responsible for:

• Own and deliver features end-to-end across the full stack (backend services, APIs, frontend interfaces, and data layers)
• Design, build, and operate production systems in a payroll domain where correctness and reliability are non-negotiable
• Use AI coding tools (e.g., Claude Code, Cursor, Copilot) as a daily force multiplier for writing, reviewing, and refactoring code
• Write and maintain automated tests with AI-assisted generation, aiming for high coverage with minimal manual effort
• Participate in lean team rituals: async-first communication, lightweight code reviews, and continuous deployment
• Collaborate closely with product and design in a small squad to scope, estimate, and prioritize work
• Contribute to defining and evolving our AI-augmented engineering practices and toolchain
• Take shared ownership of operational concerns: monitoring, alerting, incident response, and on‑call rotations

What We Are Looking For

Must-haves:

• 5+ years of professional software engineering experience with meaningful exposure to both backend (PHP or Node.js) and frontend (React/TypeScript) development
• Strong proficiency in our core stack: PHP/Laravel and/or Node.js/NestJS on the backend, React with TypeScript on the frontend Hands-on experience with AWS cloud infrastructure, relational databases, and API design (REST or GraphQL)
• Demonstrated comfort with AI-assisted development workflows—you already use AI tools regularly and can articulate how they change your process
• Strong fundamentals in testing: you know when to write a unit test, an integration test, or lean on AI-generated test suites
• Excellent async written communication—you document decisions, write clear PRs, and can drive alignment without meetings
• Ownership mindset: you do not wait for someone else to write the migration, fix the flaky test, or update the runbook

Nice-to-haves:

• Experience in payroll, HR tech, or fintech domains where precision and compliance matter
• Familiarity with prompt engineering, AI agent frameworks, or building LLM-powered features into products
• Experience migrating or integrating between PHP/Laravel and Node.js/NestJS services
• Experience working in small, high-autonomy teams (startups, platform teams, or similar)
• Background in QA or testing automation—understanding quality from first principles
• Contributions to developer tooling, CI/CD pipelines, or internal platform improvements

Why This Role Is Different

We are not adding “AI” to a job title for marketing purposes. We are restructuring our entire

engineering organization around a thesis: small teams of strong fullstack engineers, deeply

integrated with AI tools, can outperform larger traditional teams in speed, quality, and developer

satisfaction.

What this means in practice:

• You will not hand off work to a separate QA team—you own quality, aided by AI-powered testing and code review
• You will not wait on a backend engineer to build your API—you build the whole feature
• You will have real input into the tools and workflows the team adopts—this transformation is being built collaboratively
• You will work in a team of 2–3, not 5+, which means less coordination overhead and more building time