Senior Java Developer

WARACLE; Glasgow; Hybrid; GBP 100,000 - 125,000; Full time

Job summary

A digital technology consultancy in Glasgow is seeking a Senior Java Developer for a hybrid role focused on transitioning a Java 17 monolith into microservices. You will deliver backend services, apply security standards, and optimize performance. The ideal candidate has deep Java expertise and strong communication skills. This is an exciting opportunity to play a pivotal role in a high-priority migration project, working collaboratively with other developers and guiding testing strategies.

Qualifications

• Deep experience in Java 17 and microservices, particularly event-based systems.
• Strong understanding of OWASP, GDPR, and SOC2.
• Proven experience in optimizing application performance.
• Ability to design and guide comprehensive testing strategies.
• Excellent communication and presentation skills.

Responsibilities

• Deliver end-to-end backend microservices to replace monolithic structures.
• Apply defensive security measures to maintain robust standards.
• Guide the testing strategy across unit, integration, and service levels.
• Partner with Scrum Masters and Frontend Developers.
• Explain complex technical concepts to client stakeholders.

Skills

Java 17

Microservices

Event-based systems

OWASP

Performance optimization

Testing strategies

Communication skills

Job description

Waracle are looking for a Senior Java Developer for an exciting new contract role joining our world‑class digital technology consultancy and home to a diverse, smart, curious and ambitious community of specialists in technology‑driven transformation.

We work with ambitious clients to help them solve their biggest business and customer challenges. We help our clients to innovate and create intelligent digital products and services. We thrive on complex challenges and deliver business‑critical IT transformation projects, moving seamlessly from strategy, design and delivery to operations.

This is a Hybrid role working from our Glasgow office 2 days a weekand is an Inside IR35 contract role.

The Opportunity

Are you a thoughtful problem‑solver who enjoys deconstructing complex systems to build something better? We are seeking a collaborative Senior Java Developer to play a pivotal role in a high‑priority migration project. You will focus on transitioning a Java 17 monolith into a modern microservices architecture, using event‑based processing to streamline data handling. This is a fantastic chance to act as a "guardian of quality," ensuring backend code is modular, reusable, and scalable while working within a supportive team of developers and consultants.

Key aspects of the role include:

• Architectural Migration: Delivering end‑to‑end backend microservices to replace monolithic structures.
• Quality & Security: Applying defensive security measures (OWASP) to maintain robust, high‑performance standards.
• Technical Strategy: Guiding the testing strategy across unit, integration, and service levels.
• Collaborative Delivery: Partnering with Scrum Masters and Frontend Developers to evaluate trade‑offs between speed and quality.
• Stakeholder Communication: Explaining complex technical concepts in plain language and presenting confident demos to client stakeholders.

What you’ll bring

We value diverse perspectives and are looking for individuals who bring both technical depth and a team‑oriented mindset.

• Backend Expertise: Deep experience in Java 17 and microservices, particularly event‑based systems.
• Security & Compliance: A strong understanding of OWASP, GDPR, and SOC2.
• Performance Mindset: Proven experience in optimising application performance, including query tuning and threading.
• Testing Leadership: The ability to design and guide comprehensive testing strategies.
• Communication Skills: Excellent organisational and presentation skills, with a talent for engaging with a wide variety of people.

The recruitment process you can expect for this role is an initial call with your dedicated Talent Acquisition Partner who will chat with you about Waracle, what you are looking for in a new position, the salary for the role, notice period and benefits (the important stuff!).

After that, you’ll be invited to a two‑stage interview process where you have an opportunity to find out more about the role and showcase your skills and experience. Your Talent Acquisition Partner will guide you through the whole process to your first day with us.