Pre-Sales Engineer

Job title: Pre-Sales Senior Engineer - Energy Retail

Location: London/Bristol - Hybrid

Salary: £56,000 - £70,000

Team: Commercial

Reporting To: Head of Client Solutions 

Closing date for applications: Monday 9th February 2026

This role is based in London or Bristol and requires existing right to work in the UK. 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.

At Kaluza we embrace a flexible, hybrid work model that balances autonomy with the power of in-person connection. Many of our teams find value in coming together regularly to collaborate, strengthen relationships, and accelerate progress. We’re focused on shaping thoughtful, team-driven approaches that support both business impact and individual well-being.

What will I be doing?

As a Senior Pre-Sales Engineer, you are a developer-first technical contributor responsible for building high-quality mock backends, APIs, and demo infrastructure that enable realistic product demonstrations and proof-of-concepts (PoCs).

This role sits at the critical boundary between Product Engineering and Go-to-Market. While you won't build production systems, you will build "production-shaped" assets: reusable, well-structured, and documented services that enable credible technical storytelling and high-fidelity client validation.

Your core responsibilities will include:

• Technical Asset Development: Design, build, and maintain reusable mock services in Node.js / TypeScript. You’ll implement contract-first APIs (REST/GraphQL), manage AWS deployments (API Gateway, Containers), and handle persistence using PostgreSQL or DynamoDB.
• Infrastructure as Code: Manage demo environments using Terraform, ensuring environments are reproducible and secure using existing OIDC authentication patterns.
• Frontend Collaboration: Work closely with frontend engineers to ensure UI components point cleanly to your mock services, debugging integration issues and supporting end-to-end demo flows.
• Strategic Pre-Sales Support: Partner with Pre-Sales consultants to translate client "win themes" into working technical artefacts. You will occasionally demo directly to clients, showcasing how Kaluza solves their specific retail challenges.
• Product & UX Influence: Collaborate with Design and Product teams for UI direction while developing your own design ideas to make Kaluza’s capabilities shine.
• Mentorship & Standards: Set informal engineering standards for the pre-sales team, mentoring others on API design and architecture.

What this role is NOT:

• A pure presentation-led role (you will be writing code regularly).
• Shipping production code (your value comes from building things that work for a demo, not maintaining production SLOs).

About You

You are a builder who thrives on the variety and pace of the sales cycle. You have an engineering mindset—valuing readable code and clear contracts—but you are motivated by the immediate impact of winning new clients and validating Kaluza’s value proposition.

Ideally you’ll have/be:

• Strong Software Engineering Skills: Hands-on experience building services in Node.js / TypeScript and working within React environments.
• API Design Expert: Experience designing clean, well-documented APIs (REST and/or GraphQL) and using Git/Github workflows effectively.
• Cloud & Infrastructure Knowledge: Familiarity with AWS primitives and a proven ability to deploy infrastructure using Terraform or similar IaC tools.
• Pragmatic & Autonomous: Comfortable operating with ambiguity, translating vague client requirements into working systems through a high degree of initiative.
• Collaborative Communicator: A team player who can build bridges across Commercial, Product, and Engineering teams, sharing knowledge and learning without prompting.
• Entrepreneurial Mindset: A "start-up" mentality with the ability to self-organise and respond quickly to changeable schedules and events.

What will set you apart

• Tooling & Demo Specialist: Specific experience building internal tools, sales demos, or high-fidelity PoCs in a SaaS environment.
• Energy Sector Insight: Understanding the specific challenges facing energy retailers globally.
• Auth & Security Savvy: Practical knowledge of OIDC-based authentication flows.
• Design Thinking: A talent for sharing UX/UI design thinking with wider product teams.

Kaluza Values

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

We’re on a mission, We build together, We’re inclusive, We get it done, We communicate with purpose.

Read more about our values over on our careers site.

From us you’ll get

• Pension Scheme
• Discretionary Bonus Scheme
• Private Medical Insurance + Virtual GP
• Life Assurance
• Access to Furthr - a Climate Action app
• Free Mortgage Advice and Eye Tests
• Perks at Work - access to thousands of retail discounts
• 5% Flex Fund to spend on the benefits you want most
• 26 days holiday

• Flexible bank holidays, giving you an additional 8 days which you can choose to take whenever you like

• Progressive leave policies with no qualifying service periods, including 26 weeks full pay if you have a new addition to your family 
• Dedicated personal learning and home office budgets
• And more…

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.