Senior Software Engineer / Technical Lead (C++ Middleware & Interfaces)

About Capgemini

Capgemini is an AI-powered global business and technology transformation partner, delivering tangible business value. We imagine the future of organizations and make it real with AI, technology and people. With our strong heritage of nearly 60 years, we are a responsible and diverse group of over 420,000 team members in more than 50 countries. We deliver end-to-end services and solutions with our deep industry expertise and strong partner ecosystem, leveraging our capabilities across strategy, technology, design, engineering and business operations. The Group reported 2025 global revenues of €22.5 billion.

About the Role

Lead the technical delivery of a customised C++ middleware solution for a customer environment. The role is responsible for translating customer and system requirements into a robust software architecture, managing day-to-day software-development activities, and ensuring the delivered interfaces are reliable, testable, maintainable, and suitable for integration into the customer’s wider system. This role shall also participate in the software development after the design phase.

Responsibilities

• Lead the design, development, integration, and verification of customised middleware and software interfaces in C++.
• Act as the technical focal point for the software work package, coordinating software tasks, priorities, estimates, risks, and delivery milestones.
• Analyse customer, system, interface-control, and operational requirements; derive clear software requirements and acceptance criteria.
• Define the middleware architecture, including interface abstractions, data models, message formats, protocol handling, error handling, logging, configuration, and service lifecycle management.
• Design and implement C++ components for inter-system communications, data translation, protocol conversion, message routing, and interface monitoring.
• Review interface specifications and work with customers, internal engineering teams, and third-party suppliers to resolve technical ambiguities and integration issues.
• Establish and maintain software engineering practices, including coding standards, branching strategy, code reviews, build management, unit testing, static analysis, and version control.
• Plan and supervise the Junior Software Engineer’s work, provide technical guidance, conduct code reviews, and support capability development.
• Develop software design documents, interface descriptions, test procedures, release notes, installation guides, and technical reports.
• Define and execute unit, integration, system, and acceptance testing; investigate defects and support root-cause analysis.
• Support software installation, deployment, commissioning, customer demonstrations, site integration, and post-delivery defect resolution where required.
• Identify technical, schedule, cybersecurity, obsolescence, and integration risks, and propose practical mitigation actions.
• Ensure developed software complies with applicable customer requirements, project processes, quality procedures, and cybersecurity expectations.

Requirements

• Degree in Computer Science, Computer Engineering, Electrical/Electronic Engineering, or a related technical discipline.
• At least 5 years of professional software-development experience, including substantial experience in C++.
• Demonstrated experience delivering production-quality C++ software for distributed, embedded, industrial, maritime, defence, communications, automation, or other integration-heavy systems.
• Experience designing middleware, software interfaces, communications gateways, protocol adapters, or data-integration solutions.
• Strong understanding of modern C++ principles and practices, ideally C++11 or later.
• Experience with Linux-based development environments, including command-line troubleshooting, process/service management, file permissions, networking tools, and log analysis.
• Experience with Git and structured software configuration management.
• Experience with software debugging, profiling, automated testing, and defect investigation.
• Ability to interpret interface control documents, protocol specifications, data dictionaries, and system requirements.
• Strong written and verbal communication skills, including the ability to produce clear technical documentation and engage directly with customers and multidisciplinary engineering teams.

Preferred Qualifications and Experience

• Experience with TCP/IP, UDP, multicast, serial communications, REST APIs, RPC, publish-subscribe architectures, or message-oriented middleware.
• Experience with data formats such as JSON, XML, YAML, CSV, Protocol Buffers, ASN.1, or binary message formats.
• Experience with CMake, Make, Conan, vcpkg, Docker, CI/CD pipelines, or automated build/test environments.
• Familiarity with cybersecurity practices for software and networked systems, including secure coding, authentication, access control, certificate handling, vulnerability management, and audit logging.
• Experience in regulated, safety-critical, high-availability, maritime, defence, industrial, or customer-acceptance environments.
• Prior experience technically leading a small team or mentoring junior engineers.
• The Junior Software Engineer is effectively guided and contributes independently to defined development work packages.
• Customer and internal stakeholders receive timely, clear technical updates and well-managed issue resolution.

Let's talk about what's in it for you!

Passionate people are Capgemini's Ace of Spades - join us to discover a career that will challenge, support and inspire you. Working at Capgemini you'll find the rewards are more than just financial. You will work alongside some very smart and inspiring people on exciting projects and you will also enjoy incredible benefits. We offer flexible work practices and 40 hours of self-development every year with a huge selection of learning opportunities to choose from.

As 'Architects of Positive Futures', Capgemini actively supports the community in 3 ways:

Diversity and Inclusion - we believe diversity of thought fuels excellence and innovation, which is why we positively encourage applications from suitably qualified candidates regardless of their gender identity, ethnicity, sexual orientation, religion, ability, intersex status or age. To support our commitment to diversity and inclusion, we celebrate special events and days of significance that are important to our employees such as Diwali, Bastille Day, Pride, IDAHOBIT, IWD and International day of people with Disabilities. Our Employee Resource Groups Women Capgemini and OutFront support the grassroots passion of employees to drive our diversity agenda and effect change.

Digital inclusion - at Capgemini we are using our skills to drive social impact initiatives focusing on helping society address the impact of the digital and automation revolution. We also provide employees with opportunities to give back to the community through charity projects and volunteer days.

Environmental Sustainability - Capgemini joined the CDP's (Carbon Disclosure Project) prestigious 'A list' for its commitment to the Net-Zero economy. We are focusing on helping our clients transform towards more sustainable business models and committing to reduce our own carbon emissions (GHG) by 20% per employee by 2020.

Recognized by Ethisphere as one of the World's Most Ethical Companies for the last 8 years in a row, ethics and values are at the heart of Capgemini's corporate culture and business. Embedded in our DNA, our seven values - Honesty, Boldness, Trust, Team Spirit, Freedom, Fun and Modesty - have remained the same since company inception in 1967. To see how we bring these values to life, click here to listen to some of our employee’s stories.

Come join us, bring your whole self to work, create new possibilities for you, your customers and your community and help us to be Architects of Positive Futures.