Senior Engineer - Agentic AI

MRJ Recruitment; Leeds; Hybrid; GBP 70,000 - 110,000; Full time

Job summary

One of the most exciting AI Product consultancies to hit the market in the last 12 months is seeking a Senior Backend Engineer in Leeds. The role blends hands-on development with technical leadership, shaping backend architecture and delivering production-grade systems for diverse enterprise clients.

You will work across the Microsoft stack—.NET/C#, Azure, APIs and databases—driving scalability, performance and reliability while mentoring peers and guiding project delivery.

Job description

Location: Leeds (at least 1 day per week)

Company: One of the most exciting AI Product consultancies to hit the market in the last 12 months

They are growing fast, winning serious enterprise work, and building an in-house AI capability that moves quicker than the competition. With a raft of new projects ready to go in, they are looking for a Senior Engineer to join their team.

We’re looking for innovators, the kind of engineer who doesn’t just read about new tools, but builds with them at home.

What you’ll be working on

• Leading the backend development of products for a diverse client base, from early-stage HealthTech startups to globally recognised automotive brands
• Building and evolving production-grade backend systems, APIs, services and integrations that are reliable, scalable and built to last
• Owning the technical direction of the backend, making pragmatic decisions around architecture, infrastructure, integrations, performance and maintainability
• Working across the Microsoft technology stack, with strong hands-on development across .NET / C#, Azure, APIs, databases, cloud services and distributed systems
• Taking ownership from technical discovery through to delivery, working closely with product, frontend, data and client teams to turn requirements into robust technical solutions
• Leading and mentoring other developers, setting engineering standards, reviewing code and helping the wider team solve complex technical problems
• Working across multiple projects and technologies, adapting quickly to different client environments and choosing the right approach rather than forcing everything into one pattern
• Supporting the continued growth of our backend capability, with new projects and client requirements coming through that will need someone who can provide both technical leadership and hands‑on development

Who we’re looking for

We're looking for a Lead Developer who is still very hands‑on. Someone who can take ownership of a backend problem, work out the right architecture, get stuck into the code and then help the wider team deliver it properly.

You don't need to know every technology we use, but you should be someone who is comfortable working across the Microsoft ecosystem, particularly .NET, C#, Azure and backend/API development, and who enjoys figuring things out when the answer isn't immediately obvious.

We're particularly interested in someone who enjoys the "How should we build this?" questions — someone who can challenge an approach, make sensible architectural decisions and then roll up their sleeves and build it.