Get to know usDo you want to help us shape what the future of work will look like and how it will best embrace our life's aspirations?

Pay Fit is an intuitive software as a service payroll and HRIS solution designed specifically for SMBs. Since ****, we have set ourselves a mission to simplify payroll for SMBs and enable employers and employees to grow together. We are a European company operating from 3 main countries (France, Spain, and the UK) where we are supporting over 20,000 clients.LocationFlexible location: work remotely from anywhere in France or SpainWhy this role, why nowAI is already embedded across Payfit's operations.

Now we're doubling down and scaling it as a business-critical capability. We're redesigning high-value workflows so our teams execute faster, with greater accuracy and consistency — and we're doing it with direct CEO sponsorship.To scale this reliably, we need engineers who blend product sense with strong software fundamentals: people who can go from an ambiguous business problem to a production solution that users actually adopt. You'll partner directly with business owners, integrate with our core systems, and iterate based on real usage and quality signals.

The goal: ship production solutions that measurably improve service quality and execution speed across Payfit.Success is measured in net time saved,



cycle time reduction, quality improvements, sustained usage, and operating cost.Design and implement integrations with APIs, applications, and data sources; Ship production-ready AI features with evaluation, monitoring, exception handling, and human review where needed to ensure accuracy and safety.Iterate using user feedback and quality/time-saved signals to continuously raise reliability and adoption.Increase autonomy in business teams by creating templates, training local champions, and establishing clear ownership for ongoing operation and improvement.

What You'll Bring 7+ years of software engineering experience, including API and systems design.Ownership mindset across the full cycle: discovery, delivery, production quality, and iteration. We believe it is key to produce your best work and to be fulfilled. 4 paid sessions with a mental health practitioner and online support with Moka.

Health insurance: A budget to travel to the office for those who live outside of it.Home office budget: 150€ per year to help you get set up in the best conditions. 20 weeks maternity leave covered by Pay Fit and 4 weeks leave for the second parent.Time off: 25 days of holidays + RTT days (depending on the contract).

📌 Senior Ai Product Engineer (Barcelona)
🏢 Payfit
📍 Barcelona