.net software engineer jobs in Southampton

You will join a cross-functional product engineering team working on the evolution and modernisation of a core SaaS platform. The focus is on building scalable, cloud-native services while improving reliability, performance, and long-term maintainability.

Job Description Job Title: Software Development Engineer Salary: Up to £75k Job Type: Full Time, Permanent Location: Fareham, Hampshire (Hybrid working available) About the Opportunity: A UK-based technology organisation in Fareham is seeking a Software Development Engineer to support the development of software used within government, defence and law-enforcement environments. This role...

You will design and build APIs that enable products, partners and AI services to work together, including: Building RESTful APIs using C# .

You will likely bring: Strong experience building backend services in C# .

Job Title: Logistics Software Engineer Location: Havant – 1 day a week onsite Salary: Up to £60,000 Contract Type: Fixed Term – 12 Months Join Our Team as a Logistics Software Engineer and Drive Software Engineering to New Heights! Are you a meticulous Software Engineer with a passion for precision and excellence? Are you ready to play a pivotal role in ensuring top-tier standards in a...

You will be working closely with the Machine Learning team; however, you are not required or expected to have background in Machine Learning. This is an applied role, and we are looking to hire a software engineer with experience in cloud computing and distributed systems. In this role, you will:

Software Engineer Document Management & Workflow Systems (Contract) Any additional information you require for this job can be found in the below text Make sure to read thoroughly, then apply. Details - Initial 6-month contract with extension - Fully remote (EU time zones) - Start: End of February / early March - Outside IR35 We are looking for an experienced Software Engineer contractor to...

Senior Backend Developer (.NET | AI-First SaaS Platform) Compensation: Competitive, based on location and experience Location: UK or Turkey (Hybrid – Office & Remote) Keepnet is an AI-driven SaaS platform experiencing strong, sustained growth in the UK with growing global momentum, helping organisations manage human cyber risk at scale. With Agentic AI live in production, Keepnet runs...

About the Job This position is for a Senior Software Engineer with a minimum of 5 years of experience in backend development and a passion for building robust, scalable systems. We are looking for an engineer with a strong background in the C# .NET ecosystem, and a preference for candidates with significant experience on AWS. Are you ready for a challenge? We’re looking for a dynamic software...

Job Description Software Engineer (all seniorities) Location: Southampton Our client: We are using and creating technology to transform operations at sea to enable people and the planet to thrive. We are open-minded and fearless in our approach to innovation and don’t believe in boundaries. We challenge everything and have massive ambitions to drag ageing industries into the tech era. We...

Key Responsibilities - Design, implement, and maintain software for nuclear systems, ensuring compliance with safety and regulatory standards. - Develop software for reactor control, monitoring systems, data acquisition, simulation, and predictive analytics. - Collaborate with multidisciplinary teams including nuclear engineers, electrical engineers, and safety specialists. - Apply best...

SOFTWARE ENGINEER REMOTE (OPTION TO RELLOCATE) £110K + EQUITY THE COMPANY This innovative AI startup is redefining safety and reliability in AI models. While competitors like GPT and DeepMind struggle with hallucinations and illegal content generation, this company adds safety control layers to ensure AI outputs are trustworthy and compliant. Working with high-profile, they’re building AI...

You should be comfortable with most of our core technologies:

Job Description Job Title: SC Cleared Software Engineer Location: Farnborough, Malvern or Portsmouth Duration: 6 months with possible extension Rate: Up to £745.00 via an approved umbrella company Must be willing and eligible to go through the SC Clearance process Our client, a leading organisation supporting maritime test and evaluation facilities, is hiring for a talented Software Engineer to...

About the Role: Join our innovative engineering team and play a key role in developing advanced control systems for next-generation vehicles. This position offers the opportunity to work on complex software solutions that integrate control theory, real-world testing, and cutting-edge technology. If you thrive on solving technical challenges and collaborating in a dynamic environment, this role...

You will join a leading defence and national security consultancy, working on software for products in the RF communication and sensors domain.

You will be responsible for the detailed design, implementation and testing of components of the product software, working with an agile team.

Software Engineer – £65,000–£85,000 + Equity – Remote (UK) - London office if preferred The Opportunity 💻 Join a fast-growing, AI-native software company building workflow automation tools used daily by thousands of professionals across people-heavy industries. The platform removes manual, repetitive work through AI, automation and thoughtful product design, helping teams move faster and focus...

Senior/Lead Software Engineer – Fully Remote (UK) A global B2B SaaS technology business is building out its European engineering hub and is hiring multiple Senior / Lead Software Engineers (JavaScript) to develop and enhance a mission-critical platform used internationally. These are hands-on individual contributor role with strong ownership — ideal for engineers who enjoy building high-quality...

Software Engineer Are you a Software Engineer who loves tackling complex technical challenges, pushing boundaries, and building products that make a real impact? We are working with a marketing leading company in the development of subsea products and systems used across the Energy, Science, Offshore and Defence sectors. They are looking for a Software Engineer to join their high‑performing...

You will work on challenging, real-world technical problems, from early-stage research through to fully released products, contributing to solutions that operate in demanding and high-assurance environments.

You will be part of a small, highly capable engineering team responsible for designing and delivering secure, high-reliability solutions.

Due to progression, this role exists to replace a senior engineer within a well-established software company operating in the highly regulated energy sector. Senior Python Software Engineer Circa £56,000 + up to 15% bonus | Hybrid (2 days per month onsite, Southampton) The software you'll work on is business critical. It must be reliable, auditable, and able to stand up to regulatory scrutiny....