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/Contractor
Languages Required: English fluency
Experience: Senior 6-10 year experience, ideally large history of open-source contributions
Salary Range: 40-130kEUR
Reports to: Head of Software Engineering
Travel Requirements: Occasional travel to workshops or team events needed
Start 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:
*
o 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.