Integration Architect

Company: Third Nexus Group Limited
Apply for the Integration Architect
Location: London
Job Description:

Salary: £85,000 – 120,000 per year

Requirements

  • 15+ years of experience in technology
  • 5+ years of experience in integration architecture
  • Proven delivery experience in large-scale financial or fintech systems
  • Hands‑on experience with event‑driven architecture
  • Hands‑on experience with NATS, or Kafka/Pulsar accepted
  • Strong integration expertise with a cloud‑native mindset
  • Experience leading multi‑team integrations
  • Strong stakeholder management capability
  • Hands‑on experience in backend technologies such as Java, Spring Boot, microservices, REST, and gRPC
  • Working knowledge of AWS services such as EKS, ECS, SQS, SNS, API Gateway, and Terraform
  • Familiarity with OpenAPI, AsyncAPI, API versioning, and governance
  • Working knowledge of React and TypeScript
  • Banking domain experience, ideally in real‑time ledger, payments, FX, risk/limit management, or client onboarding
  • Strong communication and technical leadership skills
  • Familiarity with AI‑assisted development tools

Responsibilities

  • Define and own the target‑state integration architecture aligned with enterprise standards
  • Lead end‑to‑end integration delivery across multiple systems and teams
  • Design event‑driven, API‑first, cloud‑native solutions using NATS, REST, and async messaging
  • Create architecture artefacts including blueprints, APIs, and ADRs
  • Act as the integration authority across platforms and stakeholders
  • Mentor teams on integration patterns, API governance, and best practices
  • Drive the use of AI tools to improve development efficiency
  • Support real‑time ledger, payments, and FX systems integration within a large banking platform

Technologies

  • AI
  • API
  • AWS
  • Architect
  • Backend
  • Cloud
  • Support
  • Java
  • Kafka
  • NATS
  • OpenAPI
  • REST
  • React
  • Spring
  • Spring Boot
  • Terraform
  • TypeScript
  • gRPC
  • microservices
  • Frontend
  • Swift

We are hiring an Integration Architect for a London‑based hybrid role with 4 days in the office on a fixed‑term 1‑year contract, offering a salary of £85,000 to £120,000 per annum. We are looking for a hands‑on technical leader to help shape and deliver integration across a large banking platform, with a strong focus on real‑time ledger, payments, and FX systems. This role sits in a cloud‑native, event‑driven environment and offers the opportunity to work across enterprise‑scale financial systems while collaborating closely with multiple teams and stakeholders.

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Posted: July 7th, 2026