Software Engineer, Backend Developer

Software Engineer

Department: Factor

Employment Type: Permanent - Full Time

Location: London, UK

At Factor, we’re building the commercialisation layer for the new energy economy. Our engineers don’t just write code — they shape the foundations of a platform designed to transform how energy is priced, forecast, and delivered globally.

As an engineer, you will play a pivotal role in developing the core of our system: scalable data pipelines, pricing engines, and APIs that support real‑time decision making for energy retailers and their customers. You’ll work in a highly capable senior team, where ownership, curiosity, and engineering excellence are expected — and where AI tools are used daily to multiply impact and velocity.

• Build and ship backend features and services with a focus on elegance, scalability, performance, and resilience.
• Design and evolve Factor’s core data and application architecture (Typescript rust, AWS, etc).
• Solve complex, end‑to‑end problems across the stack, from data ingestion and transformation, complex algorithms, through to APIs and partner integrations
• Contribute to engineering standards, peer reviews, and design discussions that raise the technical bar.
• Use AI and automation to accelerate development cycles, testing, and deployment.
• Help shape a culture of technical excellence, collaboration, and high ownership.

• Proficiency in Node.js, Python, PostgreSQL, and modern cloud architecture (AWS, serverless).
• Track record of designing and maintaining clean, maintainable systems that handle complex data and business logic.
• Experience in the energy sector (or other data-heavy, mission‑critical industries) is highly valued.
• Comfortable working autonomously in a fast‑moving startup environment; proactive in surfacing problems and proposing solutions.
• Thrives on responsibility and ownership, with a low‑ego, high‑collaboration style.
• Excited by the opportunity to apply your skills to one of the world’s biggest challenges: the energy transition.

• Competitive salary
• Private medical insurance
• Life and income protection
• 24-days annual leave
• Enhanced parental leave
• Tailored learning and development opportunities
• Flexible working hours and remote‑work opportunities