Software Engineer - Core

About Biolevate builds AI-powered software that turns unstructured scientific data into reliable, collaborative workflows for medical writing and regulatory work. Our platform helps scientists, clinicians and medical writers move faster while maintaining the rigor their work demands. Founded in Paris in 2024, we combine a commercial SaaS platform with in-house research in oncology and dermatology. It is an unusually practical place to work on AI: the systems we build are used both to advance scientific research and to help bring therapies to patients faster. Why this role exists Biolevate is building a cloud-native platform that supports a suite of applications for scientific work. At its core are the shared systems that make those applications possible: our knowledge base, agent-orchestration layer and reproducible workflow infrastructure. We are hiring a Software Engineer - Core to build and evolve these foundational capabilities. You will work on technically challenging systems with a direct connection to our roadmap, making the architectural decisions and engineering investments that enable reliable, scalable and high-quality product experiences over the long term. What you’ll own Design, build and operate core services and platform capabilities used across Biolevate’s applications.Develop and evolve systems such as our knowledge base, agent-orchestration layer and reproducible workflow infrastructure.Define and implement robust interfaces, APIs and data flows between core systems, AI services and product applications.Make sound architectural trade-offs across reliability, performance, security, scalability and long-term maintainability.Work closely with Product, AI, Platform and Product Engineering teams to translate roadmap needs into durable technical foundations.Improve engineering quality through strong testing, observability, traceability and operational practices.Contribute to technical direction and help raise the bar for code ownership and engineering excellence across the team. What success looks like After 3 months, you will have: Developed a strong understanding of Biolevate’s architecture, core systems and product roadmap.Shipped meaningful improvements to an existing core capability with support from the team.Established productive working relationships across Platform, AI and Product Engineering. After 6 months, you will have: Taken ownership of a substantial core service, system or technical domain.Delivered capabilities that make product teams faster, systems more reliable or workflows more reproducible.Improved a part of our technical foundations, such as service architecture, API design, testing, observability, performance or security. What will help you succeed Strong experience building and operating backend or distributed systems in production.Comfort designing reliable, maintainable services and APIs in a complex architecture.Experience working with one or more of Go, Python or Java, or an ability to learn and contribute quickly in these environments.Sound understanding of data flows, asynchronous processing, service-to-service communication and failure modes.A thoughtful approach to engineering quality: testing, observability, traceability, security and performance matter to you.Ability to work from an ambiguous technical or product problem through design, implementation, release and iteration.Ability to explain technical trade-offs clearly and collaborate closely with engineers across disciplines.Professional working proficiency in English. You could be an especially great fit if… You have worked on cloud-native, microservices-based systems.You have experience with Kubernetes, Protobuf, gRPC, Temporal or comparable technologies.You have built workflow orchestration, data-platform, knowledge-management or AI-agent systems.You have worked on reproducibility, auditability or traceability in a regulated or high-stakes technical environment.You have experience improving the shared engineering foundations of a growing product organisation.You enjoy contributing to architecture and technical strategy, not only implementing isolated features. You might thrive in this role if… You enjoy solving deep technical problems that have a visible impact on users and the product roadmap.You think beyond the immediate delivery and care about building systems that will remain useful as the company scales.You are comfortable with ownership and ambiguity, and know when to seek input rather than work in isolation.You enjoy collaborating across Platform, AI and Product Engineering.You want your work to have tangible impact in healthcare and scientific research. Our engineering environment Biolevate is built on a complex, cloud-native microservices architecture. Our engineering environment is organised around three complementary layers: Platform: shared foundations for observability, testing, traceability, security and reliable delivery across the company.Core systems: highly technical capabilities, including our knowledge base, agent-orchestration layer and reproducible workflow infrastructure.Applications: the business-facing tools that bring these capabilities to users, such as our editor, table and assistant. Our stack includes Kubernetes, Go, Python and Java on the backend, with Next.js and TypeScript on the frontend. We use technologies such as Protobuf, gRPC and Temporal to build reliable, scalable systems and workflows. The stack is representative rather than exhaustive. We care more about your ability to learn, make sound trade-offs and build robust products than about a perfect match with every tool we use. What we offer A meaningful role in a company working to accelerate scientific progress and the development of therapies.Stock options, alongside a salary range that will be shared early in the process.A hybrid working setup based in Paris, at Station F, with flexibility according to the team’s needs.Meal vouchers and the equipment you need to do your best work, including a recent MacBook.An international, collaborative team where engineers can influence product direction and technical decisions.Team moments, offsites and a work environment built around respect, openness and constructive feedback. Hiring process We aim to make the process clear, respectful and efficient. We will share the compensation range at the beginning of the process and keep you informed throughout. CV screening : We review your experience and application against the role’s core requirements.Hiring Manager interview - 30 minutes : A conversation about the role, product context, your experience, expectations and compensation.Take-home technical exercise : A focused exercise based on a problem relevant to the role. We will share clear instructions and the expected time commitment in advance.Exercise presentation & role-specific technical interview - 1 hour : You will present and discuss your exercise with an engineer, followed by a technical discussion tailored to the role. Depending on the position, this may focus on system design, product and technical trade-offs, architecture, reliability, or other relevant engineering topics.Values & collaboration interview - 45 minutes : A conversation with two people from other teams about how you work. We will share the topics in advance.Final interview with a founder - 30 minutes : For shortlisted candidates.Administrative step : Final offer, compensation, start date and remaining formalities. Equal opportunity, accessibility and data privacy Biolevate welcomes applications from people of all backgrounds. We assess candidates based on their skills, experience, potential and role fit, without discrimination. If you need an adjustment during the hiring process, please let us know and we will do our best to support you. We process candidate data for recruitment purposes in accordance with applicable data-protection regulations, including the GDPR. For more information, please see our Data Protection Notice or contact us at jobs@biolevate.com.