About Us

Diffblue is a pioneering Generative AI for Code company with a mission to change the way software is written

Diffblue Cover

Diffblue Cover, the company’s first product, autonomously writes unit test code for Java applications to enable development teams to deliver higher quality software, faster. Unlike code suggestion tools, Cover does not need human review and can be integrated directly into CI/CD pipelines to automatically write and maintain full suites of unit tests. Diffblue customers include JP Morgan Chase, Citi, Goldman Sachs and Amazon Web Services.


Diffblue spun out of the AI research group at the University of Oxford and delivered its first software that writes software in 2020. Investors include IP Group, AlbionVC, Goldman Sachs, Oxford Science Enterprises, and Oxford University. Diffblue is headquartered in Oxford, UK.


Our culture is based on respect, accountability, collaboration and intellectual curiosity. We encourage an open and diverse environment that gives our people the autonomy and support to do their best work at Diffblue.

Leadership team

Our leadership team is passionate about making developers more productive and companies more successful using AI for Code.

Mathew Lodge

Chief Executive Officer

Mathew has over twenty-five years of experience in the software industry in developer, product and marketing roles. Before joining Diffblue, his titles included SVP at Anaconda and Vice President of Cloud Services at VMWare. In each role, his focus is on building and marketing products that customers love.

Daniel Kroening

Co-founder & Chief Scientist

Daniel is Chief Scientist and co-founder of Diffblue. He has 15 years experience building software verification tools and is the primary author of the CBMC verification framework. Daniel is also a Professor of Computer Science at University of Oxford.

Peter Schrammel

Co-founder & CTO

Peter is CTO and co-founder of Diffblue.  He has significant experience as a software project lead in the embedded systems industry and a strong track record in program analysis. Peter is also an Assistant Professor of Computer Science at the University of Sussex.

Jane Silber


Jane is Chair of Diffblue. She brings valuable executive experience in growing software companies that developers love. She was previously CEO of Canonical and is currently a non-executive director at Canonical and The Sensible Code Company.

Mike Mulford

Chief Finance Officer

Mike is CFO of Diffblue. Mike brings 20 years of financial experience in CFO/Finance Director roles ranging from venture capital backed start-ups through, private equity backed businesses to listed enterprises.

Swetha Sundaram

Head of HR

Swetha is the Head of HR at Diffblue. She comes with over 15 years of International HR experience across different industries and scaling startups. 
She is a commercially astute business partner, passionate about building winning teams and creating great employee experiences.

Andy Piper

VP of Engineering

Andy is the VP of Engineering at Diffblue. Previously the Head of Product Engineering at CBRE and the CTO of Push Technology Limited, Andy has more than 20 years of combined engineering and technology leadership experience. He holds a PhD in computer science from the University of Cambridge.

Matt Richards

Head of Product

Matthew is the Head of Product at Diffblue. Matthew joins us after 10 years at Cisco leading international engineering and product teams; prior to this he was a founder at Richberg Data Resiliency.

Peter Yabsley

Head of Marketing

Peter is Head of Marketing at Diffblue, bringing over 15 years of marketing experience to the role. Peter’s career began in engineering and has since spanned a variety of roles at companies including Canon, Intuit and Basis Technologies, a specialist in DevOps application delivery software.