Senior Engineer I

Job Title: Senior Engineer I

Location: Paris (Hybrid)

Salary: €54,000 - €70,000

Team: Client Engineering 

Reporting To: Software Engineering Manager

This role is based in Paris and requires an existing right to work in France. At this time, we are not able to offer visa sponsorship for this role. We are committed to building a diverse, global team and our sponsorship policy is evaluated on a role-by-role basis. We encourage you to keep an eye on our careers site to stay informed about future opportunities where we are able to offer visa sponsorship.

Kaluza is the Energy Intelligence Platform, turning energy complexity into seamless coordination. We help energy companies overcome today’s challenges while accelerating the shift to a clean, electrified future.

Our platform orchestrates millions of real-time decisions across homes, devices, markets and grids. By combining predictive algorithms with human-centred design, Kaluza makes clean energy dependable, affordable and adaptive to everyday life.

With teams across Europe, North America, Asia and Australia, and a joint venture with Mitsubishi Corporation in Japan, we power leading companies including OVO, AGL and ENGIE, as well as innovators like Volvo and Volkswagen.

What will I be doing?

• Hands-on Execution: Write clean, well-tested, and maintainable TypeScript code to build and extend Kaluza's platform capabilities for our major clients, including ENGIE.
• Serverless Development: Build, deploy, and maintain highly scalable applications leveraging cloud-native AWS Serverless infrastructure (e.g., Lambda, API Gateway, DynamoDB).
• Creative Problem Solving: Take ownership of features from conception to deployment, breaking down complex client-facing requirements into event-driven cloud architectures.
• Technical Quality & Mentorship: Champion engineering best practices within the team, conducting thorough code reviews, and upskilling more junior engineers on modern TypeScript and serverless design patterns.
• Architecture & Scale: Help design scalable microservices and robust integrations, focusing heavily on real-time data streaming and event-driven patterns with Kafka.
• Team Collaboration: Collaborate closely with your team, Product Managers, and Engineering Managers to refine features, estimate tasks, and deliver value predictably.
• Operational Excellence: Help monitor, maintain, and optimize production workloads, ensuring optimal observability and cloud resource efficiency.

About You

Ideally you'll have/be:

• TypeScript Expertise: Strong professional experience building scalable, production-grade applications predominantly using TypeScript and Node.js.
• AWS Serverless Proficiency: Hands-on experience designing and running production systems using AWS Serverless architectures.
• Distributed Systems: Practical experience working with modern, distributed cloud architectures and event-driven systems (e.g., Kafka).
• Problem-Solving Mindset: A track record of creative problem-solving and delivering team-level technical expertise on complex application workflows.
• Agile Practices: A solid grasp of software development fundamentals, continuous integration/continuous deployment (CI/CD), and Agile/Lean methodologies.
• Collaborative Communicator: Excellent communication skills, with a passion for working across a cross-functional team and explaining technical concepts clearly.

What will set you apart:

• Infrastructure as Code (IaC): Framework experience managing serverless configurations (e.g., AWS CDK, Serverless Framework, or SAM).
• Energy or Enterprise Domain Knowledge: Background working with large enterprise applications, specifically involving billing, ledger tooling, payments integration, or energy grid/supply data.
• Client-Facing Awareness: Previous experience working on consulting, software-as-a-service (SaaS) onboarding, or client-delivery technical projects.

Kaluza Values

Here at Kaluza we have five core values that guide us as a business:

Play to win, Solve the real problem, Build trust every day, Own the outcome, Go further together.

We want the best people

We’re keen to meet people from all walks of life — our view is that the more inclusive we are, the better our work will be. We want to build teams which represent a variety of experiences, perspectives and skills, and we recognise talent on the basis of merit and potential.

We understand some people may not apply for jobs unless they tick every box. But if you're excited about joining us and think you have some of what we're looking for, even if you're not 100% sure, we'd still love to hear from you.

Find out more about working in Kaluza on our careers page and LinkedIn.

You can also find our Applicant Data Protection Policy here.