Principal Developer/Solution Architect

Reporting to the IT Director, Own the architecture, the key technical decisions and the canonical platform API for a new digital energy retail platform — Spain first, built for multi-country rollout.

Key Responsibilities

• Own the overall architecture for the platform, documenting key decisions in ADRs and setting coding standards and architecture patterns used across the squads.
• Own the canonical experience API and the anti-corruption layer— the design authority that keeps legacy structure, identifiers and state from leaking into customer-facing services.
• Own the country-abstraction model so the platform runs as one deployment with country as configuration, protecting the scalability of the global core as new markets are added.
• Lead the design and guide implementation of mobile apps, APIs, backend services, integrations, data flows, and frontend composition patterns.
• Lead on the use of code-gen AI tools within an Agile framework, setting technical standards, implementing skills, and defining specs.
• Lead technical design reviews and establish quality gates across backend, frontend, data, and QA activities.
• Partner with the Product Owners and the Platform Engineer to balance speed, technical debt, security, regulatory needs, and long-term platform scalability.
• Coordinate with the legacy platform team, third-party providers (billing/switching, energy-asset connectivity) and internal architecture/security teams.
• Mentor engineers and promote modern engineering practices: AI code gen, CI/CD, automated testing, observability, documentation, and secure coding.

• Proven experience as Principal Developer or hands-on Solution Architect in a digital product environment with a large customer base.
• Demonstrable experience designing anti-corruption layers or strangler-pattern integrations over an existing or legacy platform, keeping a clean domain model independent of the underlying system.
• Experience working with the latest AI software development tools such as Claude Code/Codex, skills and specs.
• Strong knowledge of building cloud-native architectures, APIs, microservices, event-driven patterns and integration design.
• Strong, current hands-on experience with a backend stack such as Java/Spring or ASP.NET for building web services, APIs and web apps
• Solid understanding of how mobile and web frontends (e.g. React Native, Next.js) consume APIs, enough to design composition patterns and BFF boundaries for them.
• Experience designing for multiple countries or markets from a single platform core.
• Experience with CI/CD, automated testing, observability, security-by-design, and production operations.
• Professional written and spoken English is required. Spanish, Italian or French are considered as a plus.

MET Group is an integrated European energy company headquartered in Switzerland, active across the full value chain - generation, storage, LNG, trading and sales. Present in 24 countries and 33 national energy markets, MET combines large-scale trading with a growing portfolio of renewable and flexible assets. In 2025 the group generated €28.6 billion in consolidated revenue. 

MET Retail is a new chapter for the group: bringing energy directly to households. We're building a technology-driven retail platform for power and gas, with a digital, customer-first model. One model, built to scale across Europe. We're a small international team, and there's a lot to build. Join us on this exciting journey and you'll help shape how this company works, with real ownership from day one.