Lead API Engineer

Expereo; Amsterdam; Hybrid; EUR 90,000 - 130,000; Full time

Benefits offered by this job

A dynamic, international work环境 with增长

Exposure to cutting‑edge technologies

Learning and development support to

Competitive compensation and country‑s

Hybrid working

Job summary

Expereo in Amsterdam is seeking a Lead API Engineer to design and evolve our API and integration landscape behind a modern connectivity and network services platform. This role is hands‑on, with ownership around API design, integration architecture, and cross‑team engineering standards.

You will build scalable backend systems and integrations that connect internal platforms, external providers, and business‑critical systems, mentor engineers, and participate in architectural discussions to drive

Qualifications

• 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.

Responsibilities

• 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.

Skills

C#/.NET

REST APIs

GraphQL APIs

AWS

API design

OAuth2/OIDC

SaaS integrations

Observability

Collaboration

Pragmatic engineering

Tools

TypeScript

Python

React

Kubernetes

Salesforce

Job description

About the Role

Lead API Engineer to design and evolve the API and integration landscape behind a modern connectivity and network services platform. Primarily hands‑on engineering with ownership around API design, integration architecture, and cross‑team engineering standards. Build scalable backend systems and integrations that connect internal platforms, external providers, and business‑critical systems.

Key Responsibilities

• 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

Requirements

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

Benefits

• A dynamic, international work environment with growth opportunities
• Exposure to cutting‑edge technologies and large‑scale global networks
• Learning and development support to build your career in product management
• Competitive compensation and country‑specific benefits
• Hybrid working

Expereo is an Equal Opportunities employer who aims to support and celebrate every employee that comes through our doors. We respect and support all of our people regardless of background, religion, nationality, sexual orientation, age, or physical condition.