Application Guide

How to Apply for Senior Software Engineer I (Flex)

at Kaluza

🏢 About Kaluza

Kaluza is an energy intelligence platform that leverages data, AI, and real-time decision-making to help energy companies navigate complexity and accelerate the clean energy transition. With a global presence and partnerships with major players like OVO, AGL, and Volkswagen, Kaluza offers a unique opportunity to work on impactful technology that directly contributes to decarbonisation.

About This Role

As a Senior Engineer I on the Flex platform team, you will build systems that connect energy retailers, grid operators, and other stakeholders to enable flexible energy management. Your work will directly support the integration of renewable energy sources and help make clean energy more dependable and affordable.

💡 A Day in the Life

You’ll start your day with a stand-up with your remote team, discussing progress on integrating a new energy retailer’s systems. You’ll spend the morning coding a new event processor for real-time demand data, then pair with a colleague on optimizing a microservice. After lunch, you’ll review a design doc for a new feature enabling grid operators to send flexibility signals, and end the day with a retrospective on the sprint.

🚀 Application Tools

Generate Cover Letter

AI-powered, tailored for Kaluza

Interview Prep

Practice questions for this role

🎯 Who Kaluza Is Looking For

  • Proven experience in senior-level software engineering, ideally in energy, fintech, or other complex distributed systems (e.g., 5+ years).
  • Strong proficiency in languages like Kotlin, Java, or Python, and familiarity with cloud-native architectures (AWS, GCP, or Azure).
  • Experience with real-time data processing, event-driven systems, or microservices architecture.
  • Passion for sustainability and the energy transition, with the ability to work collaboratively in a hybrid/remote team across time zones.

📝 Tips for Applying to Kaluza

1

Highlight any experience with energy systems, smart grids, or IoT devices in your resume and cover letter.

2

Quantify your impact in previous roles (e.g., 'Reduced latency by 30%' or 'Scaled system to handle 10x traffic').

3

Tailor your application to mention Kaluza's mission and how your values align with decarbonisation.

4

If you have experience with Kotlin or event-driven systems, make it prominent.

5

Ensure your application clearly states your eligibility to work in the UK without visa sponsorship.

✉️ What to Emphasize in Your Cover Letter

["Express enthusiasm for Kaluza's mission to empower energy suppliers and drive decarbonisation.", 'Describe a specific project where you built scalable, real-time systems that solved complex problems.', 'Mention your collaborative approach and experience working in cross-functional teams across different geographies.', 'Explain why you are interested in the Flex team specifically and how your skills can help connect energy stakeholders.']

Generate Cover Letter →

🔍 Research Before Applying

To stand out, make sure you've researched:

  • → Read Kaluza's blog or press releases about their partnerships with OVO, AGL, and Volkswagen.
  • → Familiarize yourself with the Flex platform's role in demand-side response and grid balancing.
  • → Review Kaluza's tech stack (e.g., Kotlin, AWS, Kafka) and recent engineering challenges they've shared.
  • → Understand the UK energy market context, including the role of flexibility services and smart grids.

💬 Prepare for These Interview Topics

Based on this role, you may be asked about:

1 System design: Design a real-time energy demand-response system handling thousands of devices.
2 Behavioral: Describe a time you had to balance technical debt with new feature delivery.
3 Technical: How would you handle data consistency in a distributed event-driven architecture?
4 Domain: What do you understand about flexibility in energy markets and how software enables it?
5 Coding: Implement a rate-limiter or a simple event processing pipeline.
Practice Interview Questions →

⚠️ Common Mistakes to Avoid

  • Applying with a generic resume that doesn't mention energy or real-time systems experience.
  • Overlooking the no-visa-sponsorship requirement and applying without checking eligibility.
  • Focusing only on backend skills without demonstrating understanding of distributed systems or event-driven architecture.

📅 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:

1

Application Review

1-2 weeks

2

Initial Screening

Phone call or written assessment

3

Interviews

1-2 rounds, usually virtual

✓

Offer

Congratulations!

Ready to Apply?

Good luck with your application to Kaluza!

← Back to Job Listing Apply Now →