Staff Backend Engineer (B2B - Warsaw)

Staff Backend Engineer (Warsaw)

Location: Warsaw, Poland — Onsite (4 days / week)

Contract: B2B · 30–45 k PLN net / month + ESOP

About Fresha

Fresha is the leading AI-powered operating system for the global beauty and wellness industry, giving businesses everything they need to run smarter, grow faster and build stronger client relationships.

In May 2026, Fresha secured an $80M growth investment from KKR at a valuation of $1B, officially reaching unicorn status and bringing total funding raised to $285M. Already profitable, Fresha is using this investment to accelerate global expansion and drive the next generation of AI and product innovation.

Today, Fresha operates at global scale, with offices across Europe, North America, the Middle East and Asia Pacific. Our platform is trusted by 130,000+ beauty and wellness businesses across 120 countries, with more than 1.5 billion appointments booked to date.

Our mission is simple: help beauty and wellness businesses grow by giving them the technology they need to attract clients, manage their operations and run their business in one place.

We’re continuing to scale rapidly across markets, teams and products, making this an exciting time to join us.

Your Impact as a Staff Backend Engineer

Are you ready to make a significant impact in a fast-paced, autonomous environment? We're seeking an exceptional Staff Backend Engineer to join our cross-functional product team in Warsaw.

What You'll Do:

• Technical - this is a heavily technical role; hands-on coding skills are expected. It’s not a management role
• Leadership - Own and deliver cross-team and cross tribal technical initiatives
• Architectural - Take ownership of architecture for a tribe
• Guidance - Sought out for technical guidance; anticipating technical issues at the product level and making architectural and design decisions to avoid them
• Improvements - Create sweeping improvements in stability, performance and scalability across major business-critical systems
• Delivery - Ensure timely delivery of your team’s projects, which will ultimately have a tangible impact on Fresha’s success
• Lead-by-example - Make sure your team follows our engineering practices by leading from the front
• Collaboration - Work closely with diverse functions within the team across Product, Design, Data and QA and make sure that the team has clear goals and regularly delivers value to our users
• Learning - Facilitate continuous learning and improvement for your team
• Standards - Make sure that the systems your team owns meet Fresha quality, reliability and scalability standards
• Innovative - You will be anticipating broad technical changes and ensuring Fresha is always ahead of the curve
• Strategic - Recognising and making trade-offs concerning the whole system. You have a deep understanding of the entire architecture for a significant part of our business, and you’re able to articulate clearly the scaling and reliability limits of that area.
• Multiplier - Primarily acting as a multiplier by building systems, authoring tools or introducing policies or patterns that raise the level of productivity of the entire organisation
• Communication - Communicating the awesomeness of Fresha in different Tech communities externally via talks and blog posts, identifying areas that we can share effectively with the outside world, guiding the creation of content and communication around those areas. Leading conversations internally about the direction of significant areas of technology, driving wide-team consensus on the adoption of this direction and using this direction to inspire engineers

This list is not exhaustive, and there may be other activities you are required to deliver.

What we are 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.

Delivery - You have consistently delivered large systems involving one or more teams’ contributions on time at a high level of quality

Problem-solving - You’ve had to quickly break down complex problems into potential solutions, knowns, and unknowns, in order to get a solid resolution faster

Debugging - You’re capable of debugging the hairiest problems that the team encounters

Strategy - Played a key role in developing multi-year technology strategy for complete and critical areas of the business that encompass multiple systems and teams

Adaptability - You have created an architecture that enables many potential futures without knowing exactly what the future is

Relationships - Ability to interact with people from across the business and build strong relationships, including the ability to effectively influence upwards

Facilitation - Listened and guided debates to help reach consensus; once a decision is made clearly communicate the decision(s) back

Planning - Set short to medium-term strategic technical direction, able to look ahead 6-12 months identify areas of greatest need and create plans to improve them

Mentorship - You’re seen as a role model and mentor to every technical member of the team

Contribution - Recognised as a prolific contributor to core and side projects

Simplification - Consistently reduced the complexity of projects, services, and processes to get more done with less work

Architecture - Shaped broad architecture; shipped multiple large services, complex libraries or major pieces of infrastructure

Impact - Made obvious positive impact on an entire company’s technical trajectory

Team-player - Happy to roll sleeves up and assist the team when required (team player)

Proactive - Self-starter and proactive approach

Adaptive - Comfortable working in a fast-paced and changing environment

At Fresha, we value passion and potential as much as specific skills. If you're enthusiastic and eager to learn, we encourage you to apply, even if you don't meet every listed requirement. We believe in fostering growth and providing the support needed for you to excel in your role.

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!

Benefits

Taking part in the decision making process of migration to microservices.

Learn how to design, deploy and maintain complex applications.

Help us to introduce other technologies such as serverless services, SQS, continuous delivery and deployment and more.

Flexi-time (around core hours)

Competitive salaries & RSUs

20 days PTO

Travel coverage when visiting teammates - through workshops and social events

25,000 zł - 42,000 zł a month

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.