The verdict in three sentences
An agency placing 350 construction workers a week loses assignments every time it cannot tell, within 10 minutes, who holds a valid VCA certificate, a crane or forklift licence or an NEN 3140 electrical qualification. Standard staffing software handles payroll and contracts well, but not fine grained certificate tracking with expiry dates or skills based matching. A dedicated custom module connected to the existing system fills those lost assignments and protects the agency's liability.
The hidden cost of poorly tracked certificates
The managing director runs a pool of 1,200 active workers: bricklayers, formwork carpenters, plant operators, electricians, pipe layers, labourers. Clients are major contractors and civil engineering firms across Amsterdam, Haarlem and Almere. Certificates sit as scans in folders and expiry dates in a hand maintained spreadsheet.
| Certificate or obligation | Validity | Workers concerned | Risk if expired |
|---|---|---|---|
| VCA Basis or VOL | 10 years | 1,100 | No site access at most contractors |
| TCVT crane and plant certificates | 5 years | 240 | Site refusal, liability in an accident |
| Forklift and aerial platform certificates | typically 5 years | 180 | Same, agency held responsible |
| NEN 3140 electrical qualification | refresher every 3 years | 140 | Not allowed to work on installations |
| Medical examination for high risk roles (PAGO) | 2 to 4 years by role | 400 | Breach of duty of care |
| Working at height, asbestos (DTA, DAV) | 1 to 5 years | 150 | Site shutdown |
In a typical week the agency receives 410 requests and fills 350. About 25 of the 60 refusals relate to a certificate that could not be found or had expired, often while a qualified worker existed in the pool.
Standard software, custom build or add-on
Dutch staffing platforms cover payroll under the ABU or NBBU collective agreements, contracts, the phase system and invoicing. They typically cost 60 to 200 EUR per user per month or a fee per placement. Certificate tracking is often a simple field without fine alerts or matching.
| Option | Indicative cost | Timeline | What you get | Limit |
|---|---|---|---|---|
| Standard staffing software | 60 to 200 EUR per user per month (2026 order of magnitude) | 1 to 3 months | Payroll, contracts, invoicing | Certificates barely used |
| Third party skills module | 3,000 to 10,000 EUR per year | 1 to 2 months | Document vault | Limited matching, double entry |
| Kolonell custom, simple application | 2,500,000 to 4,000,000 FCFA (3,810 to 6,100 EUR) | 2 months | Certificate register with expiry alerts | No matching |
| Kolonell custom, medium application | 4,000,000 to 7,000,000 FCFA (6,100 to 10,670 EUR) | 3 to 4 months | Certificates, medicals, matching, worker app | Depends on vendor API |
| Kolonell custom, complex application | 7,000,000 to 15,000,000+ FCFA (10,670 to 22,870+ EUR) | 5 to 6 months | Full scope, client portal, e-signature, dashboards | Structuring project |
| Kolonell maintenance | 35,000 / 75,000 / 120,000 FCFA per month (53 / 114 / 183 EUR) | ongoing | Fixes, updates, new certificate types | Tier by usage |
Hosting, qualified e-signature and payroll connectors are priced in the quote.
The functions that fill assignments
Certificate register. Every VCA, TCVT, NEN 3140, training record and medical is stored with type, issue date and expiry date. The scan is attached, and workers can upload a photo from their phone. VCA certificates can be checked against the central diploma register.
Expiry alerts. At 90, 60 and 30 days the agency gets a list of renewals and the worker receives a text. Refresher courses can be booked, often funded through the sector training fund.
Skills matching. The recruiter enters the client request (role, machines, certificates, area, dates). The software ranks available workers holding every certificate valid on the assignment date, with travel distance to site.
Online contracts. The assignment contract is generated in the staffing system, sent for e-signature and archived, together with the WAADI registration and the client's chain liability documents.
Medical checks. Only fitness status and date are stored, and a placement is blocked automatically when fitness has lapsed.
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Mini case study
Sanne, managing director of a construction staffing agency in Amsterdam, chooses a medium application: certificate register, alerts, matching and worker app.
- Assignments recovered: 20 of the 25 weekly certificate related refusals.
- Average assignment: 1 week of 38 hours at an average billed rate of 42 EUR an hour.
- Extra revenue: 20 x 38 x 42 = 31,920 EUR a week, about 1,500,000 EUR over 47 weeks.
- At a 12 % gross margin after wages and charges, the gain is around 180,000 EUR a year.
- Admin time saved on certificate follow up: 12 hours a week across 2 recruiters.
With a budget between 6,100 and 10,670 EUR and 114 EUR of monthly maintenance, the investment is covered within a month, even if only half the expected assignments are recovered.
FAQ
Do we need to replace our staffing software?
No. It stays the reference for payroll and invoicing. The module reads workers and assignments and sends placements back via API or scheduled export.
Which medical data can we store?
Only fit or unfit status and the date, never medical content. That follows the GDPR and Dutch guidance from the Autoriteit Persoonsgegevens.
Will automatic blocking cost us assignments?
The opposite: 90 day alerts leave time to renew. A client will refuse an operator with an expired certificate on site anyway.
How long until go live?
Plan 3 to 4 months for the medium application. Loading existing certificates, roughly 3,000 documents, happens in month 2.
What does maintenance cost?
35,000, 75,000 or 120,000 FCFA per month (53, 114 or 183 EUR). Adding a new certificate type is included in the middle and top tiers.
Let's scope your project. We start from your worker pool, your most requested certificates and your staffing software to define a register and matching delivered within a few months. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.

