Staff Backend Engineer

JR United Kingdom; London; Hybrid; GBP 60,000 - 100,000; Full time

Job summary

An innovative AI-powered SaaS company is seeking a Staff Backend Engineer to scale their cutting-edge platform. This role involves designing robust architectures and optimizing backend systems for multi-tenant AI applications. Collaborate closely with founders and engineering leadership to drive AI adoption across Fortune 500 enterprises. Enjoy flexible hybrid working, generous holiday allowance, and equity options as you contribute to high-impact solutions in a dynamic startup environment. If you're passionate about backend development and thrive in collaborative settings, this opportunity is perfect for you.

Benefits

Top 15% equity options plan

30 days holiday + bank holidays

Company-wide retreats

Flexible hybrid working

Work from anywhere for 1 month per year

Qualifications

• 5+ years of backend development experience with strong architectural skills.
• Cloud infrastructure expertise with experience at scale.

Responsibilities

• Architect and scale backend systems for multi-tenant AI applications.
• Maintain and expand highly performant APIs for internal and B2B clients.

Skills

Backend Development

Architectural Skills

Functional Programming (Elixir, Scala, Go, Node.js, Haskell)

Cloud Infrastructure (AWS, Terraform)

Distributed Systems

Observability

GenAI and Prompt Engineering

Tools

AWS

Terraform

Docker

Job description

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Staff Backend Engineer | AI-Powered SaaS | London (Hybrid)

We’re partnered with a top-ranked AI SaaS company backed by leading AI pioneers and a $30M+ Series A. Their platform is transforming no-code AI workflows and powering Fortune 500 enterprises worldwide.

The Role

As a Staff Backend Engineer, you'll play a critical role in scaling an AI-first platform, enabling foundation models like Gemini Pro to analyze multimodal data at scale. You'll work closely with the founders and engineering leadership to design robust, high-performance architectures that drive AI adoption at enterprise levels.

Responsibilities

• Architect and scale backend systems for multi-tenant AI applications.
• Maintain and expand highly performant APIs for internal and B2B clients.
• Build and optimize infrastructure using AWS, Terraform, and Docker.
• Ensure observability and efficient queue management.
• Ship to production multiple times a day, solving real-world user challenges.

Your Experience

• 5+ years of backend development experience with strong architectural skills.
• Experience with functional programming (Elixir, Scala, Go, Node.js, Haskell, etc.).
• Cloud infrastructure expertise (AWS, Terraform) with experience at scale.
• Deep understanding of distributed systems, orchestration, and observability.
• Knowledge of GenAI and prompt engineering is a plus.
• Passion for early-stage startups, small-team collaboration, and a customer-centric mindset.
• Top 15% equity options plan
• 30 days holiday + bank holidays (plus 1 extra day per year of service)
• Company-wide retreats & flexible hybrid working
• Work from anywhere for 1 month per year

If you’re a backend specialist who thrives in high-impact product focused environments, apply today!