We built a founder's spreadsheet into a
product its owner can trust
How OneSyntax helped Leave Dates evolve a straightforward staff holiday planner into a dependable product used across web and mobile.
Leave Dates
Capterra
Best Ease
of Use
2026
“OneSyntax has been more than a development team - they’ve become a trusted part of how we evolve the product. They understand what our customers value, communicate clearly, and help us add new capabilities without losing the simplicity that makes Leave Dates work. The continuity and care they bring to the partnership have made a real difference.”
Phil Norton
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8 years
The same team since the first commit, still going
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~4,500
Automated tests, run on every change before a release
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1,000+
Acceptance scenarios in plain English, and readable by the business
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9
Major framework upgrades on one codebase, never rewritten
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3
Clients, built by three teams, on one set of use cases
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250+
Public customer reviews
Challenge
Leave planning should not feel like another job.
Growing teams need a clear view of who is available without chasing emails or maintaining fragile spreadsheets.
The product had to keep a simple experience while supporting more rules, teams, integrations, and everyday edge cases.
A product built to keep evolving
OneSyntax helped Leave Dates grow its staff holiday planner without losing the simplicity customers valued. Working as a long-term product and engineering partner, the team supported new features, connected experiences, and the technical foundation needed for continued growth.
- 2018
- Web + Mobile
- Ongoing
Hear from the team
Shared team wall chart
A live calendar gives employees and managers one clear view of upcoming leave, pending requests, and potential overlaps - making it easier to plan without relying on spreadsheets or email updates.
Leave requests and approvals
Employees can check their remaining allowance and submit time-off requests from web or mobile. Managers receive the information they need to approve or decline requests without interrupting their workflow.
Built to grow without losing its simplicity
OneSyntax helped Leave Dates evolve its product while keeping everyday leave planning clear and easy.
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Simplify everyday tasks
Clear workflows help employees request time off, check allowances, and understand their leave without relying on spreadsheets or lengthy processes.
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Give teams one shared view
Managers can review requests, identify potential clashes, and understand team availability from a shared product experience across web and mobile.
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Keep the product moving
A long-term engineering relationship gives Leave Dates continuity as requirements change, integrations expand, and new product opportunities emerge.
Hear from the client
Hear from the team
Ruchinara Samaranayake
Product experience and delivery
Helped improve the core leave-planning experience, keeping requests, approvals, and team availability simple as the product evolved.
Sadeepa Irushan
Engineering and product development
Worked on the technical foundation and new product capabilities needed to support Leave Dates across its continued growth.
See the whole team at a glance
The shared wall chart brings upcoming leave, pending requests, and team availability into one clear view. Managers can spot potential clashes early, while employees can plan time off with greater confidence.
- View approved and pending leave together
- Track holidays, sickness, and custom leave types
- Identify overlaps before approving a request
Request and approve leave in moments
Employees can check their remaining allowance and request time off through a straightforward booking flow. Managers receive the relevant dates and leave details, allowing them to review each request without unnecessary back-and-forth.
Results
A simpler product, a stronger foundation, and room to keep growing
Employees can check their remaining allowance and request time off through a straightforward booking flow. Managers receive the relevant dates and leave details, allowing them to review each request without unnecessary back-and-forth.
- View approved and pending leave together
- Track holidays, sickness, and custom leave types
- Identify overlaps before approving a request
The partnership continues beyond individual releases. As Leave Dates grows, OneSyntax can support the next stage of the product - improving existing workflows, introducing new capabilities, and keeping the experience dependable as customer needs change.
