Senior Software Engineer - Python

The opportunity “Artificial Intelligence has shifted from prediction to practice, ushering in the autonomous enterprise—where systems of intelligence drive operations, not just support them.”For the past eight years, we've been supporting some of the most iconic enterprises to embrace the potential of AI. Building on our experience and proven impact, we are now more committed than ever to our vision: creating a world of possibility through Superlinear productivity gains.The next step is clear: we are broadening our horizon throughout Europe, supporting the world’s most critical enterprises in their transformation. To realize this ambitious vision, we’re seeking sharp minds and steady hands: people who care deeply, are mission-driven, build boldly, and own the outcome.That's why we are hiring a Senior Software Engineer - Python.The roleAs our Software Engineer specialized in Python, you'll be the architect of our core platform infrastructure. You'll write modern, fully type-annotated Python that sets the standard for the team, design elegant abstractions, and build robust systems that define how we deliver software.What You’ll BuildArchitectural DesignDesign clean abstractions that make complex systems simple to useCreate interfaces that elegantly separate concerns and enable modularityArchitect systems with minimal dependencies and maximum maintainabilityDesign modern RESTful APIs following OpenAPI specifications and best practicesDefine data models that capture business logic while remaining flexibleBuild foundational components that other engineers will build uponDesign data connectors that reliably integrate with enterprise systemsEngineering ExcellenceDesign clean abstractions that make complex systems simple to useCreate interfaces that elegantly separate concerns and enable modularityArchitect systems with minimal dependencies and maximum maintainabilityDesign modern RESTful APIs following OpenAPI specifications and best practicesDefine data models that capture business logic while remaining flexibleBuild foundational components that other engineers will build uponDesign data connectors that reliably integrate with enterprise systemsRobust Backend SystemsBuild RESTful APIs that are intuitive, well-documented, and performantCreate systems with deep observability built in from the ground upBuild authentication and authorization systemsImplement robust data validation and processing layersDevelop the core libraries that standardize how we build featuresBuild security into every layer of the applicationWho You AreEssential ExperienceExpert-level modern Python programming with mastery of type annotationsProven experience building production systems that work at scaleStrong architectural skills with ability to design simple solutions to complex problemsTrack record of building maintainable systems that others want to work withExperience setting technical standards and leading by exampleSkills That MatterModern Python expertise (typing, async/await, uv, ruff, Python 3.12+)PostgreSQL and relational database designFastAPI and RESTful API designMonorepo toolchains (e.g., moon, pants, or bazel)Git and collaborative development workflowsComprehensive testing with pytest (unit, integration, end-to-end)Monitoring and observability toolsSecurity best practicesDocumentation and technical writingFluency in English, any other languages is a plusMindset & ApproachPreference for proven technology that worksFocus on simplicity and minimizing dependenciesObsession with robustness and operational excellenceClear communication of complex concepts to diverse stakeholdersPassion for craftsmanship and doing things rightAbility to balance pragmatism with technical excellenceWhy this role mattersYou'll be defining how we write Python and setting the technical foundation for our platform. Your architectural decisions will impact every feature we build and every integration we create. You're not just writing code—you're establishing the engineering culture and standards that will scale with our team.This is a role for someone who cares deeply about modern Python craftsmanship, who believes that good architecture makes everything else possible, and who wants to build systems that are a joy to operate and extend.What We OfferImpact: Your code will power the core systems used by Europe’s most critical enterprises.Challenge: Solve complex problems with elegant, simple solutionsLeadership: Set the standards for Python engineering and mentor the teamGrowth: Take on increasing ownership in a fast-evolving platformCollaboration: Work closely together with our Brussels teamCompensation: Competitive salary with performance bonus and equityBenefits: Comprehensive health insurance, group insurance, meal/eco vouchers, full transportation coverage, internet allowance, and additional Superlinear holidays. Tools: MacBook Pro, cloud compute resources, and optimization solver licensesTeam: Collaborate with brilliant minds in AIReady to build it right?If you're passionate about modern Python, believe in building robust systems with proven technologies, and want to set the engineering standard for a growing team, we want to hear from you.Join us in building Python systems that are powerful in their simplicity and bulletproof in their execution.