API Engineer - Envoy

API Engineer - Envoy

Location: Glasgow - 5 days onsite
Contract: 6 months
Rate: £425 per day
IR35: Inside IR35
Experience: Banking/Financial Services essential

We are urgently looking for an experienced API Engineer with strong hands-on Envoy Proxy/Envoy Gateway experience to join a major banking technology programme in Glasgow.

This is a specialist API engineering role, so candidates must have proven practical experience with Envoy rather than simply general API, Kubernetes or DevOps exposure.

Key Responsibilities

• Design, configure and support Envoy Proxy/Envoy Gateway within a cloud-native banking environment.
• Configure and manage API routing, services, upstreams and gateway policies.
• Troubleshoot complex API routing, connectivity and Proxy issues.
• Implement API authentication and authorisation at gateway level.
• Support secure and highly available API gateway architectures.
• Work with engineering and platform teams on Kubernetes-based API infrastructure.
• Manage API gateway configuration through controlled, automated deployment processes.
• Contribute to CI/CD, infrastructure-as-code and cloud-native engineering practices.

Essential Experience

• Strong hands-on Envoy Proxy or Envoy Gateway experience - essential
• Strong Java or Golang development experience
• Strong REST API experience
• OpenAPI Specification (OAS) experience
• API gateway authentication and authorisation
• OAuth 2.0/OIDC
• JWT validation
• mTLS
• Kubernetes/cloud-native environments
• Terraform
• CI/CD pipelines
• Git-based development and configuration management
• Strong troubleshooting and production support experience
• Banking or financial services experience

Desirable

• Envoy xDS/ADS
• Envoy filters and extensions
• ext_authz
• API gateway security policies
• AWS experience
• Docker
• GitOps/configuration-as-code
• Kong or other API Gateway experience

Important

Strong Envoy experience is a key requirement for this position. We are not looking for candidates with only generic API Gateway, Kubernetes or DevOps experience.