At a Glance
- Tasks: Join a team transforming billing systems with modern tech and AI.
- Company: Globally connected business at the heart of international trade.
- Benefits: £60-65k salary, 10% bonus, 8% pension, private medical, and hybrid work.
- Other info: Opportunity for career growth in a dynamic, collaborative environment.
- Why this job: Make a real-world impact while working on complex billing systems.
- Qualifications: Strong .NET development experience with billing or financial systems required.
2 Year Fixed Term Contract in Southampton, 3 days per week. Salary: £60-65k + 10% Bonus, 8% Pension, Private Medical.
This role cannot offer Visa Sponsorship. You must have Billing Systems or Financial Product Experience to apply.
Your new company: I'm recruiting exclusively for a globally connected business operating at the heart of international trade. Their name is known worldwide with over 100k employees following recent acquisitions. You will join initially on a 2-year Fixed Term Contract. With a significant multi-year Billing Transformation Programme underway, the business is replacing a complex legacy billing platform with a modern enterprise solution. This is a high-impact programme with strong investment to modernise and the chance to introduce AI in production. It offers the security of a multi-national with the strong collaboration and interaction of an SME. This role is hybrid, with a minimum of 3 days in their Southampton office.
Your new role: This is not a typical greenfield development role. You will sit at the heart of a complex billing environment, working across system stabilisation, reverse engineering and transformation support. The role is best suited to someone who enjoys understanding how systems truly work, not just building new features. A large part of your time will involve working on a heavily customised, customer-specific billing platform, where logic can vary significantly between clients. You will analyse existing code, uncover undocumented behaviours and translate this into clear documentation and understanding for both technical and business teams. You will work closely with Billing SMEs, Business Analysts and programme stakeholders, acting as the bridge between technical implementation and real-world billing processes. Alongside this, you will support ongoing changes and enhancements, ensuring anything delivered today aligns with the longer-term transition to a new enterprise billing system. There is also a strong focus on modern engineering practices, including the use of AI-assisted tooling to improve understanding, documentation and delivery across a complex environment.
What you will need to succeed: You will be a strong .NET Developer with experience working on complex or business-critical systems within billing/invoicing or on transactional financial products where the system is tailored to different customers' needs. The key requirement is the ability to take ownership of an existing system. This means being comfortable reading and understanding legacy code, troubleshooting issues and explaining behaviour to non-technical stakeholders. You will have solid experience across C# / .NET and SQL Server and APIs, alongside an understanding of how systems integrate and handle complex data. Exposure to containerisation (Docker) and modern DevOps practices will also be important. Experience working in reverse engineering of existing applications, transformation programmes, modernisation initiatives or environments with limited documentation would be highly beneficial, as would experience working with AI-assisted Engineering tools like Claude or CoPilot in production.
What you will get in return: You will be joining a business where the systems you build have real-world impact at scale. This is an opportunity to influence both the technical direction and the culture of a team, within an organisation that is actively investing in its technology capability. You will benefit from a hybrid working model, a guaranteed 10% bonus, 8% pension match, private healthcare, life assurance and 25 days holiday plus bank holidays.
What you need to do now: At Hays Technology, we are shaping the future of recruitment. The rapid adoption of cloud, which is making customer interfaces more engaging and creating a seamless engagement with businesses, means that from the foundation of your organisation up, software developers are critical to success. As the competition for talent grows, we are ready and waiting to help developers really make an impact on organisations, so talk to us today. We are Hays Technology.
To find out more and to be considered for this position please apply directly, or contact Max Wilcock, Senior Business Director.
Senior .Net Developer (Billing Systems Essential) in Southampton employer: Hays Technology
Join a dynamic technology team as an Application Engineer/Web Developer, where innovation meets collaboration in a fast-paced environment. Enjoy flexible working arrangements and an industry-leading benefits package, including a generous bonus and pension scheme, while contributing to the development of high-quality digital platforms. With ample opportunities for professional growth and a culture that promotes knowledge sharing and best practices, this role is perfect for those looking to make a meaningful impact in the tech industry.
StudySmarter Expert Advice🤫
We think this is how you could land Senior .Net Developer (Billing Systems Essential) in Southampton
✨Get Involved in Open-Source Projects
Diving into open-source projects is a brilliant way to showcase your skills and connect with other developers in the community. Not only will you beef up your GitHub profile but you might also catch the eye of someone at Hays Technology who values hands-on experience over just theory.
✨Attend Local Tech Meetups
Tech meetups are gold mines for networking and discovering job opportunities, especially in the fast-paced world of software engineering. Check out local listings for events in your area and don’t shy away from introducing yourself. This could lead directly to a temporary position at Hays Technology!
✨Showcase Your Work Online
With temporary roles, it’s all about standing out in a short space of time. Create a portfolio website where you highlight your projects and skills. Talk about your code, and provide links to your GitHub repositories. This will not only demonstrate your abilities but will also make it easier for recruiters at Hays Technology to see what you bring to the table.
✨Leverage Temporary Job Boards
Don’t forget to check specialised job boards for temporary software development roles. Websites like We Work Remotely or Remote OK often list short-term gigs that can be a perfect fit. Apply directly through our website as well, making sure your application is sharp—temporary roles can move fast!
We think you need these skills to ace Senior .Net Developer (Billing Systems Essential) in Southampton
Some tips for your application 🫡
Show Off Your Tech Skills:Make sure your CV highlights your tech stack and any programming languages you’re proficient in. Include specifics about any frameworks or technologies you’ve worked with; they can make you stand out in the sea of applicants. It’s all about showing that you have the chops we need at Hays Technology!
Portfolio 2.0:Since you’re applying for a temporary gig, it’s super important to showcase a portfolio that highlights your best projects. Include links to GitHub or any personal projects that demonstrate what you can do in a real-world environment. This gives us a taste of your style and your problem-solving approach!
Keep It Brief and Relevant:With a temporary position, we want to see your ability to hit the ground running. Be concise in your CV and cover letter; stick to experiences that directly relate to the role. Highlight any previous temporary roles or freelance gigs that show your adaptability and quick learning!
Tailor Your Cover Letter:Don’t just send a generic cover letter. Personalise it for Senior .Net Developer (Billing Systems Essential) at Hays Technology! Mention why this temporary role excites you and how you see yourself contributing in the short run. Show us what you've got and why you're the one for this quick turn-around!
How to prepare for a job interview at Hays Technology
✨Nail the Technical Skills
For a software engineering role, you'll likely face technical questions or coding tasks during your interview. Brush up on the relevant programming languages and frameworks that Hays Technology uses, and don’t forget to practice some coding challenges on platforms like LeetCode or HackerRank. Showing your coding prowess can really make you stand out!
✨Prepare for System Design Questions
Even for a temporary role, having a grasp of system design principles can be crucial. Be ready to discuss how you would architect a software solution, including discussing trade-offs, scalability, and performance considerations. Having examples from previous projects can really show off your analytical thinking.
✨Demonstrate Your Adaptability
Since this is a temporary role, you'll want to emphasise your ability to hit the ground running. Highlight experiences where you quickly adapted to new technologies or teams. Let’s make it clear to the interviewers at Hays Technology that you can learn on the job and deliver results in a short timeframe!
✨Show Off Your Portfolio
Make sure to have a portfolio or GitHub ready showcasing your projects. Having tangible evidence of what you've done—be it personal projects, contributions to open-source, or previous work—can convey how capable you are. Tailor this for what might interest Hays Technology, so it's relevant and sparks conversation during your interview.
