Application Guide
How to Apply for Senior Backend Engineer - Low Carbon Tech (LCT)
at Octopus Energy
🏢 About Octopus Energy
Octopus Energy is a disruptor in the energy sector, leveraging AI and renewables to drive a low-carbon future. Their tech-first culture and commitment to transparency make them a standout employer for engineers passionate about climate impact.
About This Role
As a Senior Backend Engineer, you'll own critical platform components, ensuring scalability and reliability while mentoring peers. Your work directly enables cleaner energy systems, from optimizing database queries for real-time grid data to integrating AI for predictive maintenance.
💡 A Day in the Life
Morning standup with your team to discuss progress on a new microservice for energy trading. Afternoon spent profiling a PostgreSQL query causing latency, pair programming with a junior engineer to optimize it. End the day reviewing a colleague's PR and testing an AI-generated code snippet for a new feature.
🚀 Application Tools
🎯 Who Octopus Energy Is Looking For
- 5+ years backend experience with deep expertise in PostgreSQL/MySQL optimization, including indexing, query tuning, and schema design.
- Proven track record of designing and scaling multi-service architectures in cloud environments (AWS preferred).
- Hands-on experience integrating AI tools (e.g., LLMs for code generation) into workflows, with strong discipline to validate outputs.
- Excellent communicator who can translate complex technical risks (e.g., latency bottlenecks) to non-technical stakeholders like product managers.
📝 Tips for Applying to Octopus Energy
Highlight specific examples of systemic debugging (e.g., resolving cascading failures in microservices) in your resume.
Mention any experience with energy sector APIs or real-time data pipelines (e.g., IoT sensor streams).
Showcase a project where you mentored junior engineers and improved code review practices.
Tailor your cover letter to emphasize AI integration in your workflow—mention tools like GitHub Copilot or custom LLM scripts.
Include a link to a public code sample (GitHub) that demonstrates self-documenting code and testing strategies.
✉️ What to Emphasize in Your Cover Letter
["Your passion for low-carbon tech and how your backend skills can accelerate Octopus's mission.", 'Concrete examples of taking technical ownership (e.g., redesigning a critical service to reduce latency by X%).', 'How you use AI to iterate quickly while maintaining high code quality (e.g., automated testing pipelines).', "Your mentoring philosophy and how you've left systems stronger (e.g., implemented new monitoring practices)."]
Generate Cover Letter →🔍 Research Before Applying
To stand out, make sure you've researched:
- → Read Octopus Energy's tech blog (e.g., on Kraken platform) to understand their stack and engineering culture.
- → Study their approach to AI in energy, such as using machine learning for demand forecasting.
- → Review their public GitHub repos for code style and testing patterns.
- → Look into their carbon offset initiatives and how technology supports their net-zero goals.
💬 Prepare for These Interview Topics
Based on this role, you may be asked about:
⚠️ Common Mistakes to Avoid
- Submitting a generic cover letter that doesn't mention AI or low-carbon tech specifics.
- Overlooking non-functional requirements like security and scale in your examples.
- Failing to demonstrate mentorship experience—this role expects you to leave people stronger.
📅 Application Timeline
This position is open until filled. However, we recommend applying as soon as possible as roles at mission-driven organizations tend to fill quickly.
Typical hiring timeline:
Application Review
1-2 weeks
Initial Screening
Phone call or written assessment
Interviews
1-2 rounds, usually virtual
Offer
Congratulations!
Ready to Apply?
Good luck with your application to Octopus Energy !