We are seeking a Senior API Consultant to support our client in creating a unified, domain-driven API layer and modernizing their digital customer experience We are seeking a Senior Consultant to help our client develop reusable API’s and to develop a solution for partner distribution.

Currently, our client's customer facing channels integrates to independently different systems, leading to duplicated efforts, slower time-to-market and inconsistent customer journeys. Hence they are introducing a shared domain based API layer. They are also replacing legacy customer facing solutions where the new solutions will be utilizing their platform and the UI will be built using React.

The challenge

• Domain-driven design: Architect and build Domain APIs that abstract the complexity of underlying systems.
• System synchronization: Ensure real-time data consistency between modern API layer and backend systems.
• Developer experience: Create APIs that are so intuitive and well-documented that frontend teams can "self-serve" and accelerate speed-to-market.

Technical requirements

• Expert .NET Skills: 5+ years of professional experience with C# and .NET.
• RESTful and event-driven architecture: A proven track record of designing "clean" REST APIs (OpenAPI/Swagger) and event-driven architecture.
• Good React knowledge for developing embedded web applications
• Azure ecosystem: Deep hands-on experience with azure, containers, service bus.
• Data mastery: Strong proficiency in Azure SQL, including schema design, performance tuning, and data mapping.
• Identity & Security: Experience with OAuth2, JWT, authorization patterns.

The "AI-Native" advantage (Nice to have)

• AI-Augmented development: Proactive use of AI tools to accelerate code generation, testing, and documentation. Agents, skills and MCP.

Soft skills & consulting mindset

• Strategic thinking: You don’t just build what is asked; you understand the "why" behind the domain and the business value.
• Collaboration & communication: Collaboration and clear communication in- and outside the team is crucial
• Pragmatism: You know how to balance "perfect architecture" with the need for "speed-to-market."

This role requires working 3 days/week at the client's office in Espoo.

If you are interested, please apply through the link below!