Let's get sustainable together

We’re developing a new way to be sustainable and we want you to be part of it. Sign up for early access and updates.

Our why

Everyone’s talking about sustainability. We all want to do better, we’re just not sure how to get there or where to start.

That’s why we created Zellar.


We want to leave the planet in a better state than we found it. And that means making sustainability simple.

We’ve got big plans, but we can’t do them without you. We need you on the journey with us to help shape our future.

The journey


your profile


Join the




your score


your profile


Join the




your score

The future

"With climate change the biggest issue of our generation, everyone, everywhere needs to become more sustainable. We’ve created Zellar to help make that happen before it’s too late."

Gary Styles

Founder of Zellar

we thrive

Whether you’re an individual, a homeowner, a business or an organisation, we’ll work with you to build your path to sustainability.

businesses measured

Sign up for early access and updates.

Let's talk

Want to find out more about sustainability and how we can work together? Email us and one of the Zellar family will be in touch.
© Zellar LTD 2020 | By using our site, you are accepting our terms of use.
Zellar LTD is registered in England & Wales | Company number: 10193629

© Zellar LTD 2020 | By using our site, you are accepting our terms of use.

Zellar LTD is registered in England & Wales | Company number: 10193629

Let's get sustainable together.

Enter your email to get early access and the latest updates from Zellar.

Contact us

2x Full stack developers (Remote working)

We all need to protect the planet

The UK has a target to get to net zero by 2050. We think that 30 years is too long to wait. That’s why we created Zellar. 

We’re a team of like-minded individuals on a mission to build disruptive technology to connect the data and insights that will help businesses on their sustainability journey to be net zero. And we need you.

Purpose of the role

We’re looking for two C# ASP.NET Core / React Full Stack Developers to join our growing development team,
and transform beautiful designs into a functioning web presence by designing and developing ASP.NET Core WebApi’s to enable functionality.

Responsibilities will include:

Implementing visual elements and their behaviours with user interactions. You will also be able to design, develop and test webapi to integrate with your ReactJS SPA.  

Bridging the gap between the visual elements and the server-side infrastructure, taking an active role on both sides, and defining how the application looks and function.

Key responsibilities

  • Help build reusable components and libraries for future use.
  • Create ASP.NET Core WebApis
  • Ensure the technical feasibility of UI/UX designs.
  • Assure that all user input is validated before submitting to back-end services.
  • Collaborate with other team members.

Essential requirements

  • Be a great friendly team player, experienced in working within an agile team.
  • Thrives on a fast-paced environment.
  • Can-do attitude.
  • Excellent understanding of JavaScript libraries, ReactJS.
  • Strong understanding of C#/JavaScript/Typescript and consuming Web API’s.
  • Familiarity with the ASP.NET Core framework, Sql Server/NoSql and modern design/architectural patterns.
  • Familiarity with Cloud computing.
  • Exposure to CI/CD.
  • Advocate of writing unit tests.
  • Commercial experience of Cloud computing / architecture E.g. AWS/Azure, etc.
  • Exposure to container experience. E.g. Docker.
  • Experience of developing RESTful API’s.
  • Experience of integrating with third-party APIs (including payment provider APIs).
  • Good understanding of HTML5 and CSS3.
  • Good understanding of asynchronous request handling, partial page updates.
  • Good understanding and experience of implementing client-side validation.
  • Proficient understanding of cross-browser compatibility issues with a strong understanding / experience of techniques to overcoming such issues.
  • Familiarity with front-end build tools, such as Webpack.
  • Good understanding of browser rendering behaviour and performance.
  • An understanding of Agile methodologies.
  • Good knowledge of coding and design principles.
  • A good understanding of best practices.
This is a fantastic opportunity for a passionate Full stack Developer professional looking to take on some significant challenges and help accelerate our business and transform an industry. 

If you’re passionate about software development and are looking for an opportunity to work with seasoned leaders in an ambitious, market-defining organisation, then this opportunity is for you. You’ll experience radical levels of ownership and empowerment within your role – plus the opportunity to see the direct impact of your work on our customers.


Zellar is headquartered in London, however the team are currently 100% remote working.

How to apply

To apply for the role, please send your CV to keisha@zellar.com. Keisha can also advise on more details about the role, including salary banding.

Thank you for your interest in Zellar.