LexiFi Software Engineer France, Paris, France 2026-06-27 https://www.lexifi.com/careers/softwa[...]

LexiFi; Paris; Sur place; EUR 55 000 - 75 000; Plein temps

Résumé du poste

A leading fintech company is seeking a full-time Software Engineer to join its core development team in Paris. You'll implement and evolve core products using OCaml, collaborating with quantitative engineers and contributing to cloud-hosted projects. Ideal candidates will have strong software engineering experience and a background in algorithms and data structures. The role offers a hybrid work model, allowing up to 2 remote days per week while working in a high-caliber engineering culture that values R&D and code quality.

Qualifications

• Strong software engineering experience, either professional or significant open-source work.
• Solid foundations in algorithms, data structures, and software design.
• Collaborative mindset with clear communication and problem-solving approach.
• Interest or experience in financial markets.
• This is a full-time role based in Paris at LexiFi’s headquarters.
• Hybrid work model — up to 2 remote days per week.

Responsabilités

• Implement new features across the stack (UI, APIs, services) in OCaml.
• Develop services and libraries that power complex financial workflows.
• Improve testing, performance, and developer experience.
• Collaborate with quantitative engineers on models and data pipelines.
• Contribute to deployment and operational excellence.

Connaissances

Software engineering experience

Exposure to OCaml

Solid foundations in algorithms

Collaborative mindset

Interest in financial markets

Formation

Degree in computer science or mathematics

Outils

OCaml

Cloud or DevOps practices

Description du poste

LexiFi is looking for a full-time Software Engineer to join its core development team.

Software Engineer (OCaml) — Paris, France

LexiFi is a leading software provider in the financial derivativesand structured products market. Our solutions are used worldwide byinvestment banks, private banks, asset managers, insurance firms,and fintech companies. We empower users with tools to create,price, and manage complex financial products — and we also offer ourtechnology as software libraries integrated by partners and serviceproviders globally.

We’re growing our core development team at our Paris headquarters(8th arrondissement). You’ll help design and buildfrontend and backend features, infrastructure components, and internal tooling —almost entirely in OCaml, a language weactively contribute to. As LexiFi expands its cloud-hostedofferings, you’ll also collaborate on deployment and reliabilitytopics alongside our DevOps engineers.You’ll join an international, collaborative environment that valuesengineering excellence — we invest heavily in R&D andcode quality, making this a great place to craft beautiful,reliable software.

🚀 What You’ll Do

• Build and evolve core products — Implement new features across the stack (UI, APIs, services) in OCaml.
• Design reliable backend components — Develop services and libraries that power complex financial workflows.
• Raise the bar on code quality — Improve testing, performance, and developer experience.
• Collaborate with quantitative engineers — Partner with our math-finance team on models, pricing engines, and data pipelines.
• Work closely with client-facing teams — Shape solutions with sales, support, and partners; occasionally join client conversations.
• Support cloud-hosted projects — Contribute to deployment, instrumentation, and operational excellence.

🧰 What You Bring

• Strong software engineering experience (professional or significant open-source work).
• Solid foundations in algorithms, data structures, and software design.
• Collaborative mindset, clear communication, and a problem-solving approach.
• Exposure to OCaml or functional programming.
• Exposure to cloud or DevOps practices.
• Interest or experience in financial markets.
• A degree in computer science, mathematics, or related fields.
• This is a full-time role based in Paris (8th arrondissement) at LexiFi’s headquarters.
• Hybrid work model — up to 2 remote days per week, with flexibility in choosing which days.
• Join a fintech company at the intersection of finance and software engineering.
• Work with a team that invests heavily in R&D and code quality.
• Build across a broad technical spectrum with direct impact on core products.
• Build products trusted by global leaders in finance and tech, across America, Asia and Europe.
• Be part of a collaborative, high-caliber engineering culture that values learning, initiative, and flexibility.

🐪 LexiFi and OCaml

• The first company to adopt OCaml (in 2001) — and we’ve since helped partners adopt it too.
• Active in the OCaml maintainers team, the Dune development team, and the broader OCaml OSS ecosystem — see our work .
• Regular sponsor of OCaml-related conferences and community events.

💬 Interested? Send your resume and a short motivation letter to [e-mail] .We look forward to hearing from you!