HR Leave & Expenses Self-Service Portal Build in Dublin (2026)

The verdict in three sentences

A custom HR portal makes sense when an off-the-shelf HRIS is too rigid, too expensive at scale, or poorly integrated with your payroll. In 2026, budget 30,000 to 60,000 EUR (about 45,000-90,000 USD) and 3 to 5 months for a self-service portal covering leave + expenses + documents, with an approval workflow and a payroll connector. The immediate gain: up to 30 hours/month freed in HR and the end of manual re-entry into payroll.

Custom or off-the-shelf HRIS: how to decide

A SaaS HRIS (billed per user/month) wins on simplicity but is costly at scale and adapts poorly to specifics. Custom has a fixed entry cost but no per-head subscription.

From 250-300 employees and with specific leave rules (time-banking, seniority, comp days), custom often becomes more cost-effective over 3 years, on top of being fully GDPR-compliant on your own servers.

The modules that save time

The portal targets low-value but time-consuming HR tasks. Here is the breakdown of typical gains seen in 2026.

Mini case study

Marc is HR director of a 320-employee industrial mid-market firm in Dublin. His HR team (4 people) spends about 32 hours/month handling leave and expenses by email and spreadsheet, plus re-entry into the payroll software. He invests 46,000 EUR in a custom portal integrated with payroll.

After rollout, processing drops to ~4 hours/month of oversight, i.e. 28 hours/month freed. Valued at 35 EUR/h loaded, that is ~980 EUR/month, or 11,800 EUR/year. Add the elimination of re-entry errors (payroll corrections) and faster expense reimbursements, which lifts internal satisfaction. The investment pays back in about 3.5 years on HR time alone, far faster once you count avoiding a 10 EUR/employee/month HRIS subscription (38,400 EUR/year for 320 staff).

FAQ

Does the portal connect to our payroll software (Sage, ADP, BrightPay)? Yes, via a custom connector. Payroll variables (leave taken, approved expenses) are exported automatically, removing re-entry and errors. The connector budget is included in the project.

Is it GDPR-compliant? Yes. Data can be hosted in the EU, with role-based access, encryption and a retention policy. Custom leaves you full control of data location and retention duration.

Can employees use it on mobile? Yes, the portal is responsive or deliverable as an installable PWA. An employee photographs their expense receipt, OCR reads the amount, and the request goes to approval instantly from their phone.

How long to deploy? 3 to 5 months depending on the number of modules and the complexity of leave rules. A first batch (leave + balances) can ship in 10-12 weeks, with expenses following in a second phase.

Can it handle multiple collective agreements? Yes, that is precisely the value of custom. The rules engine models your company agreements, comp days, time-banking and seniority-specific rules, where a standard HRIS imposes its own limits.

Let's scope your project. Share your headcount, your payroll software and your specific leave rules; we'll frame a portal between 30,000 and 60,000 EUR with the right connector. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.