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# Lead API Engineer

- **Company:** Expereo Bekijk Alle Vacatures
- **Location:** Amsterdam, Netherlands
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** .NET Framework, Application Programming Interfaces (APIs), Artificial Intelligence, Amazon Web Services, Application Integration Architecture, User Authentication, C Sharp (Programming Language), Software as a Service, Code Review, Python (Programming Language), Enterprise Messaging Systems, Network Service, OAuth, OpenID, DataOps, Salesforce.Com, Software Engineering, Systems Integration, TypeScript, Management of Software Versions, Datadog, ReactJS, Backend, Containerization, Kubernetes, Enterprise Integration, Graphql, Front End Software Development, Api Design, Api Gateway, Api Management
- **Published:** May 20, 2026
- **Apply:** https://www.careerjet.nl/jobad/nldbc511dda3a359b4a78fc52b753a9e65

## About the Role

Must have

 * 5+ years of professional software engineering experience
 * Strong experience building backend systems and APIs in C#/.NET
 * Experience designing and evolving production-grade REST and/or GraphQL APIs
 * Solid understanding of API design, integration architecture, and scalable backend engineering
 * Familiarity with API gateways, OAuth2/OIDC-based authentication and authorization patterns, and observability tooling
 * Experience working in AWS-based environments
 * Experience integrating with SaaS platforms and external systems
 * Strong understanding of software engineering fundamentals, maintainability, and operational reliability
 * Comfortable working in collaborative engineering environments with shared ownership
 * Pragmatic engineering mindset with a strong focus on delivering maintainable solutions

Strong nice to have

 * Experience with TypeScript in production environments
 * Experience with Python in production environments
 * Experience integrating with Salesforce ecosystems
 * Experience with asynchronous and event-driven integration patterns
 * Experience with messaging systems or queue-based architectures
 * Experience with containerized workloads and Kubernetes
 * Experience with frontend application development using React and TypeScript, with an understanding of how frontend and API design influence each other
 * Exposure to telecom, connectivity, CPaaS, or network-as-a-service domains
 * Interest in automation, AI-assisted workflows, or data-oriented platform capabilities

## Description

We are looking for a Lead API Engineer to help design and evolve the API and integration landscape behind a modern connectivity and network services platform.
This role is primarily hands-on engineering with additional ownership around API design, integration architecture, and cross-team engineering standards. You will work across greenfield platform capabilities and selected modernization efforts, building scalable backend systems and integrations that connect internal platforms, external providers, and business-critical systems.
You will operate in a polyglot environment centered around C#/.NET, TypeScript, and Python, with Salesforce playing an important role in the broader systems landscape. Our infrastructure stack is AWS-based and strongly API-driven, with both REST and GraphQL playing important roles across the platform.
We are looking for a pragmatic senior engineer who combines strong implementation capability with architectural judgment and product awareness., * Design, build, and maintain APIs and backend systems using C#/.NET, TypeScript, and related technologies

 * Help shape and evolve API standards, integration patterns, and engineering best practices across teams
 * Design and implement REST and GraphQL APIs that support both platform integrations and frontend application experiences
 * Build integrations between internal systems, external providers, and Salesforce-based business workflows
 * Contribute to API lifecycle management, including versioning, authentication and authorization, observability, security, and reliability
 * Collaborate closely with product, platform, and engineering teams to shape practical technical solutions
 * Participate in architectural discussions and technical decision-making
 * Contribute to both greenfield development and modernization of existing systems
 * Mentor engineers through technical guidance, design discussions, and code reviews


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