Backend Engineer (B2B - Warsaw)

Location: Warsaw, Poland — Onsite (4 days on-site)
Contract: B2B · 25–40 k PLN net / month + RSUs

The AI-powered OS for beauty,
wellness and self-care

Fresha is the operating system for the global beauty, wellness and self-care industry, connecting and powering everything from salons and barbers to spas, medspas, fitness studios and health practices.
Marketplace + SaaS platform + Fintech
Fresha is the leading AI operating system trusted by millions of consumers and businesses worldwide. Fresha is used by 130,000+ businesses and 450,000+ stylists and professionals worldwide, processing over 1 billion appointments to date. Empowering businesses with an all-in-one platform for bookings, point-of-sale, marketing, and more, while connecting consumers to local services.

Your Impact as a Backend Engineer
At Fresha, we believe AI is a force multiplier for feature delivery, not just a coding assistant. We provide every engineer with top-tier tooling (Claude, GitHub Copilot, Cursor) to strip away technical toil—so you can focus your energy on shipping high-impact product features. We value engineers who know how to leverage these tools to drive momentum within our 6-week cycles, accelerating the journey from concept to code while maintaining the deep technical judgment to verify, secure, and own the final user experience. 
Are you ready to make a significant impact in a fast-paced, autonomous environment? We're seeking an exceptional Backend Engineer to join our cross-functional product team in Warsaw.
What You'll Do:
* Collaborate closely with Product, Design, Frontend, Infrastructure, and Mobile engineers to take features from discovery to rollout and beyond.
* Be responsible for features from discovery to observability: technical design, implementation, testing, and rollout.
* Design, build, and maintain efficient, scalable, and reliable Ruby/Elixir code.
* Work with a polyglot stack (Ruby, Elixir, GraphQL, TypeScript, gRPC) and modern messaging systems (Kafka).
* Operate within a Kubernetes-driven environment as we continue moving to a microservice architecture.
* Embrace Domain-Driven Design to build high-quality, impactful products from inception to delivery.

What We're Looking For:

• AI-Augmented Workflow: You have deep experience building and interacting with AI agents, using them to amplify your output to 5x that of manual coding. You are able to integrate agents into our workflow while strictly adhering to our architecture and security standards, taking full accountability for ensuring all generated code meets the quality expectations of a Senior Engineer.
• Experience building and maintaining globally distributed systems.
• Knowledge of event-driven architectures (Kafka).
• ~2+ years of experience in product engineering, developer tools, or infrastructure at scale.
• A pragmatic generalist who thrives on learning new frameworks and tackling complex challenges.
• Familiarity with languages such as Elixir, Ruby, or TypeScript is a plus.

Why Join Fresha?

• Real Impact: Directly influence our product and architecture in a rapidly growing global business.
• Cutting-Edge Tech: Work with modern technologies and contribute to a significant migration to microservices.
• Dynamic Culture: Be part of a team that encourages autonomy and innovation.

Don't meet every requirement? We value passion and potential. Apply today and let's grow together!

Interview Process

• Screen Stage - Video-call with a member from the Talent Team (45-60min)
• 1st Stage - Technical video/In-person interview with the team (90min)
• 2nd Stage - Technical Video/In-person interview with Team (up to 2 hours)
• Final Stage - Video interview with Head of Engineering / VP of Engineering (60min)

We aim to finalise the entire interview process and deliver feedback within 4 weeks.
Every job application received is reviewed manually by our talent team. While we strive to assess applications within 7 days, the sheer volume of talented individuals expressing interest may occasionally extend this timeframe