Pre-Sales Senior Engineer (Energy Retail) in London

Requirements

• 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.
• 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.
• 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 (Desirable).
• The "Prototyper" Portfolio: A track record of building internal tools, sales demos, or high-fidelity PoCs using AI-first workflows (Desirable).
• Energy Sector Insight: Understanding the specific challenges facing energy retailers globally (Desirable).
• Auth & Security Savvy: Practical knowledge of OIDC-based authentication flows (Desirable).
• Design Thinking: A talent for sharing UX/UI design thinking with wider product teams.

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.

What the job involves

• Reporting To: Head of Client Solutions.
• 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, leveraging 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.
• AI-Accelerated Prototyping: Leverage LLMs (e.g., Claude and Gemini) to rapidly scaffold, build, and iterate on proof-of-concept apps and mock services.
• 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."