Full Stack/API Integration Engineer

Lorien
Charing Cross, United Kingdom
yesterday

Role details

Contract type
Permanent contract
Employment type
Full-time (> 32 hours)
Working hours
Regular working hours
Languages
English
Experience level
Intermediate

Job location

Remote
Charing Cross, United Kingdom

Tech stack

Java
API
Amazon Web Services (AWS)
Software as a Service
Learning Management Systems
Data Mapping
Data Mining
Fault Tolerance
OAuth
Message Oriented Middleware
Data Streaming
Systems Integration
Enterprise Software Applications
Spring-boot
Gitlab
REST
Amazon Web Services (AWS)
Webhooks
Api Management
Workday

Job description

Integration Engineer - API & Enterprise Systems (Contract)

Contract Length: 6 months Location: UK - based anywhere/Remote Sector: Retail Banking

We are seeking an experienced Integration Engineer to support the delivery and long-term operation of critical enterprise integrations within a retail banking environment. This role is hands-on and delivery-focused, with responsibility transitioning into the Run phase as the integration subject matter expert. Key Responsibilities

  • Build and maintain secure, scalable API integrations using REST, OAuth2, webhooks, and asynchronous messaging patterns
  • Design and implement integrations using Java and Spring Boot, developing robust integration adapters and services
  • Integrate with enterprise platforms such as:
  • Workday APIs (HCM and Talent modules)
  • GitLab APIs (commit and activity data extraction)
  • LMS/training platforms or similar SaaS systems
  • Implement reliable data flows including:
  • Data mapping and transformation
  • Error handling and retry strategies
  • Dead letter queue (DLQ) patterns
  • Work with AWS messaging services such as SQS and EventBridge
  • Support the transition from delivery into Run, acting as the integration SME and providing knowledge transfer to wider teams
  • Collaborate closely with product, platform, and operations teams to ensure integrations are supportable and compliant

Required Experience

  • 3+ years' experience delivering API-led integrations
  • Strong experience with REST APIs, OAuth2, webhooks, and asynchronous messaging
  • Hands-on Java/Spring Boot experience building integration services
  • Enterprise system integration experience (Workday, GitLab, LMS, or similar)
  • Strong understanding of integration resilience patterns (retry, DLQ, fault tolerance)
  • Experience working in a regulated environment (retail banking or financial services preferred)

Guidant, Carbon60, Lorien & SRG - The Impellam Group Portfolio are acting as an Employment Business in relation to this vacancy.

Requirements

  • 3+ years' experience delivering API-led integrations
  • Strong experience with REST APIs, OAuth2, webhooks, and asynchronous messaging
  • Hands-on Java/Spring Boot experience building integration services
  • Enterprise system integration experience (Workday, GitLab, LMS, or similar)
  • Strong understanding of integration resilience patterns (retry, DLQ, fault tolerance)
  • Experience working in a regulated environment (retail banking or financial services preferred)

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