Senior Software Engineer

SNC-Lavalin; Cardiff; On-site; GBP 55,000 - 75,000; Full time

Job summary

A leading engineering consultancy in Cardiff is looking for a Senior Software Engineer to take ownership of projects and lead teams in delivering digital solutions. The role involves defining architecture, driving integration, and coaching engineers. Ideal candidates will have strong programming skills, experience in cloud platforms, and a robust understanding of Agile methodologies. This position offers competitive benefits and opportunities for professional development in a collaborative environment.

Benefits

Competitive salary

Flexible working arrangements

Training and professional development opportunities

Qualifications

• Significant professional experience in engineering sector with technical delivery.
• Strong programming skills and proficiency in web application development.
• Advanced competence in SQL and cloud platform integrations.
• Practical knowledge of Agile, DevOps, and CI/CD.
• Excellent communication and presentation skills.

Responsibilities

• Lead technical delivery and coordinate interfaces across disciplines.
• Define secure, scalable architectures for projects.
• Drive integration strategies to improve decision-making.
• Coach and mentor engineers to enhance delivery quality.
• Present technical solutions clearly to clients.

Skills

C#

Python

JavaScript

HTML/CSS

Agile methodologies

DevOps practices

SQL/database architecture

API integration

Communication skills

Education

Chartered or Incorporated status

Tools

Microsoft Power Platform

Azure

Angular

React

Blazor

Job description

Overview

AtkinsRéalis’ UK Transportation business brings together the expertise of our Highways, Rail, and Local Transport teams into a single, collaborative network of over 3,000 talented engineers, planners, and consultants.

With our unique breadth of services and global scale, we are recognised as one of the leading transportation infrastructure consultancies in the UK and internationally. We are passionate about shaping the future of mobility - combining engineering excellence with digital innovation to deliver sustainable, cutting-edge solutions for our clients. Our culture fosters creativity, collaboration, and continuous learning, empowering our people to make a real impact on the world around us.

You will be part of our Technology Solutions team within the Engineering Digital Practice, embedded in projects and collaborating with digital teams across the UK and internationally.

Role

As a Senior Software Engineer, you will take technical ownership of projects and lead teams to deliver advanced digital solutions for engineering and transportation projects. You’ll define architecture, drive integration of software and data platforms, embed “safe by design” principles, and coach engineers to raise delivery quality.

Your responsibilities will include:

• Leading technical delivery and coordinating interfaces across multiple disciplines.
• Defining secure, scalable architectures and setting assurance approaches for projects.
• Driving integration strategies that improve automation, reporting, and decision‑making.
• Championing Agile and DevOps practices; fostering continuous improvement and delivery quality.
• Coaching and mentoring engineers; contributing technical narratives and pricing input to bids.
• Presenting complex technical solutions to clients and stakeholders with clarity and confidence.

This role offers the opportunity to influence technical strategy and collaborate across the UK and internationally to deliver integrated, future‑ready solutions.

About you

We are seeking a professional Senior Software Engineer who combines advanced technical expertise with leadership capability. The ideal candidate will:

• Take ownership of technical outcomes and lead teams within their discipline.
• Communicate complex concepts clearly to clients and stakeholders, building trusted relationships.
• Instil good engineering practices, including security, quality, and “safe by design” principles.
• Show resilience, adaptability, and a proactive approach to problem-solving and continuous improvement.
• Mentor engineers and contribute to technical strategy and innovation.

Essential skills

These are the skills and experiences that will help you excel in this role. Some candidates may have all of them, others may have many but not all - and that’s okay! If you’re passionate about the role and bring relevant strengths, we’d love to hear from you.

• Significant professional experience, ideally within the engineering sector, with a track record of leading technical delivery on complex projects.
• Strong programming capability (e.g., C#, Python, JavaScript/HTML/CSS) and proficiency in modern web application development (e.g., Angular, React, or Blazor).
• Advanced competence in SQL/database architecture and integration with cloud platforms (Azure preferred).
• Practical knowledge of Agile, DevOps, and CI/CD with emphasis on engineering quality and traceability.
• Ability to automate workflows and integrate applications through APIs (e.g., Python, PowerShell).
• Proficient at designing secure, scalable architectures, technical assurance, and system integration.
• Experience leveraging Microsoft Power Platform (e.g., Power BI, PowerApp, Power Automate) to accelerate reporting and automation.
• Experience reviewing and assuring technical deliverables against standards and compliance.
• Excellent communication and presentation skills for client and team leadership including mentoring engineers.

Desirable skills

Chartered or Incorporated status with a recognised institution (e.g., IET, ICE, BCS) or demonstrable equivalent professional standing would be advantageous. We also value certifications in cloud technologies (e.g. Azure), Agile, or Scrum. Experience managing technical interfaces across multiple disciplines, following governance processes, and delivering technical training is desirable. Knowledge of transportation or engineering-related applications and experience developing plugins / working with APIs for geometry-based solutions within CAD software would be an asset.

Rewards & benefits

Explore the rewards and benefits that help you thrive – at every stage of your life and your career. Enjoy competitive salaries, employee rewards and a brilliant range of benefits you can tailor to suit your own health, wellbeing, financial and lifestyle choices. Make the most of a myriad of opportunities for training and professional development to grow your skills and expertise. And combine our hybrid working culture and flexible holiday allowances to balance a great job and fulfilling personal life.

Be rewarded. Find out more.

About AtkinsRéalis

Were, AtkinsRéalis, a world-class engineering services and nuclear organization. We connect people, data and technology to transform the worlds infrastructure and energy systems. Together, with our industry partners and clients, and our global team of consultants, designers, engineers and project managers, we can change the world. Were committed to leading our clients across our various end markets to engineer a better future for our planet and its people.

Find out more.

Additional information

Security clearance

This role may require security clearance and offers of employment will be dependent on obtaining the relevant level of clearance. If this is necessary, it will be discussed with you at interview. The vetting process is delivered by United Kingdom Security Vetting (UKSV) and may require candidates to provide proof of residency in the UK of 5 years or longer. If applying to this role please do not make reference to (in conversation) or include in your application or CV, details of any current or previously held security clearance.

We are committed to creating a culture where everyone feels that they belong - a place where we can all be ourselves, thrive and develop to be the best we can be. So, we offer a range of family friendly, inclusive employment policies, flexible working arrangements and employee resource groups to support all employees. As an Equal Opportunities Employer, we value applications from all backgrounds, cultures and ability.

#LI-UK#LI-ATKINS #LI-Transportation

Worker Type Employee Job Type Regular

At AtkinsRéalis , we seek to hire individuals with diverse characteristics, backgrounds and perspectives. We strongly believe that world-class talent makes no distinctions based on gender, ethnic or national origin, sexual identity and orientation, age, religion or disability, but enriches itself through these differences.