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Our Manifesto

Turning complexity into clarity, together.
We help ambitious organisations modernise their systems, connect their data, and move forward with clarity and confidence.
We’re not here to sell technology.
We’re here to remove the friction that holds good businesses back.
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Problem

We see it every day. Data is everywhere, but insight is hard to find. Teams are stuck reacting instead of creating.
Leaders are forced to make critical decisions without clear, timely visibility. Teams are stuck reacting instead of creating.

Vision

A future where organisations thrive through technology, automation, and AI.
Where systems empower rather than constrain, and teams are free to focus on meaningful, high-impact work.

Mission

Too many great organisations are held back by the very systems designed to help them.
Our mission is to simplify complexity, support teams, and spark sustainable growth across the organisation.

Who We Are

From Energy Roots to Cloud Innovation Leaders

D55’s journey began in 2016, when our co-founders worked together on complex B2B billing challenges in the energy industry. With the right blend of technical expertise, a growth mindset, and a collaborative approach, they built a reputation for delivering results.
In 2018, D55 was officially founded, achieving AWS Partner status by 2019 and growing into a team of Cloud Architects, DevOps Engineers, Analysts, and Testers. While we built deep expertise in B2B energy, tackling everything from intricate industrial pricing engines to large-scale systems integration, we soon discovered these challenges were common across many industries.
In 2024, AWS recognised this expertise by awarding us the Energy Competency. Our name, “D55,” originates from the UK energy data bundle exchanged during supplier switches, a nod to our heritage and to helping organisations switch to something smarter, better, and future-ready.
Today, we are an exceptional team of experts, offering a rare combination of deep technical expertise and commercial insight. Blended with your team, this becomes a powerful and compelling formula.

Who We Are

From Energy Roots to Cloud Innovation Leaders

2016

The foundations of D55 were formed as the founders collaborated on complex B2B billing and data challenges in the UK energy sector.

2018

D55 was officially founded to help organisations modernise platforms and unlock commercial value through technology.

2019

D55 became an official Amazon Web Services Partner, formalising its focus on AWS-led cloud transformation.

2022

D55 was crowned AWS GameDay World Champion, recognising elite real-world cloud engineering and problem-solving capability.

2023

D55 achieved AWS Advanced Tier Partner status, reflecting a strong track record of successful customer delivery at scale.

2024

AWS awarded D55 the Energy & Utilities Competency, validating deep sector expertise and proven outcomes in the energy market.

2025

D55 became an official AWS Migration Acceleration Program (MAP) Partner, enabling funded, lower-risk cloud migrations for clients.

2025

D55 surpassed 50+ AWS certifications, reinforcing the depth and breadth of its cloud, data, and modernisation expertise.

How we think

We’re driven by three simple beliefs:
Clarity creates momentum
When people understand what’s really going on, everything moves faster.
Progress beats perfection
We take safe, confident steps forward, not risky leaps.
Partnership beats dependency
We leave teams stronger, not reliant.
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Trusted. Energised. Ready to act.

How we work

We start with understanding, before action. We diagnose before we prescribe. We explore before we build. We co-create before we deliver.  It’s how we make complexity feel manageable and momentum feel safe.
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Meet Our Directors

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Jonathan Rothwell
Founder & CEO
Jonathan Rothwell is the Founder & CEO of D55, with over 23 years’ experience as a Managing Director and IT Director, building and scaling digital businesses globally. He founded D55 in 2018 to help organisations turn complex technology change into clear commercial outcomes.
A serial entrepreneur and transformation leader, Jonathan specialises in large-scale digital transformation and lean MVP delivery, using cloud and software to unlock new revenue, improve efficiency, and modernise core systems.
He leads D55 with a relationship-first mindset, grounded in clarity, trust, and long-term partnership — values that continue to shape how D55 helps organisations modernise, innovate, and grow.
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Rhys Jacob
Co-Founder & CTO
Rhys Jacob is Co-Founder & CTO of D55, with over 20 years’ experience designing and delivering complex digital platforms. With a background in distributed systems, he has led products from early concept through to scalable, enterprise-grade applications.
Passionate about architecting solutions that deliver real-world results, Rhys combines deep engineering expertise with pragmatic delivery. At D55, he ensures cloud and application modernisation programmes are secure, scalable, and built for long-term value.

Why Partner With D55?

Your Partner for Security, Agility, and Results

Technology Expertise
AWS-certified engineers & advanced DevOps practices.
Transparency
Clear, collaborative, and issue-first communication.
Agility
High-performing teams delivering fast, valuable outcomes.
Industry Knowledge
From energy to SaaS to financial services, we adapt to your business.
Start your journey

OUR PARTNERS

Move further, faster.

We're advanced AWS Partners who manage the entire lifecycle. From strategy through build to optimisation. No handoffs. No gaps.

Application Development

Modernise legacy platforms so your teams can ship faster and innovate without friction.
WHAT WE DELIVER
  • Team augmentation or full project builds
  • DevOps, CloudOps, SecOps
  • Automated testing pipelines
  • AI-assisted development
  • Collaborative, embedded approach
OUTCOMES
  • Faster feature delivery
  • Reduced legacy risk
  • Reliable, scalable platforms

Data Services

Build modern data platforms that unlock real-time insight and lay the foundation for AI.
WHAT WE DELIVER
  • Data platform architecture
  • Pipeline engineering
  • Machine learning integration
  • AI and GenAI enablement
OUTCOMES
  • Single source of truth
  • Faster, clearer decisions
  • Automated reporting with improved accuracy

Managed Services

Keep everything running smoothly with governance, cost control, and continuous improvement built in.
WHAT WE DELIVER
  • Application Performance Management
  • Security and compliance
  • Landing zone setup
  • Billing and cost optimisation
OUTCOMES
  • Predictable cloud costs
  • Fewer incidents, less firefighting
  • Secure, well-architected environments

Sharper insights. 
Faster decisions. New ways to compete.

“While we led the initial business scoping and discussions with key stakeholders, it was a very smooth process working the D55 team to expand on this vision. The D55 team took ownership of building the solution and worked closely with us throughout the process. The quality of the work, combined with the excellent support during the handover, is exactly what we value in a partner.”

Andrew Thomas
CTO
Amber

"D55 enabled us to migrate from on-premise to a cloud-based solution, resulting in monthly cost savings of about 40%. Cloud-based systems give us a high level of resiliency and an unlimited capacity to scale. We’ve really put in place the foundations for later phases of work and further cost reduction as we scale. It was a partnership as opposed to a service - we work well together. "

Roger Worsley
CTO
kooomo

"Excellent technical knowledge, productive and responsive. Will go the extra mile to ensure customer satisfaction."

Chris Trigg
Co-Founder, Managing Director
ongen

"D55 are a highly experienced team that helped lead our business to push for and deliver an innovative and ambitious legacy to AWS transformation, with confidence. D55 have become a valued development and consultancy partner thanks to their excellent practical capability and their ability to apply the most appropriate working methodology to the challenge at hand."

Ed Berry
Head of Digital Products
switch2

"D55 have helped to develop our CRM system and have been a valued partner in this process. We continue to work with D55 on our application development and would have no hesitation to recommend them."

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Andrew Bright
Director
itp-energised

"D55 have proved to be an excellent development partner offering expertise and predictable delivery, with flexibility to respond to changing business needs. They have helped us explore new AWS technologies, challenged our thinking and sped up our adoption of relevant platform services."

Arran Stevenson
Director of Architecture
ensek

“D55 has been transformative for our business. They understood the business and our challenges and built a system that supports how we work now, as well as leveraging new technologies which are more cost-effective and increase our speed to deliver. Thanks to D55 we don’t have to worry about the day-to-day, so we can focus on the exceptional issues facing our industry."

D55 Client
CTO
energy

Let's explore the possible together

If your systems aren’t keeping pace with your ambition, if your data isn’t giving you the clarity and insights you need, or if you sense there’s more possible than your current platforms allow.
We’d love to explore that with you. No jargon. No pressure. No pitch. Just a proper conversation about what’s slowing you down and what could move you forward.
Book a discovery session