Senior Java Architect

Third Nexus Group Limited; City Of London; On-site; GBP 72,000 - 120,000; Full time

Job summary

Third Nexus Group Limited in London seeks a Senior Java Engineering Architect to lead the design and delivery of Banking, Payments, and AI-driven platforms.

The role demands 15+ years of software engineering and 8+ years in architecture, with expertise in Java, Spring Boot, and event-driven architectures. You will guide globally distributed teams and define strategic technology directions.

Qualifications

• 15+ years of software engineering experience.
• 8+ years in Solution Architecture or Principal Engineering roles.
• Proven experience delivering enterprise-grade Banking and Payment solutions.
• Strong leadership and executive communication skills.

Responsibilities

• Define enterprise architecture and roadmaps for banking platforms.
• Lead large backend engineering teams and oversee delivery.
• Collaborate with stakeholders to align business and tech goals.
• Leverage AI-driven development practices to accelerate delivery.

Skills

Java

Spring Boot

Spring Cloud

Microservices

Kafka

NATS

Event-driven architecture

Leadership

Tools

Oracle

PostgreSQL

Kubernetes

Job description

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