Full-Stack Engineer (Backend Focus)

About Volter

Volter is a top-tier climate VC-backed B2B energy tech platform building the products that make clean, renewable power simple for businesses everywhere. The energy transition is a huge and vital opportunity, but it's currently too difficult for commercial & industrial companies to achieve. Historically, the energy industry has been too opaque, complex and lacking in trust. We’re fixing that. We aim to be the “Octopus Energy for industry”: a modern tech platform providing new renewable energy products with radical transparency — accelerating deployment of renewables and helping customers cut costs and carbon without complexity.

We’re excited to use technology to help our customers deploy & utilise more renewable energy and fast-forward the energy transition - and we need your help!

Role: Engineer

As a key member of the founding engineering team, you'll own end-to-end delivery of product features across the stack, building both the customer-facing interfaces and the backend services, APIs and data-powered functionality behind them. You’ll work closely with the founders, other engineers and data scientists to ship customer- and internal-facing features at high velocity—days, not weeks—while laying pragmatic, scalable foundations for our supply operations (pricing, billing, data ingestion).

You are a self-starter who excels both independently and in a team. You dislike corporate structure and bureaucracy, and believe in a "best idea wins" culture. This is why you prefer a growth-oriented, flat, startup environment.

A desire to keep learning and having an impact is very important to you. You fear looking back in 10 years and realising you never made a difference…that you were simply a tiny cog in a large machine that will churn with or without you.

Day-to-day responsibilities

• Work with commercial and product to understand customer & internal needs; shape technical solutions and roadmap

• Design, build and own features end-to-end, from backend services and APIs (i.e. billing, pricing, forecasting) through to the user-facing flows on top of them

• Build ETL pipelines to integrate with third-party systems and data sources (smart-meter/HHD feeds, market/price data, network tariff tables) with attention to data quality

• Configure, monitor and maintain appropriate logging, monitoring and observability systems

• Contribute to engineering standards: testing, CI/CD, observability, security and privacy guardrails

• Ship fast: prototype, launch, measure, and iterate with customers; maintain runbooks and documentation

What experience you bring

We are looking for an experienced Engineer who is excited by the idea of building and owning something from the very beginning, and ideally has a strong background in backend and interest/ experience in handling data.

• ~4–8 years building and operating production applications as a Full Stack engineer with strong backend skills

• Strong proficiency across the stack: backend (ideally Go and/or Python) and frontend (ideally TypeScript and React)

• Comfortable working with data-intensive features, architectures, systems and an appetite to keep improving how to scale them

• Proficient with data: schema design, query optimisation and data modelling with time-series data

• Experience designing and consuming REST APIs; event-driven patterns and background workers

• Cloud deployment with cloud providers; infrastructure-as-code (we use Terraform) and CI/CD

• Strong software engineering fundamentals: testing, code reviews, reliability/observability, performance and security-by-default

Stand‑out candidates will have experience in…

• Building and owning products end-to-end in early-stage startups; balancing speed with technical debt management

• Building pipelines for external integrations and internal operations, bonus points for time-series and/or data-intensive features

• Software development in the renewables/energy space

• Collaborating with data scientists: feature serving, batch/real-time scoring, experiment tracking

• Security and compliance-aware development (least-privilege, auditability, PII handling)

Who you are

• You are energised by early-stage businesses and thrive within startup environments.

• You are an innovative thinker who is also curious and eager to continuously learn and progress.

• You have a strong bias to action and having an impact quickly. You want to get sh*t done.

• You can take an ambiguous problem and run with it independently, while knowing when to pull others in.

• You care about customer experience as much as elegant code, and you iterate based on real feedback.

• You communicate clearly and enjoy turning messy problems into simple, robust software.

• You are a self-starter and autonomous in your way of working, but ultimately believe a team can get further together than any individual.

What you can expect from us

• A dynamic and fast-changing environment with incredible responsibility and autonomy

• Working directly with and learning from experienced startup founders who’ve invested in and scaled businesses up to several billion dollars in valuation

• The ability to build and own something from the very beginning

• Working on market-leading and genuinely impactful products that help solve the climate crisis

• A kick-ass team of colleagues

• We value in-person time at our office in London, but offer hybrid/flexible working

• Competitive compensation based on candidate profile with generous employee equity