FINTECH / SAAS
Headless Integration for Legacy Accounting Systems
Replaces ~4h/day of manual accountant work × ~20 working days.
How we turned a closed accounting platform into an automated workflow, removing repetitive manual work without waiting for an official API.
A US startup needed to integrate data from a well-known legacy accounting platform into their own product. No public APIs existed for the required workflows, and anti-bot systems made a standard integration impossible. The goal was a technical bridge that could automate operations without putting user accounts at risk.
Without a reliable integration, the product depended on manual back-office work. Standard automation could also trigger account instability or break whenever the platform changed.
Validate whether a headless integration could safely automate the critical workflow before investing in a full production bridge.
We structured the work in two phases: a 3-week PoC to confirm technical feasibility, then 2 months to production. We used SeleniumBase to handle authentication, building a session persistence layer that minimises logins and makes the automation look like organic traffic. To maximise efficiency, we reverse engineered the software's internal network calls, bypassing DOM interaction wherever possible. The whole architecture is Dockerised and stateless, allowing horizontal scaling of parallel sessions with granular log monitoring.
The startup no longer needed people to repeat the same accounting workflow by hand every day. The closed platform became an automated backend the product could use safely, saving roughly 80 hours per month and giving the client a system they own and can scale independently.
≈ +80 hours/month freed
Replaces ~4h/day of manual accountant work × ~20 working days.
BeforeManual accounting workflow
AfterAutomated backend workflow
BeforeNo official API
AfterModern internal endpoints
BeforeRoughly 4 hours per day spent manually
AfterAbout 80 hours per month freed