Staff Software Engineer M/F/Mx

Trustpair; Paris; Hybrid; EUR 90,000 - 130,000; Full time

Job summary

Trustpair, a security-focused fintech, is seeking a Staff Software Engineer to drive the fraud-detection engine’s evolution. You’ll architect for scale, lead cross-functional efforts, and push LLM-based insights into evaluation workflows.

You’ll mentor engineers, improve observability and performance, and collaborate with Product and Engineering leadership to shape the technical roadmap. This hybrid/remote Paris-area role offers significant ownership in a fast-growing company.

Qualifications

• Experience designing large-scale distributed systems and architectures.
• Ability to lead cross-functional technical projects from concept to delivery.
• Strong background in building scalable web services and data pipelines.

Responsibilities

• Architect and own the technical vision for large-scale, distributed systems, focusing on the fraud-detection engine.
• Lead complex, cross-functional technical projects from conception to completion, aligned with product strategy.
• Shape the technical roadmap with Product and Engineering leadership; identify challenges and propose solutions.
• Drive innovation by applying LLM-based insights to business problems and improving system capabilities.
• Mentor engineers within the squad and across the org, promoting best practices in software architecture and design.
• Ensure observability, scalability, and performance of core systems, enabling reliability and efficiency.

Skills

Distributed systems

Software architecture

Ruby on Rails

LLM/AI integration

DevOps

Mentoring

Tools

Cursor

Job description

Trustpair stops vendor fraud before it happens. We're the automated vendor validation platform protecting 600+ enterprise companies worldwide. Since 2017, finance and procurement teams have used Trustpair to eliminate vendor fraud while reclaiming 90% of the time they once spent on manual checks.

As vendor fraud grows more sophisticated, we stay ahead by combining deep expertise in financial crime with cutting-edge technology. Our core product focuses on secure, reliable vendor account validation to wipe out fraud and boost efficiency.

Internally, teams across Trustpair use AI tools in their day-to-day work to automate repetitive tasks and unlock strategic insights that help us build and operate better. From day one, you’ll be encouraged and trained to integrate these tools into your workflow in a practical, hands‑on way.

With offices in New York, Paris, London, and Milan, we’re a diverse team united by a bias for action. We ship fast, learn from experiments, and tackle problems that matter: protecting billions in payments for companies worldwide. If you want to see your work make an immediate impact in financial security, Trustpair is built for you.

Learn more about how we use AI in our everyday work.

About the role

As a Staff Software Engineer on our Core Evaluation team, you will be a technical authority driving the evolution of our most critical asset: the fraud detection engine. This is a pivotal role where you'll not only architect for scale and resilience, but also spearhead the integration of LLM‑based insights to rethink our evaluation process.

You will be entrusted with our most complex and ambitious projects, shaping advanced solutions from ambiguous requirements. Working within a dedicated squad, you will collaborate closely with your Engineering Manager, Product Manager, and fellow engineers to turn a strategic vision into a technical reality that further strengthens Trustpair's position as a market leader.

Location: either Paris (hybrid), or full remote in France.

What you’ll do:

• Architect and Own: Design, architect, and own the technical vision for large-scale, distributed systems at the heart of our platform, with a focus on our complex evaluation workflows.
  

• Lead Technical Strategy: Lead complex, cross‑functional technical projects from conception to completion, ensuring alignment with product strategy and client needs.
  

• Shape the Future: Partner with Product and Engineering leadership to build and refine the technical roadmap. You will identify key technical challenges and propose innovative solutions that drive our business forward.
  

• Drive Innovation: Champion a culture of innovation and continuous improvement. You will be directly involved in transforming the Trustpair engine by exploring and implementing new technologies, with a strong focus on applying LLM‑based solutions to solve complex business problems.
  

• Mentor and Elevate: Act as a technical mentor and force multiplier for engineers within your squad and across the organization, promoting best practices in software architecture, design, and strategic thinking. Help the engineering manager drive the cultural shift to strengthen the customer focus.
  

• Ensure Operational Excellence: Promote and implement best practices for observability, scalability, and performance, ensuring our core systems are reliable and efficient.
  

What’s in it for you?

• High‑Impact in a High‑Growth Environment: Join a company with 50%+ business growth where tech is one of the core accelerators. You’ll be building solutions for a platform with rapidly increasing usage, directly influencing our success.

• Shape Our Future (Scaleup Phase):We want your voice in making the critical architectural, product, and organizational decisions that will define our future.

• Modern Stack & AI‑Powered Engineering: Work with a clean Ruby on Rails stack, state‑of‑the‑art DevOps, and managed tech debt. We are aggressively adopting AI, both in our product (LLMs) and to boost your own efficiency with tools like Cursor.

• Culture of Full‑Fledged Engineering Ownership:You are an engineer with a strong voice and full accountability. We empower you to drive initiatives from technical design to final impact.

• Accelerated Career Growth:Our rapid expansion creates constant and significant opportunities for career advancement, skill development, and taking on new leadership responsibilities.

• Collaborative & International Team: Thrive in a diverse, cross‑functional, and international environment.