Job Vacancy Senior Siebel Developer

Leatherhead

CGI

Job position Senior Siebel Developer

Permanent

As soon as possible

Leatherhead, England, United Kingdom

Published on 05/05/2026

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At CGI, we are at the forefront of delivering transformative digital solutions that enable critical Defence operations and drive measurable impact. As a Siebel Developer, you will play a key role in shaping and evolving a highly customised CRM platform, contributing to innovative, high-value outcomes for our clients. You will be empowered to take ownership of complex challenges, apply creative problem-solving, and collaborate with a supportive team to deliver excellence. By combining deep technical expertise with a culture that encourages growth and accountability, you will help us continue to deliver secure, scalable, and future-focused solutions that make a real difference.

CGI was recognised in the Sunday Times Best Places to Work List 2025 and has been named a UK ‘Best Employer’ by the Financial Times. We offer a competitive salary, excellent pension, private healthcare, plus a share scheme (3.5% + 3.5% matching) which makes you a CGI Partner not just an employee. We are committed to inclusivity, building a genuinely diverse community of tech talent and inspiring everyone to pursue careers in our sector, including our Armed Forces, and are proud to hold a Gold Award in recognition of our support of the Armed Forces Corporate Covenant. Join us and you’ll be part of an open, friendly community of experts. We’ll train and support you in taking your career wherever you want it to go.

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

In this role, you will contribute to the development, enhancement, and maintenance of a highly customised Siebel CRM solution within a secure Defence environment. You will take ownership of technical deliverables, applying your expertise to design, configure, and optimise system components while ensuring alignment with established standards and best practices. Working closely with a collaborative team, you will help shape solutions that deliver real operational value and continuous improvement.

You will be encouraged to bring forward ideas, solve complex challenges, and refine system capabilities, supported by a culture that values innovation, accountability, and shared success. Your work will directly influence the performance, scalability, and reliability of critical systems.

• Develop & Configure Siebel solutions using Siebel Tools and best practices

• Design & Implement eScript, workflows, and technical components

• Integrate & Optimise systems using EAI, EIM, and cloud-based services

• Collaborate & Deliver alongside cross-functional teams and stakeholders

• Analyse & Resolve technical issues, ensuring high system performance

• Enhance & Maintain existing Siebel implementations for continuous improvement

Required qualifications to be successful in this role

To succeed in this role, you will bring strong hands-on experience in Siebel development, combined with a proactive approach to problem-solving and solution design. You will be comfortable working in secure, structured environments and able to contribute effectively within a collaborative team while taking ownership of your work.

• Strong experience in Siebel Tools configuration

• Proven expertise in Siebel eScript and workflow development

• Experience with Siebel Enterprise Application Integration (EAI) and EIM

• Solid knowledge of Oracle SQL

• Experience working with Oracle Cloud environments

• Demonstrable experience in Siebel CRM development (2017 or later preferred)

• Experience integrating Siebel with cloud infrastructure

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