Lead Integration Engineer

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 by delivering secure, reliable, high‑performance integration solutions. This hands‑on technical leadership role shapes how integrations are designed, built, automated, and scaled across the business. You’ll drive innovation, champion AI‑enhanced engineering practices, mentor teams, 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

• Define and lead the strategy, design, and delivery of integration solutions that connect applications, services, and organisational data.

• Architect, develop, and maintain integration solutions using the Microsoft technology stack, ensuring performant data flows, system compatibility, and scalable operations.

• Implement and advocate for modern integration patterns—including microservices, API‑led connectivity, event‑driven architectures, and pub/sub models—to build resilient, future‑ready solutions.

• Provide technical direction, oversee solution architecture, and manage the full lifecycle of integration platforms across the business.

• Champion modern engineering practices to ensure robust, flexible, secure integration ecosystems.

• Mentor engineers and guide teams in delivering high‑quality, reliable integration outcomes, promoting best practices, continuous improvement, and technical excellence.

What We’re Looking For

• Strong hands‑on experience with .NET (C#) for building APIs, microservices, and integration components.

• Proficiency with Azure Integration Services: Logic Apps, API Management, Service Bus, Event Grid.

• Experience with microservices, containers (Docker), and AKS.

• Familiarity with CI/CD and Git in Azure DevOps.

• Strong understanding of integration patterns: pub/sub, event‑driven, request/response, API‑led connectivity, batch.

• Knowledge of SQL Server, non‑relational databases, and messaging/serialization formats (JSON, XML, Avro).

• Strong grounding in security best practices: OAuth2, JWT, TLS, API security.

• Excellent problem‑solving skills for complex integration scenarios.

• Strong communicator, able to translate technical detail into business impact.

• Collaborative, proactive, and adaptable, with a passion for mentoring and driving innovation.

• Commitment to AI‑enhanced, secure, reliable, high‑performance engineering.

• Demonstrable Financial Services experience

Our behaviours

At Just you’ll have the opportunity to develop your career, whilst making a difference to the lives of those around you. You’ll be part of a company with a strong and distinctive culture - we’re ambitious, curious and collaborative – and every decision we make centres around being Just and delivering the best outcomes for our customers.

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.

Belonging at Just 

Valuing diversity of thought and fostering a sense of belonging is critical to our business success, driving innovation and balanced decision making. Our work on DEIB (Diversity, Equity, Inclusion and Belonging) aims to deliver a brilliant employee experience underpinned by a sense of belonging, where our people feel proud to work at Just.  

We remain committed to our publicly disclosed HM Treasury Women in Finance Charter and Race at Work Charter targets and support a wide range of employee network and events, championing issues including intergenerational working, social mobility and neurodiversity. 

Application details 

Please submit your CV using the 'apply now’ button. Shortlisted candidates will be contacted regarding next steps which may include an initial phone interview and in-person assessment.   

Be Bold. Be Brilliant. Be Just.