Senior AI Product Engineer Engineering · Paris, Barcelona ·

PayFit Ltd.; Paris; Hybrid; EUR 90,000 - 130,000; Full time

Benefits offered by this job

Health insurance

Learning & Development

Career progression

Job summary

PayFit Ltd. is hiring a senior Software Engineer to shape the future of AI-enabled payroll and HRIS workflows. You will partner with business owners to design and deliver production AI features, integrating with core systems and ensuring safe, scalable solutions.

The role emphasizes collaboration across engineering and business teams and aims to improve service quality and execution speed. You’ll work with an AI Enablement team reporting to the CEO, contributing to reusable components,

Qualifications

• Minimum 7+ years in software engineering with API/systems design.
• Hands-on production experience with LLMs, agents, tools or AI workflows.
• Strong product sense to translate ambiguity into production solutions.
• Focus on security, permissions, evaluation and observability.

Responsibilities

• Partner with business users to map workflows and turn needs into AI-powered solutions.
• Design and implement integrations with APIs, apps, and data sources; build agent orchestration.
• Ship production-ready AI features with monitoring, evaluation, and safe handling.
• Prioritize opportunities with business owners and clear baselines.
• Iterate using user feedback and time-saved signals to improve reliability and adoption.
• Co-develop reusable components and patterns with Framework team for scalable delivery.
• Create templates and handoffs to empower business teams for ongoing operation.

Skills

7+ years software eng

LLMs & AI workflows

Product sense

Security & observability

Cross-functional collaboration

Ownership mindset

Job description

Get to know us

Do you want to help us shape what the future of work will look like and how it will best embrace our life's aspirations? If this sounds like a journey you want to embark on, we may have the right role for you! PayFit is an intuitive software as a service payroll and HRIS solution designed specifically for SMBs. Since 2015, 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.

Creating a fulfilling work environment and culture is also a core mission at PayFit, and our day-to-day work philosophy is reflected in our four values:

Care: We genuinely care for others whoever they are, whatever they think.

Excellence: We aim to improve and achieve better results every day.

Humility: Staying humble and exchanging transparent feedback helps us to grow and improve.

Passion: We are the architects of PayFit's success.

A key part of our culture, and essential for our success, is also improving the diversity of our teams and building an inclusive culture where you can be yourself at work.

This is why our recruitment focuses on the skills you demonstrate, and not only on your academic background or previous professional experiences. At PayFit we understand that you can gain applicable skills through a variety of life experiences and we are interested in knowing them, too.
Location:
Flexible location: work remotely from anywhere in France or Spain
Why this role, why now

AI 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.

You'll join a dedicated AI Enablement team of 4, plus a team lead reporting directly to the CEO. The team's mandate is focused delivery - identifying the highest-value workflow opportunities across Payfit, building AI agents that connect to our business systems, and iterating until solutions become part of everyday work.

You'll work in close, structured collaboration with the Application Framework team in Engineering - co-building shared permissions, approved integrations, evaluation frameworks, monitoring, and human interaction patterns. The focus team owns workflow delivery and adoption; Application Framework owns shared infrastructure and technical standards.
Success is measured in net time saved, cycle time reduction, quality improvements, sustained usage, and operating cost.

What you'll do

• Partner with business users to map workflows and turn needs into AI-powered solutions that teams actually adopt day-to-day.

• Design and implement integrations with APIs, applications, and data sources; build agent orchestration, retrieval, and custom capabilities.

• Ship production-ready AI features with evaluation, monitoring, exception handling, and human review where needed to ensure accuracy and safety.

• Prioritise opportunities with named business owners, clear baselines, and selection criteria focused on value, feasibility, and readiness.

• Iterate using user feedback and quality/time-saved signals to continuously raise reliability and adoption.

• Co‑develop reusable components, permissions, and human interaction patterns with the Application Framework team to scale safely.

• 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.

• Proven hands‑on experience building with LLMs, agents, tools, or AI workflow automation in production.

• Product sense: you can move from an ambiguous business problem to a reliable, maintainable production solution.

• Care for security, permissions, evaluation, observability, and maintainability in AI-enabled systems.

• Comfort working directly with non‑technical users and collaborating across engineering and business teams.

• Ownership mindset across the full cycle: discovery, delivery, production quality, and iteration.

Our hiring process

• Step 1 — Quick catch‑up with Talent Acquisition

• Step 2 — 45' meeting with our CTO

• Step 3 — 60–90' Technical Interview

• Step 4 — 45' Final Interview

Background Check (ISO27001 certification): identity, diploma, and past professional experience will be checked after the offer.

What we offer
Flexibility: We believe it is key to produce your best work and to be fulfilled. We therefore offer the possibility to work away from our main offices, within France/UK/Spain; as well as abroad for a defined period. Further requirements may apply depending on the role and your overall experience.
Learning & Development: In PayFit we have a great learning platform where you can learn new skills every day with the support of our company.
Career Development: We want you to progress and be free to choose which direction you want to grow. There are also opportunities for internal moves.
Health promotion: GymLib subscription with preferential rates. 4 paid sessions with a mental health practitioner and online support with Moka.Care.
Health insurance: Mutuelle Henner (60% covered by PayFit).
Transportation: 50% covered for your public transportation card for those living within Ile de France. A budget to travel to the office for those who live outside of it.
Meals: A restaurant card with our partner Swile ( 9€ per workday).
Home office budget: 150€ per year to help you get set up in the best conditions. A MacBook is our standard working tool.
Parental support: 20 weeks maternity leave covered by PayFit and 4 weeks leave for the second parent.
Time off: 25 days of holidays + RTT days (depending on the contract).
Disability Inclusion: All of our positions are open to any person living with a disability. To guarantee equal treatment and opportunities, we will take, based on individual needs, appropriate measures to adapt the work conditions of PayFiters with disabilities, and if needed also during the recruitment process. Please let us know what you need and we will do our best to accommodate!