Your team is too good to spend their days fixing Excel

De Havilands provides ongoing Excel development capacity for mid-tier financial services firms — so your people can focus on the work that actually matters.

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See What's Possible: 30+ Real Excel Projects for Financial Services Firms

From automated reporting packs to risk model rebuilds, this portfolio shows the kind of work we do and the results it delivers — including ROI gains of up to 631% and time savings of over 99%. 

Download it to see real examples from firms like yours.

Two ways to work with De Havilands

Whether you need ongoing Excel development capacity or a specific project delivered, we have a service designed for it.

Excel on Tap

Ongoing Excel development capacity — like having your own Excel team, without the hiring overhead.

  • Reserved access to senior Excel developers who understand your environment and priorities
  • Continuous automation and improvement of your spreadsheet processes — not reactive firefighting
  • Predictable monthly investment with no project scoping, no hourly billing, no surprises
  • Work is prioritised collaboratively — the highest-value improvements happen first
  • Led by a Microsoft Excel MVP with 25 years of financial services experience
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Bespoke Development

A specific Excel problem to solve? We scope it, quote it, and deliver it at a fixed price.

  • Tailor-made Excel solutions built to your exact requirements
  • Automate manual processes that currently take hours or days
  • Reduce operational risk with reliable, documented, maintainable solutions
  • Fixed-price delivery — you know the cost before we start
  • ROI of 631% and 99.8% time saving achieved for one London asset manager
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Why De Havilands exists

For 25 years, Marcus Syben has built Excel solutions for financial services firms — from investment banks and asset managers to FX dealers and private equity. He's seen firsthand what happens when Excel quietly becomes the operational backbone of a business: the manual hours that pile up every month, the models that only one person understands, the compliance questions nobody can comfortably answer.

De Havilands exists to fix that — not just for one project, but permanently. We become the Excel capability your team has always needed but never had the time or resource to build in-house.

Marcus holds Microsoft Excel MVP status — one of fewer than 200 holders of that credential worldwide.

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Insights for financial services teams who run on Excel

The Spreadsheet Key Person Risk

Why Are You (Still) Emailing Data for Excel?

Replacing VBA with Excel’s Dynamic Array Formulas

Checkboxes on UserForms

What our clients say

I didn’t appreciate how easy it was to work with Marcus until I had to work with other developers

Jamie C. ● Management Consultant

Very rarely can someone interpret ideas so well as Marcus has.

Frank F. ● Company Director

I wanted to thank you again for all your help and advice .. [it].. has really been a gamechanger.

Holly C ● Principal Consultant

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631% ROI. 48 days saved every year. One Excel automation project.

A London asset manager was spending four days every month producing a manual reporting process. We automated it. The project cost £1,600. The annual labour saving was over £10,000. That's a 631% return on investment — and the process now runs in minutes instead of days.

Download the case study to see exactly how we did it.

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