Application Guide

How to Apply for Senior Software Engineer I

at Kaluza

🏢 About Kaluza

Kaluza is a B2B energy tech company that provides intelligent software to energy suppliers, enabling them to accelerate decarbonisation. Their platform manages millions of smart home devices and real-time energy data, making them a key player in the green energy transition. Working here means contributing to a mission-driven team that values innovation, collaboration, and engineering excellence.

About This Role

As a Senior Software Engineer I, you will build and maintain backend services using TypeScript within an event-driven architecture, powering real-time features for the Energy Retail platform. You will own services end-to-end, from design to production, and collaborate closely with product and design teams to deliver customer-focused solutions. Your work will directly impact the reliability and scalability of systems that help suppliers manage energy for millions of customers.

💡 A Day in the Life

Your day might start with a stand-up with your cross-functional team, discussing progress on a new event-driven feature for real-time energy pricing. You'll then dive into coding a TypeScript service that processes smart meter data via AWS Lambda and SQS, followed by a design review with a product manager to refine the API contract. After lunch, you might pair with a junior engineer on optimising a DynamoDB query, then wrap up by deploying a fix to production and monitoring it via Datadog.

🚀 Application Tools

Generate Cover Letter

AI-powered, tailored for Kaluza

Interview Prep

Practice questions for this role

🎯 Who Kaluza Is Looking For

  • Deep experience building backend services with TypeScript, including async/await, generics, and modular design patterns.
  • Proven track record designing and operating event-driven systems (e.g., AWS SQS/SNS, Kafka, or RabbitMQ) with an understanding of eventual consistency and idempotency.
  • Hands-on experience with AWS serverless technologies (Lambda, DynamoDB, API Gateway) and infrastructure-as-code (CDK or Terraform).
  • Skilled in database design and optimisation, whether SQL (PostgreSQL) or NoSQL (DynamoDB), including indexing strategies and query performance tuning.

📝 Tips for Applying to Kaluza

1

Tailor your CV to highlight TypeScript backend experience and event-driven architecture projects—Kaluza's stack is TypeScript-first on the backend.

2

Mention any experience with AWS serverless services like Lambda, DynamoDB, and SQS; if you've used CDK, emphasise that.

3

Showcase ownership: include examples where you took a service from design to production, including monitoring and incident response.

4

Quantify impact: use metrics like latency reduction, throughput improvement, or cost savings from optimisation.

5

Demonstrate collaboration: mention cross-functional work with product managers and designers to ship customer-facing features.

✉️ What to Emphasize in Your Cover Letter

["Your passion for decarbonisation and how your engineering skills can directly contribute to Kaluza's mission.", 'Specific examples of building event-driven backend services with TypeScript and AWS serverless.', 'Your experience owning services end-to-end, including design, deployment, and production support.', 'Your collaborative approach to working with product and design teams to deliver user-centric solutions.']

Generate Cover Letter →

🔍 Research Before Applying

To stand out, make sure you've researched:

  • → Read Kaluza's engineering blog (if available) to understand their tech stack, architecture decisions, and culture.
  • → Familiarise yourself with the UK energy market and the role of smart meters, time-of-use tariffs, and demand-side response.
  • → Understand Kaluza's platform: how it integrates with energy suppliers, manages devices, and processes real-time data.
  • → Look at their recent news or press releases about partnerships or product launches to show awareness during interviews.

💬 Prepare for These Interview Topics

Based on this role, you may be asked about:

1 Design a real-time event-driven system for energy data ingestion (e.g., smart meter readings) using AWS services.
2 How would you handle duplicate events in a queue-based system? Discuss idempotency and deduplication strategies.
3 Optimise a slow database query in a PostgreSQL or DynamoDB context—walk through indexing, caching, or schema changes.
4 Describe a time you improved the reliability of a production service. What monitoring and alerting did you set up?
5 How do you ensure backward compatibility when evolving an event schema? Discuss versioning and migration strategies.
Practice Interview Questions →

⚠️ Common Mistakes to Avoid

  • Submitting a generic application that doesn't mention TypeScript, event-driven systems, or AWS serverless—Kaluza's core stack.
  • Focusing only on frontend or mobile experience without demonstrating backend depth—this role is backend-heavy.
  • Ignoring the mission: failing to connect your work to decarbonisation or energy efficiency may signal misalignment.

📅 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 →