Senior Java Architect

Third Nexus Group Limited

Senior Java Engineering Architect – Banking, Payments & AI-Driven Engineering

London / (4 days/week from office; 1 day/week from home)

Contract or Perm

£120Kpa or £500pd (Inside IR35)

Role Summary

We are seeking a highly experienced Java Engineering Architect to lead the architecture, design, and delivery of next-generation Banking and Payment platforms. The ideal candidate will have deep expertise in payment engines, banking operations, messaging architecture, integration patterns, cloud-native engineering, and AI-driven software delivery.

This role requires a strong technology leader who can define enterprise architecture, drive engineering excellence, lead large backend engineering teams, and leverage AI-powered development practices to accelerate software delivery and innovation.

​​​​​​​Required Skills & Experience

Core Architecture

  • 15+ years of software engineering experience.
  • 8+ years in Solution Architecture, Enterprise Architecture, or Principal Engineering roles.
  • Proven experience delivering enterprise-scale Banking and Payment solutions.

Java & Backend Engineering

  • Expert-level knowledge of: Java, Spring Boot, Spring Cloud, Microservices

Messaging & Integration

Deep expertise in Messaging Hub architecture.

  • Strong experience with: Kafka, NATS, Event Streaming Platforms
  • Expert understanding of: Integration patterns, Enterprise Integration Architecture, Messaging patterns, API architecture, Event-driven architecture

Databases

  • Strong expertise in: Oracle, PostgreSQL
  • Data modelling, performance tuning, HA/DR architecture, and transaction-heavy systems.

Leadership & Communication

  • Exceptional stakeholder management and executive communication skills.
  • Ability to influence senior leadership and engineering organizations.
  • Strong architectural documentation and presentation capabilities.
  • Experience leading globally distributed teams.
  • Strategic thinker with a hands-on engineering mindset.

Preferred Qualifications

  • Banking or Financial Services industry background.
  • Experience with large-scale modernization and transformation programs.
  • TOGAF, Kubernetes, Cloud, or Architecture certifications.
  • Experience building AI-enabled engineering organizations.
  • Exposure to GenAI and Enterprise LLM integration patterns.
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