Lead API Engineer

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.

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