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

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 .We look forward to hearing from you!