Senior, hands-on engineering — design, architecture, and code, not just management.
Custom app development | Embedded senior developer
I design and ship custom web and mobile applications from idea to production. When you already have a team but need extra senior firepower, I plug in as an embedded developer and help you move faster. 15 years of hands-on experience, no agency layers.
Jarka Košanová
15+ years of software development experience
I take web and mobile applications from idea to production — discovery, design, build, ship. Client portals, internal tools, customer-facing apps, custom SaaS.
Example: You have a product idea but no dev team. I design the architecture, build the app, and deploy it — and stay on for the next iterations.
How I work
Already have a team but need extra senior capacity? I join as a contractor — pair with your developers, own features end to end, raise the bar on code quality and architecture.
Example: Your team is shipping but stretched thin on backend. I embed for 3-6 months, take ownership of a hard initiative, and leave behind clean, documented code.
How embedding works
When the right answer is not a full app, I plug things together. AI for document processing and routine work, system integrations, custom scripts and internal tooling.
Example: Orders flow from your e-commerce platform into accounting and inventory automatically — and AI handles the invoices nobody wants to retype.
Solution examplesFounders, product teams, and companies that need senior engineering — without hiring an agency.
I am Jarka Košanová. 15 years building production software — nine of them at GitLab, where I owned complex backend initiatives end to end, shipped APIs and integrations used by millions, and worked across teams on hard architectural problems.
Before that, I built banking integrations at a fintech, hotel-system integrations, and a university portal. I have shipped greenfield products and joined existing codebases to push them forward. I bring that to your project — whether you need someone to build the whole thing or someone to join your team and own the hardest parts.
Senior, hands-on engineering — design, architecture, and code, not just management.
Two clear ways to work together: full project delivery, or embedded in your team.
Production-grade code with the testing and review standards I brought from GitLab.
Direct collaboration with me. No agency middle layer, no junior swap-out after kickoff.
„Jarka really stood out for her focus and her ability to consistently deliver high-quality work on time. She has a very pragmatic, no-nonsense approach. She takes ownership and just gets things done, without unnecessary discussion or overhead.“
„By working in multiple teams, Jarka developed an incredibly deep understanding of the system's overall complexity. She used this knowledge to break down and solve our hardest technical problems. She took on complex initiatives and confidently drove them to the finish line. She also raised the quality bar for everyone involved while still keeping the work practical and shippable.“
„Jarka is an excellent collaborator, engineer, leader, and person. It was a joy to work with her at GitLab. She's a true asset to any organization and has the technical capacity and willpower to drive any project forward successfully.“
Tell me what you are building or where your team is stuck. I help you figure out whether this is a full build, an embedded engagement, or something smaller — and whether I am the right fit.
For a full build: scope, architecture, timeline, and price. For embedding: target initiative, time commitment, and how I plug into your workflow.
On a full build I deliver in short cycles you can react to. Embedded, I onboard fast and start owning real work in the first weeks.
After launch — or after the embedded engagement wraps — I am available for further iterations, support, and the next thing on the roadmap.
