Backend Engineer in London

Lightning AI is the company behind PyTorch Lightning. Founded in 2019, we build an end‑to‑end platform for developing, training, and deploying AI systems—designed to take ideas from research to production with less friction. We serve solo researchers, startups, and large enterprises.

We’re looking for a Backend Engineer to help develop and scale the Lightning AI platform, spanning APIs, infrastructure, billing, security, and integrations. In this role, you’ll take ownership of key features and drive them end‑to‑end, working closely with engineering, product, and design to ship high‑quality, iterative improvements. This is an opportunity to build systems that support real‑world machine‑learning workloads at scale.

What You’ll Do:

• Write readable/testable/efficient code in Go (Golang).
• Build deep expertise in our technology stack to deliver new features, improve system stability, and increase overall performance.
• Partner with engineering and product leaders on developing the Lightning product while using your experience to set the technical direction for large projects.
• Evaluate, strengthen, and document technical architecture, tools, and processes.
• Maintain software quality, implement automation, drive continuous delivery, and reduce time to production while proactively reducing technical debt.
• Mentor and coach engineers on system design, operating in high uncertainty, and problem‑solving to create a supportive, inclusive environment where each engineer can grow.

What You’ll Need:

• Extensive experience writing efficient, maintainable code in Go.
• Familiarity with best practices in testing, readability, and optimization is essential.
• Broad knowledge of backend and frontend systems, with experience building and scaling APIs, CLI tools, billing systems, and security protocols.
• Exposure to frontend frameworks is a plus.
• Experience with cloud platforms like AWS, GCP, or Azure and designing systems that are reliable, performant, and scalable.
• Familiarity with containerization (Docker, Kubernetes) is a strong advantage.
• Proven ability to take ownership of key features and drive end‑to‑end development.
• Commitment to software quality, test automation, and continuous delivery.
• Experience proactively managing technical debt and speeding up time to production.
• Hands‑on experience as a backend or product engineer in a SaaS technology company.
• Communication and collaboration with engineers, product managers, and designers.
• Ability to operate in high uncertainty and rapidly changing environments.

Compensation:

We are committed to offering competitive compensation that reflects the value each team member brings to our mission. Final offers are based on factors such as experience, skills, geographic location, and role expectations. In addition to base salary, our total rewards package for eligible roles includes a discretionary bonus, a meaningful equity component, and comprehensive benefits. The anticipated annual base salary range for this role is: $180,000 - $250,000 USD.

Benefits and Perks:

• Comprehensive medical, dental and vision coverage (U.S.); Private medical and dental insurance (U.K.)
• Retirement and financial wellness support (U.S.); Pension contribution (U.K.)
• Generous paid time off, plus holidays
• Paid parental leave
• Wellness and work‑from‑home stipends
• Flexible work environment

Equal Employment Opportunity Statement:

At Lightning AI, we are committed to fostering an inclusive and diverse workplace. We believe that diverse teams drive innovation and create better products. We provide equal employment opportunities to all employees and applicants without regard to race, color, religion, gender, sexual orientation, gender identity, national origin, age, disability, veteran status, or any other protected characteristic. We are dedicated to building a culture where everyone can thrive and contribute to their fullest potential.