Senior Software Engineer

Cox Automotive UK Limited; Loures; Hybrid; EUR 70,000 - 95,000; Full time

Job summary

Cox Automotive Europe in Lisbon is seeking a Senior Software Engineer to design, build, and maintain scalable backend solutions using .NET, AWS, and event-driven architectures. You will collaborate with Tech Leads, Product Managers, and Architects to shape the software across our vehicle marketplaces and data platforms.

You will mentor teammates, contribute to engineering standards, and promote best practices while leveraging AI-assisted tools to accelerate delivery.

Qualifications

• Hands-on software engineering with .NET technologies.
• Experience building cloud-native apps on AWS.
• Strong knowledge of microservices and event-driven architecture.
• Experience with Infrastructure as Code, especially Terraform.
• SQL and NoSQL databases.
• Experience in Agile teams and CD environments.
• Practice of clean code and software engineering best practices.
• TDD/BDD experience.
• Experience with AI-assisted development tools.

Responsibilities

• Design, build, and maintain scalable, secure software.
• Write clean, maintainable code using modern practices.
• Collaborate with product, architecture, QA, and UX teams.
• Contribute to design discussions and continuous improvement.
• Automate tests and ensure quality through unit/integration tests.
• Identify and resolve performance, scalability, security challenges.
• Participate in CI/CD and trunk-based development.
• Support production services with monitoring.
• Conduct code reviews and mentor engineers.
• Mentor less experienced team members.
• Leverage AI-assisted development to accelerate delivery.
• Promote collaboration and continuous learning.

Skills

.NET

AWS

Microservices

Event-driven architecture

SQL/NoSQL

Agile

TDD/BDD

GitHub Copilot

CI/CD

English proficiency

Education

Tools

Terraform

Docker

Kubernetes

xUnit

Playwright

GraphQL

React

GitHub Actions

Job description

Shape the Future of Automotive Technology

At Cox Automotive Europe, we're transforming the way the automotive industry connects, trades, and grows. Through significant investment in technology, data, and AI, we're building the next generation of digital products that power vehicle marketplaces, data platforms, CRM solutions, and customer experiences across Europe.

The Opportunity

As a Senior Software Engineer, you'll play a key role in designing, building, and maintaining scalable software solutions that power our business. Working closely with Tech Leads, Product Managers, Architects, QA Engineers, and fellow developers, you'll contribute to every stage of the software development lifecycle.

You'll primarily focus on backend engineering using .NET, AWS, and event-driven architectures, while collaborating across the wider technology stack when needed. This role offers the opportunity to influence technical direction, contribute to engineering standards, mentor colleagues, and help establish best practices within our growing Lisbon Technology Hub.

What You'll Be Doing

• Design, build, and maintain scalable, secure, and high-performing software solutions.
• Develop clean, maintainable, and efficient code using modern engineering practices.
• Collaborate closely with Product, Architecture, QA, and UX teams to deliver customer-focused solutions.
• Contribute to solution design, technical discussions, and continuous improvement initiatives.
• Build quality into every release through automated unit, integration, and end-to-end testing.
• Identify and resolve performance, scalability, reliability, and security challenges.
• Participate in CI/CD and trunk-based development practices to ensure rapid and reliable delivery.
• Support production services using monitoring and observability tools.
• Conduct code reviews and provide technical guidance to fellow engineers.
• Mentor and support less experienced members of the team.
• Leverage AI-assisted development tools and practices to accelerate delivery while maintaining high engineering standards.
• Promote a culture of collaboration, innovation, and continuous learning.

What We're Looking For

Essential Experience & Skills

• Strong hands-on software engineering experience using .NET technologies.
• Experience building cloud-native applications using AWS services.
• Solid understanding of microservices and event-driven architecture.
• Experience working with Infrastructure as Code, particularly Terraform.
• Knowledge of SQL and NoSQL database technologies.
• Experience working within Agile product teams and Continuous Delivery environments.
• Strong understanding of software engineering best practices and clean code principles.
• Experience with Test-Driven Development (TDD) and/or Behaviour-Driven Development (BDD).
• Experience using AI-assisted development tools such as GitHub Copilot, Claude Code, or similar.
• Strong problem-solving skills and the ability to deliver pragmatic technical solutions.
• Excellent communication and collaboration skills.
• Professional proficiency in English.

Nice to Have

• Experience with spec-driven development and AI-enabled engineering practices.
• Front-end development experience with React, Next.js, GraphQL, and micro-frontend architectures.
• Experience with Docker, Kafka, and distributed systems.
• Familiarity with xUnit, Playwright, Jest, and React Testing Library.
• Experience using observability platforms such as New Relic.
• Exposure to cloud migration, modernisation, or legacy transformation programmes.
• Knowledge of Salesforce platforms and integrations.

You'll work with a modern technology ecosystem including:

• Frontend: React, Next.js, GraphQL
• DevOps & Quality: GitHub Actions, CI/CD, xUnit, Playwright

While experience across our entire stack isn't required, we're looking for engineers who are passionate about learning and working with modern technologies.

Why Join Us?

Joining Cox Automotive Europe means becoming part of a business that is investing heavily in technology, innovation, and people.

You'll have the opportunity to:

• Work on products that impact customers across Europe.
• Build modern cloud-native applications using industry-leading technologies.
• Collaborate with talented engineers, architects, and product teams.
• Shape engineering standards and ways of working within a growing technology hub.
• Gain hands-on experience with AI-enabled software development practices.
• Develop your career within an international technology organisation.
• Contribute to large-scale transformation programmes that are reshaping the automotive industry.

Our Culture

At Cox Automotive Europe, we believe great technology is built by empowered teams.

We're looking for individuals who are:

• Customer-focused and outcome-driven.
• Collaborative, inclusive, and supportive.
• Curious, adaptable, and committed to continuous learning.
• Strong communicators who build trust and influence across teams.
• Motivated to help others grow and succeed.

We value diverse perspectives and believe that inclusive teams create stronger solutions, better ideas, and better outcomes for our customers.

Diversity, Equity & Inclusion

We're committed to creating a workplace where everyone feels respected, valued, and empowered to bring their authentic selves to work. We welcome applications from all qualified individuals regardless of background, identity, or experience.

Ready to Join Us?

If you're passionate about building high-quality software, working with modern technologies, and helping shape the future of automotive technology, we'd love to hear from you.

Recruitment Agencies

We are managing this recruitment directly and are not seeking agency support for this opportunity.

We kindly ask that recruitment agencies refrain from submitting unsolicited CVs or candidate profiles. Any candidate information submitted without a signed supplier agreement and formal engagement from Cox Automotive Europe will not be eligible for placement fees and may be treated as a direct application. Thank you for respecting our recruitment process.