Software Engineer at TransitionZero

London, England, United Kingdom -

Full Time

Start Date

Immediate

Expiry Date

21 Sep, 26

Salary

70000.0

Posted On

23 Jun, 26

Experience

2 year(s) or above

Remote Job

Yes

Telecommute

Yes

Sponsor Visa

Skills

Python, RESTful APIs, SQL, PostgreSQL, BigQuery, Data Modelling, Git, Terraform, Docker, Google Cloud, Pandas, Polars, Pydantic, SQLAlchemy, Alembic, CI/CD

Industry

Services for Renewable Energy

Description

About Us About the Role We are looking for Software Engineers to help build the tooling behind Scenario Builder, our electricity grid modelling platform. Scenario Builder is an in-browser platform that currently provides capacity expansion and dispatch modelling through an accessible no-code interface. The vision for Scenario Builder is to expand into power flow modelling to create a fully integrated grid modelling platform with the features and functionality needed to enable users to develop bankable scenarios that support energy investment decisions. You will work closely with the wider product and engineering team to design, develop, and maintain software that power our platform, and lead on open sourcing efforts where appropriate. You will also be expected to mentor and guide more junior engineers on best practices and system design. This hybrid role is based out of our London office near Waterloo Station. Responsibilities Software development & architecture Design, develop, and maintain open source and internal services and libraries used by multiple teams across the business Contribute to reliability, performance, and security through best practices in code quality, testing, and monitoring Developing self-service software and data products to be used by internal and external stakeholders Working closely with software and modelling teams to automate tasks and make use of shared services DevOps Implement and maintain CI/CD pipelines to enable rapid, reliable deployments Implement and maintain infrastructure-as-code (Terraform) Collaboration & growth Participate in code reviews, architectural discussions, and technical planning sessions Collaborate with cross-functional teams, including product, back-end and data engineering, and modelling, to deliver impactful features Stay current with industry trends and best practices, bringing new ideas and technologies to the team Contribute to a culture of technical excellence and continuous improvement About You Skills & Experience Essential 3+ years of experience in software development, with strong proficiency in Python Experience working with RESTful APIs — building clients, integrating services, and understanding API design principles Understanding of SQL, database technologies (PostgreSQL, BigQuery), and data modelling principles Solid understanding of software engineering best practices, including testing, Git-based workflows, code review, and documentation Excellent problem-solving skills and ability to work independently on complex technical challenges Desirable Familiarity with data processing and data validation libraries (pandas, Polars, Pydantic) Familiarity with ORMs (SQLAlchemy) and database migration tools (Alembic) Experience developing and deploying cloud-native solutions using containers (Docker), ideally on Google Cloud Familiarity with infrastructure-as-code (Terraform) and GitOps practices Experience working with AI coding tools (Claude Code, Cursor) Experience with AGILE/Scrum based ways-of-working Experience in the energy sector Salary & Benefits Benefits Enhanced competitive pension scheme - auto-enrollment from day 1 25 days annual leave (excluding UK public holidays) and an additional discretionary days off such as over the festive period 20 days of annual allowance to work from anywhere in the world Hybrid working and core working hours model Allowance to set up your home office Annual budget and dedicated leave time for relevant training courses Enhanced gender-neutral parental leave (16 weeks fully paid) Private healthcare following the successful completion of the probation period Yearly team offsites Our Commitment to Diversity, Equity, & Inclusion Studies have shown that some people from marginalised or underrepresented groups are less likely to apply to a role unless they meet all of the hiring guidelines or qualifications. Whoever you are, even if you don't meet all of the criteria, if you can demonstrate a variety of skills and experience relevant to this role, we encourage you to apply as you might just be the candidate we hire! At TransitionZero, we're looking for people who are genuinely passionate about what they do, and we welcome all people, regardless of their background. If you would like to discuss any reasonable adjustments to the application or hiring process that may better facilitate your participation, please contact our People Team (people@transitionzero.org) for an informal chat. We will make every effort to respond to your request for assistance as soon as possible. Application Process About us TransitionZero is a climate tech non-profit founded in 2021. TransitionZero builds software to reduce the time to build clean energy at scale. We pioneer open-access and open-source tools that make electricity system modelling more transparent, accessible, and actionable for governments, financiers and grid operators worldwide. Our flagship tool, Scenario Builder, enables policymakers, planners and investors to rapidly build, analyse and share energy system and electricity grid models without coding expertise or external consultants. Supported by model-ready datasets, training and market insights, our tools strengthen in-house capacity and support resilient, affordable and locally-led energy transitions.

Responsibilities

Design, develop, and maintain open-source and internal services for the Scenario Builder electricity grid modelling platform. Implement CI/CD pipelines and infrastructure-as-code while mentoring junior engineers on system design.