Senior Software Engineer (.NET)

Senior Software Engineer (.NET)

Financial Services Consultancy | Payments & Gateways
📍 Oxford area (Hybrid - 3 days in office)
💷 £70,000 base + discretionary bonus

I'm currently working with a well-established financial services technology consultancy based in the Oxford area. The business specialises in delivering complex, high-volume systems for banks, FinTech's, and payment providers, with projects heavily focused on payment integrations and gateway platforms.

They're looking to hire a Senior Software Engineer to join their engineering team, someone who can combine hands-on development with mentoring and technical leadership.

The Opportunity

This is a hybrid role, ideally requiring three days per week in the office, and offers exposure to a wide range of client projects rather than a single internal product.

You'll be working in regulated, transaction-heavy environments where quality, scalability, and security are critical.

You'll be responsible for:

• Designing and building solutions using .NET Framework
• Delivering projects centred around payment gateways, integrations, and transactional systems
• Developing front-end applications using modern JavaScript frameworks (Angular or React preferred)
• Deploying and maintaining applications in Microsoft Azure
• Working with containerised environments and Kubernetes
• Collaborating with senior engineers, architects, and client stakeholders
• Owning code quality, best practices, and technical decision-making
• Mentoring junior and mid-level engineers

What They're Looking For

• 5-10 years' commercial software engineering experience
• Strong expertise in .NET Framework (modern .NET/.NET Core exposure beneficial)
• Experience with Angular or React
• Proven hands-on experience with Azure
• Experience working with Kubernetes
• Background in financial services, ideally with payments exposure
• Experience with payment integrations, gateways, or high-volume transactional systems
• Demonstrated mentoring or technical leadership experience
• Comfortable working in a consultancy or client-facing environment

Nice to Have

• Experience with AWS
• Previous consultancy experience
• Strong API and integration skills
• Exposure to regulated or compliance-driven systems

What's On Offer

• £70,000 base salary
• Discretionary annual bonus
• Hybrid working model (3 days per week in the office)
• Technically challenging projects within financial services and payments
• Clear progression and opportunities for technical leadership

📩 Interested? Get in touch to discuss the role confidentially.

Oscar Associates (UK) Limited is acting as an Employment Agency in relation to this vacancy.

To understand more about what we do with your data please review our privacy policy in the privacy section of the Oscar website.