At a Glance
- Tasks: Design and build secure software products that enhance performance and decision-making.
- Company: Join a leading nuclear engineering firm with a global presence.
- Benefits: Enjoy hybrid working, flexible hours, and a competitive benefits package.
- Other info: Be part of a diverse team driving digital transformation in engineering.
- Why this job: Make a real impact on critical infrastructure projects while advancing your career.
- Qualifications: Experience in software development, API design, and collaborative teamwork.
The predicted salary is between 55000 - 65000 £ per year.
Today, Assystem is among the top three independent nuclear engineering firms worldwide. With over 60 years of experience in highly regulated sectors, the group supports public and industrial stakeholders in the execution of complex and strategic infrastructure projects, subject to high safety and security requirements. Assystem mobilizes 8,000 experts in 13 countries and intervenes across the entire project lifecycle, in engineering, project management and digital solutions. In line with our 2030 Business Plan, we are delivering a major enterprise transformation initiative—the Assystem Transformation Programme (ATP)—to streamline and harmonise business operations across all geographies.
The Job Mission
We are looking for a Senior Software Engineer to join the Digital Excellence Centre (DEC) UK. You will help design, build and support secure, maintainable software products and reusable components that improve performance, decision‑making and delivery across the business and for our clients. This is a hands‑on role in a small, senior team, with real scope to influence technical direction, engineering standards and solution design. You will work across a varied technology environment, contribute from discovery through to production support, and collaborate closely with colleagues in the UK, India and, where relevant, France.
What you will do
- Work closely with senior stakeholders to understand requirements
- Design, build, test, deploy and support software applications, services and reusable components
- Produce pragmatic technical designs that balance quality, security and maintainability
- Work across back‑end services, integrations and user‑facing applications
- Contribute to engineering standards through code review, testing, CI/CD and documentation
- Design secure APIs and integrations across digital products, enterprise systems and data services
- Work closely with data engineers on APIs, events and data contracts
- Support and mentor others through pairing, review and day‑to‑day collaboration
- Help make sensible technology choices that keep solutions supportable over time
Qualifications
- Practical use of, or strong interest in use of AI‑assisted development tools in a responsible delivery environment
- Experience delivering production software end to end, working closely with stakeholders
- Experience designing APIs and integrating with enterprise systems and data services
- Good understanding of software design principles and modern engineering practice
- Experience with automated testing and CI/CD
- Experience working with relational databases
- Familiarity with database and caching technologies
- Understanding of secure coding and modern authentication and authorisation
- Experience delivering software in cloud‑hosted environments, e.g., Azure
- Ability to work effectively across a mixed technology estate
- Strong communication skills and experience working in collaborative teams
- Experience mentoring others through review, pairing and practical support
- Experience with container tooling
- Familiarity with Microsoft tooling, including Power Platform
- Experience with Office document automation, including Excel, Word and PDF generation
Security and eligibility
Depending on project requirements, you may need to meet UK residency criteria and achieve UK security clearance, such as BPSS and potentially SC.
Additional Information
You do not need deep expertise in all of these, but you should be comfortable learning and contributing across a varied environment. Our current stack includes, but is not limited to: C#/.NET, SPython/FastAPI/Django, TypeScript, Angular, Vue.js, PostgreSQL, MongoDB, Redis/Valkey, RabbitMQ, Kafka, Azure, S3‑compatible storage, Talend, NiFi, Docker, Podman, Kubernetes, Power Platform and Office document automation tools such as Aspose.
Join Assystem and play a key role in delivering enterprise‑wide digital transformation across a global engineering organisation. Work alongside highly experienced software and data professionals to build innovative solutions supporting critical infrastructure projects while developing your career in a collaborative and forward‑thinking environment.
Benefits
- Hybrid Working Opportunity
- Flexible working hours
- Pension scheme (8% company contribution / 4% personal contribution)
- 25 days’ paid annual leave + bank holidays + option to buy or sell days
- Professional fees reimbursed
- Employee referral scheme
- Competitive Sick Pay – Support when you need it
- Income Protection & 3x Salary Death‑in‑Service Cover
- Free Digital Gym Access – Expert‑led fitness classes
- 24/7 Employee Support Line – Mental health, financial & legal help
We are committed to equal treatment of candidates and promote, as well as foster all forms of diversity within our company. We believe that bringing together people with different backgrounds and perspectives is essential for creating innovative and impactful solutions. Skills, talent, and our people’s ability to dare are the only things that matter.
NOTICE TO CANDIDATES ON RECRUITMENT FRAUD – We are committed to safeguarding candidates from fraudulent activity associated with our recruitment process. Please note that we will never offer specialist CV writing services, request payment or ask for sensitive personal information during the recruitment process.
Senior Software Engineer — Hybrid, Build Secure APIs & Apps in Bristol employer: Assystem
Assystem is an exceptional employer, offering a dynamic and collaborative work environment where innovation thrives. With a strong commitment to employee growth, the company provides extensive benefits including hybrid working options, flexible hours, and professional development opportunities, all while contributing to critical infrastructure projects that make a real difference. Join a team of experienced professionals dedicated to delivering digital transformation in a supportive culture that values diversity and fosters creativity.
StudySmarter Expert Advice🤫
We think this is how you could land Senior Software Engineer — Hybrid, Build Secure APIs & Apps in Bristol
✨Tip Number 1
Network like a pro! Reach out to your connections in the industry, attend meetups, and engage with professionals on platforms like LinkedIn. You never know who might have the inside scoop on job openings or can refer you directly.
✨Tip Number 2
Prepare for those interviews! Research the company, understand their projects, and be ready to discuss how your skills align with their needs. Practise common interview questions and have examples ready that showcase your problem-solving abilities.
✨Tip Number 3
Show off your work! Create a portfolio or GitHub repository showcasing your projects, especially those involving secure APIs and applications. This gives potential employers a tangible sense of your skills and experience.
✨Tip Number 4
Don’t forget to apply through our website! It’s the best way to ensure your application gets seen by the right people. Plus, it shows you’re genuinely interested in joining our team at Assystem.
We think you need these skills to ace Senior Software Engineer — Hybrid, Build Secure APIs & Apps in Bristol
Some tips for your application 🫡
Tailor Your CV:Make sure your CV reflects the skills and experiences that align with the Senior Software Engineer role. Highlight your experience with secure APIs, cloud environments, and any relevant technologies from our stack.
Craft a Compelling Cover Letter:Use your cover letter to tell us why you're passionate about software engineering and how you can contribute to our Digital Excellence Centre. Share specific examples of past projects that demonstrate your problem-solving skills and adaptability.
Showcase Your Technical Skills:In your application, don't just list your technical skills—show us how you've applied them in real-world scenarios. Discuss your experience with CI/CD, automated testing, and any mentoring you've done to support others in their development.
Apply Through Our Website:We encourage you to apply directly through our website for a smoother process. This way, we can ensure your application gets the attention it deserves and you can easily track its progress.
How to prepare for a job interview at Assystem
✨Know Your Tech Stack
Familiarise yourself with the technologies mentioned in the job description, like C#/.NET, Python, and Azure. Even if you don't know every tool, having a solid understanding of the key technologies will show your adaptability and willingness to learn.
✨Showcase Your Problem-Solving Skills
Prepare examples of how you've tackled complex problems in previous roles. Be ready to discuss your thought process and the practical approaches you've taken to deliver secure and maintainable software solutions.
✨Engage with Stakeholders
Demonstrate your ability to work closely with senior stakeholders by discussing past experiences where you gathered requirements or collaborated on projects. This will highlight your communication skills and your understanding of the importance of stakeholder engagement.
✨Emphasise Mentorship and Collaboration
Since the role involves supporting and mentoring others, be prepared to share instances where you've helped colleagues grow. Discuss your approach to collaboration and how you contribute to team success, as this aligns with the company's values.
