Senior Software Engineer, Energy Billing

About the role

Reel is building a purpose‑built energy billing platform that turns complex renewable‑energy transactions into clear monthly invoices. As a Senior Software Engineer you will own and evolve this platform, working closely with the CTO, engineering teammates, and the electricity operations team.

Key responsibilities

• Lead the continuous improvement and expansion of the energy billing platform to support new products and markets.
• Design and implement integrations for different market rules, data formats, and quirks.
• Structure financial data for accurate analytics, reporting, and automated settlement workflows.
• Build internal tooling that gives the operations team full visibility and automated error detection.
• Perform code reviews, influence technical decisions, and help shape the future direction of the stack.

Required profile

• Proven experience shipping production backend software and taking ownership of features.
• Comfort with financial‑type systems such as billing, payments, or settlement.
• Strong focus on reliability, scalability, and pragmatic simplicity.
• Ability to work independently, make confident decisions, and collaborate when needed.
• Interest in leveraging AI tools to improve development processes.

Required skills

• Elixir and the Phoenix framework (including LiveView).
• TypeScript for front‑end development.
• Python for machine‑learning and trading components.
• Google Cloud Platform (GCP) hosting.
• PostgreSQL with TimeScaleDB and BigQuery for data storage and analysis.

What we offer

• Competitive base salary plus a warrant programme.
• 30 days of paid vacation.
• Employer‑supported pension and health insurance.
• Equipment budget of 25,000 DKK for your preferred IT setup.
• Office‑first culture in central Copenhagen with flexible hybrid work.
• Daily lunch, espresso, monthly socials, and bi‑annual offsites.