Pre-Sales Senior Engineer

Job title: Pre-Sales Senior Engineer

Location: London/Bristol - Hybrid

Salary: £56,000 - £70,000

Team: Commercial

Reporting To: Head of Client Solutions

Closing date for applications: Monday 6th April 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. Leveraging Data, AI, and real-time decision-making we turn energy complexity into growth opportunities for our partners.

By combining predictive algorithms with human-centred design, Kaluza makes clean energy dependable and affordable.

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?

As a Senior Pre-Sales Engineer, you are a "developer-plus" technical contributor. You are responsible for building high-quality mock backends, APIs, and demo infrastructure, but with a unique twist: you leverage LLMs and Generative AI to prototype at high velocity.

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:

• AI-Accelerated Prototyping: Leverage LLMs (e.g., Claude and Gemini) to rapidly scaffold, build, and iterate on proof-of-concept apps and mock services. You move faster than a traditional sprint by using AI to handle the "heavy lifting" of boilerplate and logic generation.
• 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.
• AI Evangelism: Act as the resident expert in GenAI workflows for the Commercial team, mentoring others on how to use AI to bridge the gap between "slide-ware" and "software."

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 software engineer by trade but a prototyper by heart. You understand the rigour of clean code but know when to lean into AI to accelerate delivery. You are motivated by the immediate impact of winning new clients and validating Kaluza’s value proposition in real-time.

Ideally you’ll have/be:

• Software Engineering Foundation: Strong hands-on experience in Node.js / TypeScript and React. You know how to write code from scratch, which is why you’re so good at prompting AI to do it for you.
• GenAI Power User: Deep experience leveraging LLMs and Generative AI to build apps, debug complex issues, and accelerate the development lifecycle. You aren't just using an AI assistant; you are "vibe coding" complete PoCs.
• 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.
• Pragmatic & Autonomous: Comfortable operating with ambiguity, translating vague client requirements into working systems through a high degree of initiative.

What will set you apart

• The "Prototyper" Portfolio: A track record of building internal tools, sales demos, or high-fidelity PoCs using AI-first workflows.
• 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:

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

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 at Kaluza on our careers page and LinkedIn.

You can also find our Applicant Data Protection Policy here.