Senior Software Engineer - Python

The opportunity 

Enterprise productivity across Europe is under pressure. As complexity increases through geopolitical shifts, labour constraints, and tighter operational interdependencies, many organisations observe that AI and optimization efforts improve local efficiency but fail to deliver structural, enterprise-level gains. 

At Superlinear, we address this gap through enterprise orchestration: enabling better system-level decision-making across people, processes, and machines in environments where siloed optimization no longer works.

In our earliest pilots with leading European enterprises, we’ve seen that moving from local optimization to coordinated, enterprise-wide decisions can unlock significant latent capacity. Productivity gains in the range of 10–30% are achievable by reducing systemic friction rather than adding infrastructure. 

The 500 largest European enterprises represent roughly €14 trillion in economic output. Enabling even a fraction of them to structurally improve productivity would have impact beyond individual companies. 

This is a long-term effort that requires rigor, restraint, and people who care deeply about their craft, take responsibility for outcomes, and are comfortable working on complex, high-stakes systems. This role offers the opportunity to contribute meaningfully to the foundations of enterprise orchestration in Europe’s most critical organisations.

That's why we are hiring a Senior Software Engineer - Python.

The role

As 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 build

Architectural Design

• Design clean abstractions that make complex systems simple to use

• Create interfaces that elegantly separate concerns and enable modularity

• Architect systems with minimal dependencies and maximum maintainability

• Design modern RESTful APIs following OpenAPI specifications and best practices

• Define data models that capture business logic while remaining flexible

• Build foundational components that other engineers will build upon

• Design data connectors that reliably integrate with enterprise systems

Engineering Excellence

• Mentor team members through code reviews and architectural discussions

• Set the standard for modern Python code quality across the engineering team

• Establish architectural patterns and best practices for the entire codebase

• Design and implement comprehensive testing strategies

• Create exemplary documentation that serves as a learning resource

• Build monitoring and observability that provides real operational insight

Robust Backend Systems

• Build RESTful APIs that are intuitive, well-documented, and performant

• Create systems with deep observability built in from the ground up

• Build authentication and authorization systems

• Implement robust data validation and processing layers

• Develop the core libraries that standardize how we build features

• Build security into every layer of the application

Who you are

Essential Experience

• Expert-level modern Python programming with mastery of type annotations

• Proven experience building production systems that work at scale

• Strong architectural skills with ability to design simple solutions to complex problems

• Track record of building maintainable systems that others want to work with

• Experience setting technical standards and leading by example

Skills That Matter

• Modern Python expertise (typing, async/await, uv, ruff, Python 3.12+)

• PostgreSQL and relational database design

• FastAPI and RESTful API design

• Monorepo toolchains (e.g., moon, pants, or bazel)

• Git and collaborative development workflows

• Comprehensive testing with pytest (unit, integration, end-to-end)

• Monitoring and observability tools

• Security best practices

• Documentation and technical writing

• Fluency in English, any other languages is a plus

Mindset & Approach

• Preference for proven technology that works

• Focus on simplicity and minimizing dependencies

• Obsession with robustness and operational excellence

• Clear communication of complex concepts to diverse stakeholders

• Passion for craftsmanship and doing things right

• Ability to balance pragmatism with technical excellence

Why this role matters

You'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 offer

• Impact: Your code will power the core systems used by Europe’s most critical enterprises.

• Challenge: Solve complex problems with elegant, simple solutions

• Leadership: Set the standards for Python engineering and mentor the team

• Growth: Take on increasing ownership in a fast-evolving platform

• Collaboration: Work closely together with our Brussels team

• Compensation: Competitive salary with performance bonus and equity

• Benefits: 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 licenses

• Team: Collaborate with brilliant minds in AI

Ready 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.