About Us

Founded in 2009, we are a software consultancy with a wealth of technical and commercial experience. We specialise in mobile, desktop, and web frontend and backend software. As leading experts in a wide range of software technologies, we can provide services from project inception to delivery. Our skills and resources also allow us to support and advise your team on specific projects. We are excellently placed to provide due diligence services when independent technical assessment is required.

Meet the Team

Jonathan Custance


“We strive to delight customers with the projects we develop and deliver for them. The level of repeat work and referrals shows we are achieving this goal.”

James Green


“There is no typical day, in the morning I can find myself advising a start-up on raising finance, and in the afternoon I can be architecting a cloud based e-commerce solution.”

James and Jonathan both studied Computer Science at the University of Cambridge. They began working together at the successful Cambridge start up Virata, before founding their first business Camrivox in 2005. After raising over £3M in venture capital they sold the business in 2009.

As an exciting step forward, and using a memorable fusion of their surnames, the pair went on to found Green Custard. The business has grown year-on-year with the successful combination of highly skilled engineers and a passion for exceeding customers' expectations.

Continuing to evolve the company, they purchased Cambridge-based software development agency Versio4 in 2016. This gave them the opportunity to double the team in size whilst still delivering customers’ projects in the manner they value - furthering Green Custard’s position as a leading software consultancy.

Gavin Dolling

Business Development Manager

Gavin has a strong background in software engineering and project management, with over 20 years of experience working in the industry, after graduating in Computer Science from the University of Cambridge. The combination of software engineering and project management skills makes Gavin excellently placed to understand our clients’ needs and challenges.

Martin Twiss

Head of Sales

Martin has 20 years technical sales and business development under his belt, having previously led sales teams at companies such as Zeus Technology, Sonos, and Computers Unlimited. Martin has worked with clients of all sizes across the public and private sectors; from start-ups through to large blue chip corporations. He has a keen eye for detail and significant project management experience, having chaired one of the UK’s largest voluntary arts organisations, coordinating the efforts of over 1,000 volunteers and performers.

Dr. Geoff Martin

Consultant Software Developer

Geoff has spent nearly 15 years developing web-based software. Originally graduating from the Electrical and Information Sciences Tripos at the University of Cambridge, he moved into web-based educational software for his PhD, also at Cambridge. His experience includes working on projects for small businesses and charities, through to Universities and Enterprises supporting thousands of employees.

William Alexander

Consultant Software Design and Development

William has a strong background in electronic and software engineering. His experience includes working on desktop-server through to mobile applications and from start-ups through to Enterprises. His focus recently is on design and implementation of mobile applications using latest UX design.

Bonnie Twiss

Financial Manager

Bonnie graduated from Imperial College London with BSc Hons in International Business. Following this, she spent six years working in management and commissioning within the public sector before setting up her own consulting business in 2008. More recently Bonnie became a Director and Financial Manager for Versio4 Ltd which merged with Green Custard in 2016.

Zoltan Molnar

Consultant Software Developer

Zoltan came from the startup world where he learned how to build highly scalable solutions in no time. He used a wide variety of AWS, Google and Azure’s products to solve Big Data problems in a fast moving environment. Using different DevOps techniques, he doubled his team’s performance so everybody could focus on building the product instead of managing the architecture.

Attila Varga

Consultant Software Developer

Attila has 5 years of experience in web development and has worked in different layers of the stack using various programming languages and technologies. Although he designed and implemented scalable, real-time and Big Data backends, he is passionate about the latest frontend technologies and able to implement pixel-perfect designs and UX.

Jemma Crane

Marketing Specialist

Jemma is a seasoned marketing professional with over 11 years of experience, a degree in management, and a CIM Diploma. Using her knowledge gained from multiple marketing and event roles in the software industry, she reaches out to both new and existing customers on behalf of the team.

That’s the team! We would be delighted to meet you in person, please get in touch to discuss your project further.


If you are an exceptional designer or developer then we'd love to hear from you. Please send us an e-mail with some more information about yourself to jobs@green-custard.com.

No agencies please.