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.

Our aim is 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 cost 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!

As a key member of the founding engineering team, you’ll own end-to-end delivery of product features across the stack, with a strong emphasis on robust back-end services, APIs and data-powered functionality. You’ll work closely with the founders, other engineers and data science 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 impact is very important to you. You fear looking back in 10 years time 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.

• Work with commercial and product to understand customer & internal needs; shape technical solutions and roadmap
• Design, build and own backend services, domains, and APIs - i.e. billing, pricing, forecasting
• 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
• Implement data-aware features: caching, background jobs, ETL/ELT hooks, and pipelines that support analytics and ML features
• Configure, monitor and maintain appropriate logging, monitoring and observability systems
• Implement key front-end user flows
• Set engineering standards: testing, CI/CD, observability, cost/performance monitoring, security and privacy guardrails
• Ship fast: prototype, launch, measure and iterate with customers; maintain runbooks and documentation

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 or Backend engineer
• Deep proficiency in backend runtimes (ideally Go and Python) plus strong frontend experience (ideally Typescript and React)
• Experience handling data at scale, and building architectures and systems to handle such scale
• Comfortable with OLTP/OLAP databases: schema design, query optimisation and data modelling for time-series & transactional and analytical needs
• 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

• Building and owning products end-to-end in early-stage startups; balancing speed with technical debt management
• Time-series/data-intensive features (i.e. metering, forecasting inputs, settlement/billing data) and basic data tooling (dbt/Airflow/Prefect)
• 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)

• 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 impact quickly. You want to get sh*t done.
• 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.

• 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

Apply via LinkedIn or send a short note (with your LinkedIn or CV) to

📩 [email protected]