Jarka Košanová - Senior full-stack engineer (EU time zones)
Creating new web applications or helping your team improve what you already have.
Experience
Backend
Frontend
Integrations
From idea to a working web app, including architecture, development, and launch.
Jump into an existing project, ship features, and improve reliability without slowing the team down.
Connect products and services (payments, CRM, email tools, analytics) with stable APIs and webhooks.
Add practical AI to your product: assistants, automation, and AI integrations tied to your data.
Speed up slow pages and queries, improve database design, and educe maintenance overhead.
Refactor safely, add tests, fix recurring issues, and make the product easier to change.
I'm Jarka, a senior backend/full-stack engineer based in Zruč-Senec, a small village near Pilsen, Czech Republic. After 9 years at GitLab and experience across startups and enterprise, I now work independently with teams or clients who need reliable, senior-level help.
Built an AI-powered assistant that turns user input into structured itineraries and planning outputs. Designed practical AI features and automation workflows for real usage, with a focus on maintainability and a smooth user experience.
Built and shipped backend-heavy product features in a large-scale codebase. Led development on larger initiatives: shaped the technical approach, proposed architecture, broke work into deliverable slices, and drove execution from design through rollout. Delivered production integrations (including Salesforce) and contributed to planning-related features.
Built integrations that pulled data from multiple hotel booking systems into the product. Worked across different vendors, APIs, and data formats, focusing on reliable ingestion and predictable behavior in edge cases.
Worked on large-scale email systems with high demands on stability and performance. Focus on production reliability, troubleshooting, and changes that hold up under load.
