Lead Integration Engineer

Date Posted: 15/10/2025

Location: London

Job Type: Full time

Lead Integration Engineer

Location: London – hybrid 50%

Contract: Permanent

Hours: 35 hours

Purpose

The Lead Integration Engineer ensures systems, applications, and services work seamlessly together, delivering secure, reliable, and high-performance integration solutions. This role combines hands-on technical expertise with leadership, shaping how integrations are designed, built, and delivered across the business. You'll drive innovation, mentor the team, and collaborate with stakeholders to solve complex integration challenges.

About Just

We help people achieve a better later life. That's our purpose and it's the reason we exist. We are a fast-growing company helping customers enjoy the retirement they deserve. We do this through a variety of market leading, award-winning products and services, delivered by a diverse team of over 1,400 purpose-led colleagues who genuinely put the customer at the heart of everything we do.

This is a brilliant time to join our business. We are on an exciting growth journey to become the UK's most loved retirement expert.

Key Responsibilities

• Direct the strategy, design, and delivery of integration solutions that connect applications, services, and organisational data.
• Lead the design, development, and maintenance of integration solutions using the Microsoft technology stack, ensuring seamless data flow, system compatibility, and scalable operations.
• Implement and champion advanced integration patterns, including microservices, API-led connectivity, event-driven architectures, and pub/sub models, to deliver resilient, future-proof solutions.
• Provide strategic direction, oversee solution design, and manage the lifecycle of integration platforms across the organisation.
• Drive the adoption of modern integration approaches to build robust, flexible, and secure systems.
• Guide and mentor teams to deliver high-quality, performant, and reliable integration outcomes while promoting best practices and technical excellence.

What We're Looking For

• Strong experience with .NET (C#) for building APIs, services, and integrations.
• Proficiency in Azure Integration Services: Logic Apps, API Management, Service Bus, Event Grid.
• Hands-on experience with microservices, Docker, and AKS.
• Familiarity with CI/CD pipelines and Git in Azure DevOps.
• Solid understanding of integration patterns: pub/sub, event-driven, API-led connectivity, request/response, batch.
• Knowledge of SQL Server and non-relational databases, plus messaging/serialization formats (JSON, XML, Avro).
• Awareness of security best practices: OAuth2, JWT, TLS, API security.
• Strong problem-solving and analytical skills for complex integration scenarios.
• Excellent communication to bridge technical and business stakeholders.
• Collaborative, proactive, and adaptable, with a focus on mentoring and driving integration innovation.
• Commitment to secure, reliable, and high-performance solutions.
• Previous experience within Financial Services

What's in it for you

• A competitive salary, pension scheme and life assurance
• 25 days annual leave plus an additional day on us for your birthday
• Private medical cover and income protection, just in case
• A generous and highly achievable bonus scheme
• Opportunities to progress your career in-role and within the company
• Free access to the Headspace app, 24/7 employee assistance helpline and trained physical and mental health first aiders
• A variety of employee funded benefits available via our online benefits portal
• Plus, several additional purchase options available for you and your loved ones

Explore our full range of benefits on our dedicated benefits page.

Be Bold. Be Brilliant. Be Just.