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Reno Toonen

Reno Toonen

Co-founder TopDevs · Engineering & security

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Reno co-founded TopDevs and leads engineering and security. He makes sure every build is fast, secure and rock-solid, from database and authentication design to deployment and monitoring.

Expertise

Software engineeringApplication securityDevOpsDatabases

Articles by Reno

An ERP system represented by connected stone modules with cyan joints on a mountain slope
Custom Software·10 min read

What is an ERP system? Meaning and examples

What is an ERP system and do you need one? Explore examples, ERP versus CRM, and when standard software or a custom extension makes sense.

What is an API, cyan roots connect a rocky hill and a grassy hill in an alpine landscape
Custom Software·7 min read

What is an API? A guide for software buyers

What is an API, and what can it do? Understand requests, access and the difference from an integration. Find out what to ask your supplier.

Power Apps versus custom software, alpine hills with a cyan forked path linking a platform symbol and building blocks
Custom Software·10 min read

Power Apps vs custom software: what fits?

Power Apps or custom software? Compare licensing, data limits, maintenance and users. Find out what to test before committing to a development project.

Comparing software developers, two mountain paths with a subtle cyan trail marker
Custom Software·10 min read

Dutch software developers: shortlist (2026)

Compare five Dutch software developers by approach, proposed team, scope and support. Use a transparent shortlist to assess your project options.

Software for municipalities, modular cyan blocks built like terraces into a mountainside around a larger existing base
Custom Software·7 min read

Software for municipalities: buy or build?

Explore the Dutch municipal software landscape, Common Ground, and the choice between standard packages, integrations and custom components.

Rebuilding software, a cyan terraced hillside of modular blocks rising from a mountain meadow, as an image of existing software rebuilt on a modern foundation
Custom Software·7 min read

Rebuilding software: when it pays off and how

Rebuilding software starts with deciding what to retain. Compare maintenance, rebuilding and packages, then plan costs, migration and handover.

Custom CRM, a cyan terraced hillside of modular blocks rising from a mountain meadow, as an image of a CRM assembled around your own sales process
Custom Software·10 min read

Custom CRM: When It Pays Off and When a Standard CRM Is Smarter

A custom CRM means two things: having a CRM built from scratch, or configuring a standard CRM like HubSpot or Salesforce to fit your process. This honest decision guide explains the difference, when custom pays off, what it costs and how to start. No sales pitch.

Software escrow explained, a cyan protective dome over a small terraced block structure in a green mountain valley as an image of source code kept safely in escrow
Custom Software·7 min read

Software escrow: terms, testing and continuity

What does software escrow cover? Understand release, verification, SaaS and costs, and decide which continuity arrangements your application needs.

Custom business software, a cyan terraced hillside of modular blocks rising from a mountain meadow, as an image of software assembled around a company's own processes
Custom Software·9 min read

Custom Business Software: When to Choose Custom Over Off-the-Shelf

Custom business software or an off-the-shelf package? An honest decision guide for SMEs: what custom means, when it pays off, which systems you build custom, what it costs and how to start. No sales pitch.

Building a quotation app, a terraced structure of modular cyan blocks rising from a mountain meadow, as an image for a custom quote app built block by block
Custom Software·11 min read

Building a quotation app: off-the-shelf software or custom? (2026)

Everything about building a quotation app: the difference between off-the-shelf quoting software and a custom quote app, when custom pays off, what it costs, which features matter and what to watch for. A practical decision guide for SMEs, without the sales pitch.

Construction software, modular cyan blocks built like terraces into a mountainside
Custom Software·7 min read

Construction software: package or custom build?

Construction software for estimating, planning and project records: compare packages, integrations and custom work. Find what fits your business.

Having a dashboard built, layered cyan data strata glowing as they rise from a mountain meadow, as an image of separate data sources coming together in one overview
Custom Software·10 min read

Having a Dashboard Built: Costs, Types and the Right Choice (2026)

Everything about having a dashboard built: the difference between a reporting dashboard (Power BI) and a custom application dashboard, what it costs, build it yourself or outsource, and what to watch out for. A practical choice guide for SMEs, without the sales pitch.

Having a portal built, a cyan gateway of light rising from a green mountain meadow, as an image of a secured online environment people log into
Custom Software·10 min read

Having a Portal Built: Types, Costs and Approach (2026)

What a portal is, which types exist (customer, employee, supplier and member portals), when it pays off, what it costs and how the build process works. A practical decision guide for SMEs, without the sales pitch.

Having a web application built, a cyan terraced hillside of modular blocks rising from a mountain meadow, as an image of custom software assembled step by step
Custom Software·11 min read

Web application development: the complete guide for SMBs (2026)

Web application development, or having one built? What a web application is, when you need one, how the project runs and how to pick the right partner. No sales pitch.

Web app development cost, a cyan terraced mountain slope rising toward a peak, symbolising cost rising with scope
Custom Software·9 min read

Web app development cost: price guide 2026

Web app development cost in 2026, broken down by type, by component and by year. Plus how a web application differs from a website and an app, and how to keep the bill down.

SaaS development cost, a cyan terraced mountain slope with rising tiers climbing toward a peak under a soft cyan sunrise
Custom Software·9 min read

SaaS development cost: price guide 2026

SaaS development cost in 2026, broken down by phase, by building block and by month of running costs. Plus how to start smart. Book a free intake call.

Having an app built, a cyan terraced mountain structure of modular blocks rising toward the peak
Custom Software·7 min read

App development: cost, types and process

App development costs depend on scope and platform. Compare native, cross-platform and web apps, then learn what to check in a quote.

Off-the-shelf versus custom software, two equal cyan mountain hills joined by a glowing cyan bridge
Custom Software·7 min read

AFAS vs custom software: which approach fits?

AFAS or custom software? Assess configuration, integrations and maintenance using your own process. Compare costs without assuming a break-even year.

Two TopDevs colleagues reviewing a design together
Custom Software·8 min read

Custom software for SMBs: a practical guide

Considering custom software? Learn how to agree scope, budget, delivery and maintenance, and decide whether a custom build fits your business.

MVP development approach and phases for SMBs
Custom Software·9 min read

Having an MVP built for SMBs: approach, phases and costs (2026)

Practical guide for SMB founders. What is an MVP, when do you pick this route, what does it cost, which phases do you go through and which features belong in a first version.

Custom software costs in 2026 for SMBs, honest price guide
Custom Software·7 min read

Custom software costs: budgeting for SMBs

What affects custom software costs? Compare development, maintenance and changes, and build a budget around the scope of your project.

Headless CMS comparison Strapi Payload Sanity for SMBs
Custom Software·5 min read

Strapi vs Payload vs Sanity: which CMS fits?

Compare Strapi, Payload, Sanity and Storyblok for editing, hosting and maintenance. See what the end of Strapi 4 support means for your choice.

Web app, SaaS or custom platform choice for SMBs
Custom Software·8 min read

Web app, SaaS or custom: which route fits?

Web app, SaaS or custom software? Understand the difference and compare an existing product, an addition and custom development on tasks, upkeep and cost.

Airtable Notion versus custom platform comparison for SMBs
Custom Software·5 min read

Airtable vs Notion vs custom: what fits?

Compare Airtable, Notion and a custom platform for workflows, maintenance and limits. Find out what to test before deciding to switch.

Software agency versus freelance developer choice for SMBs
Custom Software·11 min read

Software agency vs freelance developer: what fits your SMB project? (2026)

When do you pick a freelance developer and when a software agency for your SMB project? Honest comparison on cost, risk, capacity and ownership.

Code ownership and vendor lock-in explained for SMBs
Custom Software·7 min read

Code ownership: how to avoid vendor lock-in

What does code ownership mean for your software? Check the rights, access and documentation you need to be able to change suppliers later.

Client portal examples for SMBs
Custom Software·7 min read

Client portals: examples, costs and approach

A client portal gives customers access to documents and case updates. Explore examples, costs, security and the steps towards a useful portal.

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