Senior Software Engineer

Tradition is the interdealer broking arm of Compagnie Financière Tradition and one of the world's largest interdealer brokers in over-the-counter financial and commodity related products. CFT is represented in over 28 countries, employing over 2,500 people.

Tradition's goal is to provide superior client services. It believes its business success is a direct reflection of its employees and recruits. As such, teamwork, creativity, reliability and integrity are components of a work ethic taken very seriously since the company was founded in 1959.

Tradition is currently seeking to appoint a Senior Software Engineer to be based within the Lausanne office.

• Audit existing projects to identify recurring software requirements, patterns and opportunities for standardisation across repositories.
• Consolidate the strongest existing implementations into versioned, documented and well-owned internal packages, with clear interfaces and well-defined module boundaries.
• Define and maintain the software strategy, prioritising shared libraries and components that will deliver the greatest value across the wider engineering organisation.
• Design, evaluate and select internal tooling with stable, well-documented APIs, building bespoke solutions only where suitable existing tools do not meet requirements.
• Support the transition of projects from proof of concept to production, acting as the engineering bridge between Data Science and Data Engineering through architecture reviews, refactoring guidance and modularisation.
• Review technical designs at project inception to encourage the use of shared components, reduce duplication and ensure solutions are designed for maintainability, testing, deployment and reuse.
• Lead the incremental migration of existing projects onto shared components, balancing technical improvements with the need to maintain delivery timelines.
• Mentor and support the team on software engineering best practices, including SOLID principles, modular design, information hiding, abstraction, API design and managing change over time.
• Own and maintain project templates with CI/CD, linting, type checking and test frameworks pre-configured, ensuring new projects start with consistent engineering standards.
• Own the shared AI-assisted development configuration, including project context, hooks and coding standards, ensuring consistent development practices and code quality across the team.
• Work closely with the Data Science and Data Engineering workgroup to translate agreed technical standards and decisions into practical, reusable infrastructure and tooling.

• Master's degree in Computer Science, Software Engineering or a related field.
• At least 5 years of experience in software engineering.
• Expert-level Python, with demonstrated library and API design experience: you have built and maintained internal packages that other teams depended on.
• Strong software design fundamentals: design patterns, modularity, information hiding, abstraction layering, API design, and managing change over time.
• Solid engineering practice:
• Git / version control and code review discipline
• Unit & integration testing
• CI/CD, linting, type checking, environment promotion
• Logging, error handling, debugging
• Working understanding of machine learning principles.
• Fluency with modern AI-assisted development, and clear opinions on the guardrails it requires.
• Comfortable in Linux and containerised environments (e.g. Docker).
• Excellent communication skills.

• Familiarity with ML lifecycle tooling: experiment tracking, model registries, model monitoring.
• Knowledge of ML Ops principles and pipelines.
• Experience with distributed data processing (e.g. Spark / PySpark).
• Exposure to quantitative finance data and workflows.
• High-level understanding of Kubernetes.

Tradition do not accept agency CV's. Please do not forward CV's to our employees or Talent team. Tradition are not accountable for any fees related to unsolicited resumes. The Talent team will reach out to trusted agents when required.

Please note, due to the large volume of applications for this position, only suitable candidates will be contacted. If you have not heard from us within 14 days, unfortunately, your application has been unsuccessful.

Tradition welcome all suitable applications and are an equal opportunity employer who value diversity. All employment is decided on the basis of qualifications and merit.

By applying for this role, you agree that we may retain your details on our system for a period of 6 months and may contact you for any future vacancies that may arise within the Tradition Group.