Senior Software Engineer

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 :

The position is based in France or Spain

Position Overview:

You will join the Low-Code Build & Run team, whose mission is to empower PayFit's business by providing a robust low-code platform (JetLang). This platform enables both technical and non-technical internal users (Product Builders – Low-Coders – and Product Compliance teams) to translate legal and business rules into payroll configuration and compliance systems integrated directly into our product.

Impact - next 12 months:

As a Senior Software Engineer, you will play a critical role in multiple areas:

Ensure the platform can scale with our growing number of customers and diversity of collective bargaining agreements (CBAs) that we manage.

Collaborate with compliance and legal teams to translate regulatory requirements into platform capabilities.

Implement systematic compliance testing frameworks that allow compliance experts to define and run test cases declaratively.

Improve experience and efficiency for our internal users (Product Builders, Domain Teams, Compliance teams).

What will you do

• Design and implement new features for the JetLang low-code platform

• Evolve Low-Code platform architecture to support complex Collective Bargaining Agreements

• Contribute to the future of our compliance engine, leveragingthe latest technologies, ensuring "Compliance by Design" principles are embedded in platform features

• Implement monitoring, SLOs, and observability for critical platform components

• Maintain high code quality through reviews, testing, and documentation

• Work closely with Product Builders, Domain Teams, and Compliance experts

This Role is For You If :

• You have 5+ years as a Software Engineer, ideally with secure, multi‑tenant systems, knowing Typescript

• You have full-stack engineering experience in SaaS platforms

• You focus on code quality, testing, and maintainability

• You are attentive to observability (signals, alerts, SLOs) and understand the importance of maintaining healthy systems

• You are attentive to observability (signals, alerts, SLOs) and understand the importance of maintaining healthy systems

• You communicate effectively with cross-functional teams and focus on customer outcomes

• You have experience improving technical quality and delivering impactful changes in complex systems

• You're comfortable with ambiguity and can navigate organizational complexity

• You create clear documentation and collaborate with others

• You are fluent in English and French

It would be great if you also have:

• Experience with building low-code platforms, DSLs (Domain-Specific Languages), or rules engines is a significant plus.

• Understanding of Event‑Driven Architecture and Domain‑Driven Design principles.

Interview process:

1. Discovery Call: Meet a Talent Acquisition Specialist min)

2. Discussion with an Engineering manager: Meet Arnaud, the team's EM, to discuss technical aspects of your experience (45 min)

3. Technical Interview 1: Coding challenge with 2 team members (1 hour)

4. Technical Interview 2: System Design challenge with 2 team members (1 hour)

5. Product Discussion: Discussion with Product Manager (45 min)

6. Director Discussion: Final discussion with the Engineering Director of the tribe (30 min).

Background Check (ISO27001 certification): identity, diploma, and past professional experiences 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. We also have English language courses to improve your business communication vocabulary and get to the next level.
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

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