Senior Full-Stack Engineer (Global | Remote | English)

🌍 Senior Full-Stack Software Engineer (Global | Remote | English)

Location: Fully Remote (Europe-friendly overlap preferred; other time zones considered with sufficient overlap)Employment Type: Full-Time/ContractorLanguages Required: English fluencyExperience: Senior 6-10 year experience, ideally large history of open-source contributionsSalary Range: 40-130kEURReports to: Head of Software EngineeringTravel Requirements: Occasional travel to workshops or team events neededStart Date: Early/Mid 2026 (TBD)

About the Organization:

Open Energy Transition (OET) is a remote-first non-profit building open-source tools and data for energy and grid planning. We exist to make energy planning more transparent, reproducible, and accessible - and to help open approaches become the global standard by 2030.

Role Overview:

We’re hiring a Senior Full-Stack Software Engineer to help us build and improve applications across OET: product-grade web apps, dashboards, data tools, and internal platforms that support modelling workflows and real-world decision-making. 

You’ll work across the stack, frontend, backend, and data layer, to ship new capabilities, modernize existing systems, and raise reliability and developer velocity. The scope is intentionally broad: some work will be user-facing (dashboards, reporting, results exploration), some will be platform-facing (APIs, databases, automation), and some will be glue work that turns modelling outputs into usable applications.

This is a hands-on role for someone who ships, cares about quality, and enjoys building pragmatic systems that others can trust.

🌱 Open Source at OET:

We build in the open. This role includes helping us ship and maintain open-source software responsibly — strong documentation, tests, contributor workflows, and a bias toward upstreaming improvements when it makes sense.

Key Responsibilities:

• Build and evolve web applications and dashboards (results exploration, reporting, operational tools).

• Improve and maintain existing platforms: refactors, performance, UX improvements, and reliability work.

• Design and implement APIs + data models that make data easy to query, audit, and reuse.

• Create critical automation: scripts, tooling, and reproducible environments that reduce manual work.

• Integrate with Python-first pipelines and modelling workflows (ETLs, orchestration tools like Snakemake, Apache Airflow or similar).

• Own quality via CI/CD, pragmatic testing, and stable deployments.

• Communicate clearly in a remote-first team: async docs, high-signal PRs, and thoughtful reviews.

Qualifications:

• Senior experience shipping full-stack products end-to-end.

• Experience building cloud services and web apps, and setting up and managing their databases

• Bachelor's degree in Computer Science, Software Engineering, etc, or equivalent experience

• Strong analytical and problem-solving skills

• Fluency in Python and JavaScript, and their environments (venv, conda/mamba, pixi)

• Fluency in backend and frontend frameworks (Flask, React, Angular, Vue) and languages (JS, TypeScript, Rescript)

• Experience with CI/CD (e.g., GitHub Actions, GitLab, Jenkins), containerization tools (e.g.,Docker, Kubernetes, OpenTofu) and scripting languages (e.g., Python, Bash, Golang).

• Nice to have:

• Data processing experience (e.g., Snakemake, Apache Airflow), or willingness to learn

• Software deployment and scaling skills (Kubernetes, OpenTofu/Terraform, Nix/NixOS).

• Expertise with cloud platforms and services (e.g. GCP, AWS, Azure), knowledge of HPC tools (e.g., SLURM).

• Experience with working with distributed web apps and microservices.

• Effective asynchronous communication skills, ability to work independently, and a growth mindset is a must!

• Interest in open-source collaboration

What We Offer:

• Mission-driven climate-tech work with real-world adoption.

• Ownership, autonomy, and the chance to shape how we build.

• Competitive salary, comprehensive benefits, and a dynamic work environment.

• Opportunities for professional growth within a globally recognized and respected organization.

This role creates positive change by building open-source tools and data for energy and grid planning, making energy planning more transparent, reproducible, and accessible to help open approaches become the global standard by 2030.

Required qualifications:

• Senior experience shipping full-stack products end-to-end
• Experience building cloud services and web apps, and setting up and managing their databases
• Bachelor's degree in Computer Science, Software Engineering, etc, or equivalent experience
• Fluency in Python and JavaScript, and their environments (venv, conda/mamba, pixi)

What we offer:

• Mission-driven climate-tech work with real-world adoption
• Ownership, autonomy, and the chance to shape how we build
• Competitive salary, comprehensive benefits, and a dynamic work environment
• Opportunities for professional growth within a globally recognized and respected organization
• Salary range: 40-130k EUR