Job Vacancy Senior Siebel Developer

Leatherhead

CGI

Job position Senior Siebel Developer

Permanent

As soon as possible

Leatherhead, England, United Kingdom

Published on 24/05/2026

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CGI's Space, Defence and Intelligence business unit delivers complex, mission-critical systems that help keep the UK safe and secure. As a leading systems integrator, we design, build and operate innovative solutions for clients across defence, intelligence, aerospace, maritime and space sectors.

We combine deep technical expertise with modern delivery approaches and strong partnerships across industry and academia. Our teams work on challenging projects where technology makes a real-world difference.

At CGI, you'll be part of a collaborative and supportive community that values innovation, continuous learning and professional growth. We offer a competitive salary, excellent pension, private healthcare and our share purchase plan, making you a CGI Partner rather than simply an employee.

Due to the secure nature of the programme, you will need to hold UK Security Clearance or be eligible to go through this clearance. This is a hybrid position with travel to our Leatherhead office.

Candidate profile

We are looking for an experienced Siebel Developer to join a growing team supporting a highly customised, business-critical solution for a major Defence client.

This is a hands-on technical role where you will contribute to the ongoing development, enhancement and support of a complex Siebel environment while helping to shape future improvements and technical direction.

As a senior member of the team, you will work closely with developers, architects, analysts and client stakeholders to deliver high-quality solutions and resolve complex technical challenges. You will also play an important role in supporting and mentoring less experienced developers, helping to build capability across the team and promote development best practices.

Key responsibilities include:

• Designing, developing and enhancing Siebel CRM solutions

• Configuring and customising Siebel applications to meet business requirements

• Developing workflows, integrations and automation solutions

• Troubleshooting and resolving technical issues within a complex environment

• Collaborating with technical and business stakeholders to identify effective solutions

• Supporting integration with Oracle and cloud-based technologies

• Contributing to technical design discussions and continuous improvement initiatives

• Coaching and supporting junior developers within the team

Required qualifications to be successful in this role

• Strong experience developing and configuring Siebel CRM solutions

• Siebel Tools configuration experience

• Siebel eScript development

• Siebel Workflow development

• Oracle SQL & PL/SQL

• Siebel Open UI

• Siebel assignment manager

• Middleware connectivity/integration

• Experience working with enterprise-scale applications and integrations

• Strong analytical and problem-solving skills

• Ability to work collaboratively within a multidisciplinary team

Desirable

• Experience with Siebel Enterprise Application Integration (EAI)

• Experience with Enterprise Integration Manager (EIM)

• Linux/Unix environment experience

• Oracle Cloud experience

• Experience integrating applications with cloud-based infrastructure

• Experience working in secure, regulated or government environments

• Current SC clearance

#LI-SB2

Working environment

Together, as owners, let’s turn meaningful insights into action.

Life at CGI is rooted in ownership, teamwork, respect and belonging. Here, you’ll reach your full potential because…

You are invited to be an owner from day 1 as we work together to bring our Dream to life. That’s why we call ourselves CGI Partners rather than employees. We benefit from our collective success and actively shape our company’s strategy and direction.

Your work creates value. You’ll develop innovative solutions and build relationships with teammates and clients while accessing global capabilities to scale your ideas, embrace new opportunities, and benefit from expansive industry and technology expertise.

You’ll shape your career by joining a company built to grow and last. You’ll be supported by leaders who care about your health and well-being and provide you with opportunities to deepen your skills and broaden your horizons.

Come join our team—one of the largest IT and business consulting services firms in the world.

Discover CGI

London, England, United Kingdom

> 1000 employees

IT services

We are a global business with 91,500 professionals across hundreds of locations worldwide, providing end-to-end IT and business process services that drive our clients’ businesses. In the UK alone, we have around 6,000 member-partners working across 19 towns and cities, doing everything from writing complex code to designing sophisticated software solutions. The work we do powers some of the most ambitious projects that touch the lives of many. Our approach sets us apart, characterised by our proximity model, international presence, expertise, and operational excellence. We organise our operations within metro markets where our clients have concentrated footprints, empowering our local teams to build trusted, in-person relationships. As you build your career here, you’ll develop your skills, share your insights, and work side-by-side with colleagues and clients on innovative solutions that address the most complex issues. Our commitment to ownership, flexibility, and being approachable makes us easy to do business with. Join us, and together, as owners, let’s turn meaningful insights into action to meet the needs and balance the interests of our clients, shareholders, communities, and each other. Benefits: - Insurance coverage - Medical benefits - Pension plan - Member Assistant Programme - Check4Cancer - Flexible time off - Share Purchase Plan - Member discounts - Dental benefits - Vision benefits - Profit Participation Plan - Health and Wellbeing Programme

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Senior Siebel Developer

CGI