- Senior Java Engineer (Outside IR35) – Kafka & Spring Boot

JR United Kingdom; London; On-site; GBP 70,000 - 100,000; Full time

Job summary

A leading company in London is seeking a Senior Java Engineer to design and develop secure, distributed systems using Kafka and Spring Boot. Join an innovative team focused on real-time communication platforms, where you'll work flexibly and contribute to impactful projects. Enjoy a supportive culture and autonomy in your role.

Benefits

Flexible office attendance

Competitive salary and equity

Direct access to decision-makers

Qualifications

• 10+ years as a backend/systems engineer with Java.
• Proven experience designing Kafka systems at scale.
• Mastery of Spring Boot required.

Responsibilities

• Architect and build event-driven microservices using Java, Spring Boot, Kafka.
• Design and deliver APIs with frontend and AI colleagues.
• Mentor peers and ensure high code quality.

Skills

Java

Kafka

Spring Boot

Observability

Event-driven systems

Tools

CI/CD tools

Infrastructure as Code (IaC)

Containerisation

Job description

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? Senior Java Engineer (Outside IR35) – Kafka & Spring Boot, london

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Client:

Pixelated People

Location:

london, United Kingdom

Job Category:

Other

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EU work permit required:

Yes

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Job Views:

3

Posted:

10.06.2025

Expiry Date:

25.07.2025

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Job Description:

About the Client

We’re working with an innovative team building the next generation of secure, real-time communication and data platforms. Their flagship product is a fresh reimagining of an existing system, crafted to provide robust, distributed coordination for a wide range of uses – from emergency response and humanitarian logistics to private collaboration and secure deployments in highly regulated or sensitive contexts.

Location & Flexibility

Office attendance is flexible. Come in as much or as little as you like. They have a well-equipped London office if you’d like a change of scene, but in-person attendance is only occasionally required for team meetups or workshops – always with advance notice.

The Role

We’re looking for a Senior Java Engineer who thrives in the world of Kafka and Spring Boot. You’ll play a key role in crafting a secure, distributed backend system designed for real-time operations and maximum resilience. You’ll team up with infrastructure, AI, and frontend specialists to create reliable backend services that keep people and teams connected when it matters most.

• Architect and build event-driven microservices using Java, Spring Boot, and Kafka
• Be responsible for the backend engineering for secure, distributed real-time systems
• Design and deliver rock-solid APIs in collaboration with frontend and AI colleagues
• Seamlessly integrate with identity and access management tools (like Keycloak)
• Champion observability best practices through effective logging, metrics, and tracing
• Pitch in on architecture decisions and mentor your peers to keep code quality top-notch

What You’ll Bring ?

• 10+ years of experience as a backend or systems engineer working with Java
• Proven track record of designing and running Kafka-based systems at scale
• Mastery of the Spring Boot ecosystem, including modules for Security, Web, and Data
• Expertise in building event-driven systems that deliver high reliability and performance
• Familiarity with message schemas (Avro, Protobuf) and strategies for evolving events
• Experience integrating with identity systems like Keycloak
• Strong grasp of system-level concerns like observability, availability, and resilience
• Background working in secure, regulated, or mission-critical environments
• Comfortable working with CI/CD pipelines, IaC tools, and containerised deployments

Security Clearance

This role requires the ability to gain UK SC clearance. If you’re eligible, they’ll support and fast-track your clearance. If you already have it then even better.

Bonus Points If You’ve Worked With:

Zero-trust or encrypted transport architectures

Why Join? ?

• Contribute to a mission-driven product that makes a real-world impact
• Work in a high-trust, supportive engineering culture
• Enjoy flexibility and autonomy – your work, your way
• Competitive salary and equity
• Direct access to decision-makers and a say in shaping the future of the platform

Ready to build something that matters? Please apply ?

At Pixelated People, we don’t just do inclusion and diversity. We embrace people that have different opinions, perspectives and personalities. Because we believe that by seeing the world from all sorts of angles, we can make life better for all the people who live in it. So we want you to know that the things that make you, you — like your age, ability, background and identity — are things that we celebrate and support.