Senior Java Architect

Third Nexus Group Limited; Greater London; On-site; GBP 102,000 - 138,000; Full time

Job summary

Third Nexus Group Limited seeks a Senior Java Engineering Architect in London to lead architecture, design and delivery of Banking, Payments and AI-driven platforms. The role demands hands-on leadership of large backend teams and enterprise-scale implementations.

The ideal candidate has 15+ years in software engineering, 8+ years in architecture roles, and deep Java/messaging/data/cloud expertise, including AI-enabled development practices.

Qualifications

• 15+ years of software engineering experience.
• 8+ years in solution/enterprise architecture roles.
• Proven experience delivering enterprise-scale Banking and Payment solutions.
• Strong leadership and stakeholder management and executive communication skills.

Responsibilities

• Define and drive enterprise architecture across banking and payments platforms.
• Lead large backend engineering teams to deliver scalable solutions.
• Leverage AI-enabled development practices to accelerate delivery and innovation.
• Communicate architectural vision to senior leadership and stakeholders.

Skills

Software engineering

Solution architecture

Leadership

Executive communication

Distributed teams

Education

TOGAF certification

Tools

Java

Spring Boot

Spring Cloud

Microservices

Kafka

NATS

Oracle

PostgreSQL

Kubernetes

Cloud technologies

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