// cv.sergiuscraft.com
Full-stack developer specialising in finance integrations, EDI pipelines, and backend automation. Python, Perl, PHP, vanilla JS. Code that ships clean and runs quietly.
// expertise
Production experience with EDICOM, OIOUBL, SAF-T, Sendys, Svefaktura, UBL 2.1 and others. Built parsers, validators, and delivery pipelines for EU e-invoicing mandates across multiple countries.
Designed and built end-to-end dunning email systems — escalation logic, template engines, scheduling, and audit trails. Finance-domain thinking baked in from day one.
High-throughput pipelines, cron-driven processors, SFTP/OAuth integrations — the unglamorous infrastructure that keeps financial systems of one of the world's largest Travel & Transportation companies running at scale.
Full-stack Python/Rest API. No framework religion — just clean, maintainable code that renders fast and doesn't require a build system to change a button label.
MSc in Enterprise Financial Controlling + years in financial services. I understand the business logic behind the code — AR, AP, audit trails, reporting, and compliance aren't just requirements, they're context.
Linux-first developer. Arch Linux / Open Suse + MacOS daily. Git, SVN, custom deploy scripts, monitoring hooks. Comfortable owning the full stack from OS up — not just handing off to someone else's pipeline.
// experience
// selected work
Multi-format e-invoice generation and delivery across UBL, OIOUBL, Svefaktura, SAF-T PL, EDICOM, and Sendys. Handles country-specific validation, retry logic, and audit logging.
Read case study →
A-02Automated accounts receivable dunning — escalation sequences, dynamic templates, scheduling, and full audit trail. Reduced manual AR workload significantly.
Read case study →
Secure data exchange layer connecting internal systems with external finance partners via OAuth 2.0. Handles token refresh, retry queues, and delivery confirmation.
Internal reporting dashboard and audit summary tooling for a financial services company. Aggregates transactional data, generates period reports, and maintains a tamper-evident audit trail. Zero framework dependencies, runs fast on modest hardware.
Read case study →
// about
Code as craft. Finance as context. No overengineering, no framework soup.
I'm Sergey — a developer based in Ukraine, with 8+ years shipping production code in financial services. My background is unusual: an MSc in Enterprise Financial Controlling landed me in tech, so I actually understand the business logic behind the systems I build.
My main arena is backend — Python, Perl, PHP, JS — with a heavy focus on finance integrations: EDI formats, dunning pipelines, SFTP transfers and OAuth handshakes. The kind of plumbing that has to work silently at 4 a.m.
// contact
Considering remote contracts, consulting, and interesting problems. Response guaranteed.