Engineer - back End Developer 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. Through our merger with Voltage Park, a neocloud and AI Factory, Lightning AI combines developer-first software with cost-efficient, large-scale compute. Teams get the tools they need for experimentation, training, and production inference, with security, observability, and control built in.

We serve solo researchers, startups, and large enterprises. Lightning AI operates globally with offices in New York City, San Francisco, Seattle, and London, and is backed by Coatue, Index Ventures, Bain Capital Ventures, and Firstminute.

Focus: We complete one goal at a time with care, collaborating as a team to deliver features with precision. Sustained performance comes from rest and recovery. We ensure a healthy work-life balance to keep you at your best. Innovation through excellence. Every detail matters, and we take pride in mastering our craft. Simplicity drives our innovation.

We are looking for a Backend Engineer to work on developing and scaling the Lightning AI platform from the frontend, CLI, and API, to billing, security, and integrations. Here, you’ll build from proof of concept to release with a focus on speed, quality, and iteration. This is an opportunity to create groundbreaking technology that will transform the machine-learning ecosystem!

This is a hybrid role based in our London office with in-office requirements of 2 days per week. Master 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. Champion software quality, implement automation, drive continuous delivery, and reduce time to production while proactively reducing technical debt.

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. Commitment to software quality, test automation, and continuous delivery. Hands-on experience as a backend or product engineer in a SaaS technology company.

We offer competitive base salaries and equity with a 25% one year cliff and monthly vesting thereafter. For our international employees, we work with our EOR to pay you in your local currency and provide equitable benefits across the globe. Medical, dental and vision ~ Life and AD&D insurance ~ Flexible paid time off including winter closure ~ Paid family leave benefits ~ $500 one time home office stipend ~ $45/month gym membership ~ Additional various medical and mental health services.

At Lightning AI, we are committed to fostering an inclusive and diverse workplace. 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.