Backend Engineer (AI Native)

LinuxRecruit; Greater London; On-site; GBP 65,000 - 90,000; Full time

Job summary

LinuxRecruit is seeking a Backend Engineer to design and scale the infrastructure powering an AI-native platform for enterprise clients. Join a skilled team and take ownership of building scalable systems that handle large-scale AI workloads and complex data flows.

You will influence architecture and contribute across APIs, infrastructure, and data pipelines, while delivering reliable systems in a fast-moving environment.

Qualifications

• 3+ years of backend engineering experience.
• Strong system design skills for production-grade systems.
• Experience with distributed systems and PostgreSQL.
• Exposure to LLM infrastructure or AI-native applications.

Responsibilities

• Build scalable backend infrastructure to support enterprise-scale workloads.
• Create abstractions and tooling to speed up product development.
• Tackle high-volume LLM workloads, token throughput and real-time processing.
• Develop resilient distributed systems and optimise databases for scale.
• Own architecture decisions, performance, observability, authentication and job orchestration.
• Help shape engineering standards and improve developer experience.

Skills

Backend engineering

System design

Distributed systems

PostgreSQL

Queueing systems

LLM infrastructure

Ownership mindset

Tools

Temporal

Portkey

Job description

What if you could help build the AI technology that changes how the world's largest companies operate?

Some of the world's largest organisations are held back by the very software designed to support them. Complex legacy systems, fragmented infrastructure and slow moving processes make innovation harder than it should be.

This company is changing that.

They're building an AI native operating system for the enterprise, designed to remove IT complexity, modernise critical systems and fundamentally change how large organisations operate.

With a recently secured $60M Series A, backing from leading investors and major global enterprises already trusting their technology, they're making a serious impact in one of the most exciting areas of AI. And they're only getting started.

They're now looking for an exceptional Backend Engineer to help build and scale the foundational infrastructure powering their platform. Joining a small, highly talented engineering team, you'll have genuine ownership, tackle complex technical challenges and help shape technology being adopted by some of the world's largest businesses.

The challenge ahead:

This isn't a role where you'll simply maintain existing systems or work through a backlog of tickets. You will be building the infrastructure that allows an AI native platform to scale, supporting product teams as they develop and deliver increasingly sophisticated solutions for enterprise customers.

The technical challenges are substantial. The platform processes tens of millions of lines of code per customer, generating large scale LLM workloads while meeting the reliability, security and performance requirements of global enterprises. In this role, you will have the freedom to influence architecture, make important technical decisions and build systems that can scale alongside the business.

Your impact:

• Building scalable infrastructure: Designing and developing backend systems capable of supporting enterprise scale workloads.
• Enabling engineering teams: Creating shared abstractions, internal tooling and infrastructure that allow product engineers to build and ship faster.
• Solving complex AI challenges: Working with high volume LLM workloads, token throughput, real time processing and external provider reliability.
• Engineering for scale: Developing resilient distributed systems, optimising databases and managing large scale processing.
• Owning technical decisions: Taking responsibility for architecture, performance, observability, authentication and job orchestration.
• Driving engineering standards: Helping shape best practices, improve developer experience and build reliable systems from the outset.

Is this you?

They're interested in engineers who enjoy solving difficult problems, take ownership of their work and thrive in fast moving environments.

You’ll ideally bring:

• 3+ years of backend engineering experience, ideally with exposure to platform engineering or infrastructure.
• Strong system design skills and experience building production grade systems.
• Experience working with distributed systems, PostgreSQL, queueing systems and large scale batch processing.
• An understanding of performance optimisation, benchmarking and scaling systems under demand.
• Exposure to LLM infrastructure or AI native applications.
• The ability to take ownership of problems across APIs, infrastructure and data flows.
• A pragmatic engineering mindset, with the confidence to make decisions and challenge existing approaches.

You don't need experience with every technology in their stack. They're far more interested in strong engineering fundamentals, problem-solving ability and people who can quickly learn new technologies.

The Tech Stack:

• Backend: Kotlin, supported by the wider Java ecosystem.
• Frontend: React, Vite and TanStack.
• Infrastructure and orchestration: Temporal.
• LLM routing: Portkey.
• AI infrastructure: A specialised LLM harness designed to balance agent autonomy with enterprise grade governance, control and reliability.

Why Join?

This is an opportunity to join a well funded AI company at a genuinely exciting stage of growth. With $60M in Series A funding, established enterprise customers and significant technical challenges ahead, you'll be joining a business with the ambition and resources to make a lasting impact.

You'll work alongside highly capable engineers in a collaborative, low ego environment where ownership is encouraged, decisions are made quickly and your contributions directly influence the direction of the platform.

Interested?

If you're a backend engineer who wants to work at the forefront of AI, solve complex infrastructure challenges and help build technology that could fundamentally change how global enterprises operate, this is an opportunity worth exploring.