Senior Software Engineer

Senior Software Engineer | React, TypeScript, Node, Python | Mission-Led Global Environmental Data Non-Profit

Salary: £70,000 to £80,000

Location: London, Hybrid. You will need to be within commuting distance, though in reality the team works largely remotely with the office used roughly once a quarter

This is a non-profit that sits at the centre of how the world measures its environmental impact. They run an independent system that thousands of companies, cities and regions use to disclose how they are managing climate, water and nature, and that data feeds the investment and lending decisions of institutions holding a serious slice of the world's assets. The engineering here has a direct line to that mission: the Scoring team builds and maintains the internal platform that turns disclosure data into the scores everything else hangs off.

The stack is React, TypeScript, Node and Python, running predominantly on Azure. The team has a genuine Python gap right now, so for the Senior seat in particular, real Python depth alongside the TypeScript is what moves the needle. Everything is internal tooling, nothing customer-facing, and because the data is sensitive the environment is properly regulated.

What They're Looking For:

Node.js, React and TypeScript

Python (genuine depth)

A track record across large, multi-product systems and the depth to mentor

What You'll Work With:

Microsoft Azure (the cloud the platform runs on; happy for you to pick it up if your background is AWS or GCP)

Agile and DevOps ways of working

A cross-functional squad spanning product, QA, design and infrastructure

Internal platform and tooling work, nothing customer-facing

Code review and technical documentation as part of the day-to-day

Nice to Haves:

LLMs or text-based machine learning, the team is starting to fold AI into how scoring works

Coming out of contract and looking to settle into a permanent team

Interest in climate, sustainability or environmental data

Why Join / Projects:

The pull here is twofold: the work matters and the team trusts you to get on with it. You would be building the systems that decide how some of the world's biggest companies are scored on their environmental impact, and the Lead runs the team on autonomy rather than oversight, nobody chasing anybody, people just shipping. The platform is text-heavy and they are starting to bring AI into the scoring methodology, so there is real scope to shape that if it is your thing.

Employee Benefits:

30 days' holiday plus bank holidays

Generous non-contributory pension

Life assurance

Employee Assistance Programme

Training and development

Flexible working

If either seat sounds like your kind of work, apply and I'll give you a call to talk it through.

Senior Software Engineer | React, TypeScript, Node, Python | Mission-Led Global Environmental Data Non-Profit