You want to build a new product or improve a business process. We turn your requirements into working Glossary · In briefcustom softwareCustom software is software developed for the specific needs of an organization or product. Its features and processes are tailored to the intended use.Read more: a customer portal, internal tool, calculation module or integrations between systems. We consider scalability, security and years of further development.
Work directly with the developers building your software
Agree on scope, budget and guarantees before development
Copyright in the custom code we build belongs to you
Outsourcing software development
Commissioning software starts with what users need to do. Which manual tasks should it replace, which data needs to come together and where does standard software fall short? We also consider whether existing software already meets your needs.
If custom software fits, we agree on what the first version needs to do. We define screens, user roles, calculations and integrations and estimate the work for each part. We explain technical choices in terms of reliability, security, costs and maintainability.
You outsource development to our team. You remain responsible for priorities and make someone available who understands the process and users. That person reviews working versions and makes decisions. Our developers handle implementation, code review, tests, planning and technical coordination.
For a new build, our starting point is generally around €25,000 or more. This is not a fixed package: features and dependencies determine the scope. Looking primarily for pricing information? See our custom software costs.
Discuss your project
Fintech · Getsby
For Getsby, we built an app that lets users buy, top up and manage virtual payment cards. Several financial providers work behind that app. Every movement of money needs to be traceable, including when a payment doesn't go as expected.
We made transactions traceable and structured the integrations so financial providers could be replaced. When a payment route proved insufficiently reliable in practice, we could replace it without rebuilding card management.
Early engineering decisions determine how much freedom you have later. Tests and monitoring help us keep checking that foundation as the product evolves.
Explore the engineering decisions behind Getsby
Manufacturing · Zetprofiel
For Zetprofiel, we built an order portal where customers and staff can draw steel profiles and calculate their properties. The software calculates materials, weight and price, then generates a work order for production. It replaces manual redrawing and gathering data from separate sources.
One engineering challenge was the geometry: how do you display dimensions and angles on complex shapes without labels overlapping? And how do you keep the drawing legible on a printed work order?
We separated the calculations from the controls and rendering. That let us add bend corrections later without rebuilding the drawing tool. Together with Zetprofiel, we use real profiles to keep improving the software.
Explore Zetprofiel's order portal
Esther Radder
Product manager for Werkplanner at SGI Compliance Nederland
Antoon Scheffers
IVBB
Toon Van Dooren
Lead innovation engineer at Savvii Managed Hosting
Viktor Mirovic
Owner of TasteIndex
A company of developers
Apart from Bas in sales and Linda in operations, everyone at 10KB is a developer. We don't employ project managers, designers or marketers. Software development is our craft, and our company is built around it.
You explain your requirements to the people writing the code. We make the technical choices understandable: what are the options, and what does each mean for reliability, security, costs and maintenance? You don't need to be a programmer to take part in those decisions.
Together, we choose what best fits your challenge. We keep considering those trade-offs throughout development, as usage grows, requirements change or a simpler solution becomes possible. Coordination, planning and explanation are part of our developers' work.
How direct contact with developers works
Ewout Kleinsmann and Roland Boon
Ewout and Roland were already programming together as students. That led to the founding of 10KB in 2013. They still do what brought them together: build software.
They contribute to all our projects every day. Their working day revolves around code: programming, reviewing colleagues' work and making technical decisions. When you discuss your software with them, you're talking to people who help build the solution themselves.
Ewout guides projects from the first outline through to delivery, keeping an eye on how the parts work together. Roland sets the technical direction and focuses on code quality, security and maintainability. You'll find them working alongside the other developers.
Meet the whole team
Agreements before the first line of code
Where a cost guarantee is agreed, the pessimistic estimate in the proposal sets the maximum for unchanged functionality and assumptions. If the work takes less time, you pay for the hours actually worked. We estimate new requirements separately.
We fix faults arising from our original development at no extra charge within the agreed scope and warranty period. The proposal specifies that period. We also agree on aftercare in advance: how to report problems and who handles them.
We address delivery findings from an agreed independent security audit at no extra charge within the agreed audit and project scope. The guarantee covers fixes to the delivered solution. New security requirements outside those agreements aren't included.
A maximum for an unchanged scope
Where a cost guarantee is agreed, the pessimistic estimate in the proposal sets the maximum for unchanged functionality and assumptions. If the work takes less time, you pay for the hours actually worked. We estimate new requirements separately.
Your investment, your software
We always transfer copyright in the custom code we develop for you. You can develop the software further, build an internal team or continue with another supplier.
We make that practical too, with access to the source code, documentation and necessary accounts. Wherever possible, hosting and external services are registered in your name. Third-party libraries and services remain subject to their own licences and terms.
You stay with us because the collaboration works. Your software doesn't tie you to us.
Our intellectual property agreements
From business problem to delivery
You don't need a detailed technical plan. We discuss who will use the software, what they need to do and who can make decisions on your side.
01
We identify the required functionality, data and integrations. Together, we agree on availability, performance and security requirements. We take proven software seriously: if continuing development makes more sense than a rebuild, we discuss that.
02
We estimate individual parts with their assumptions and risks. You choose what the first version must include and what can wait. We document scope, ownership arrangements and any guarantees in advance.
03
You receive working versions and give feedback directly to the developers. Tests, code review and deliberate technology choices help keep the software maintainable. Together, we track progress and budget, prepare for launch and agree on maintenance and further development.
Our strength is software engineering. It is particularly valuable when the technology determines what your business can do and how reliably you serve your customers.
Unsure which route fits? We're happy to discuss whether our engineering expertise would add value to your project.
No. Tell us which process or product you want to improve, who the users are and which systems are involved. We discuss the stack, architecture and development approach that fit and explain the choices.
You set priorities and provide access to the people and systems needed to understand the required functionality. We need someone who can make decisions and has time to review working versions. We account for that availability in the schedule.
Further development often makes sense when the existing foundation is stable and technically healthy. We assess architecture, tests, maintainability and the risks of changes. Outdated or unstable software may call for redevelopment; we consider that before you invest in a new build.
A new build generally starts at around €25,000, depending on features, integrations and migration. You receive an estimate for each part with explicit assumptions. See our custom software costs for the distinction between development and recurring costs.
That depends on the first usable version, external dependencies and any data migration. We agree on sequence and schedule together, allowing for your time to make decisions and give feedback. We don't promise a delivery date before the scope is clear.
Our developers work on screens and usability too, drawing on real workflows and user feedback. If specialist design or research is needed, we discuss how to arrange and budget for it in advance.
We agree on how to report problems and what the software warranty covers. Hosting, security updates, maintenance and further development have their own arrangements. See our approach to maintenance and support.
Ewout
Tell us which problem you want to solve, who will use the software and which systems are involved. You do not need a technical plan. We discuss scope, collaboration and next steps. Call +31 24 669 05 18 or email Ewout directly.
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