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Kyrylo O.
Expert-Vetted

Kyrylo O.

Full-Stack Development Partner for Modernization, SaaS & AI-Accelerate

🔥 Send me your idea — and I’ll give you a free initial consultation with practical thoughts, possible solutions, and a rough time and cost estimate. Legacy systems draining budget, slowing delivery, and blocking growth? At OSKI Solutions, we help companies modernize legacy applications and build scalable cloud-ready products with our 3x delivery strategy: experienced engineers + AI-assisted coding + disciplined execution. That means you get more than just developers. You get a team that can move significantly faster on implementation, reduce repetitive work through AI-assisted workflows, and still keep architecture, maintainability, and business priorities under control. Most of our engineers are from Ukraine, and we’ve built a delivery model that combines strong technical talent with modern AI tools to help clients ship faster without sacrificing code quality. Over the past 20+ years, I’ve worked as a senior engineer, architect, and ex-CTO, helping startups, SMBs, and enterprise clients rebuild outdated systems into secure, scalable, future-ready platforms. We work hands-on with .NET, Node.js, React, and modern cloud infrastructure to turn brittle systems into products that are easier to maintain, extend, and grow. What we do best Backend Development .NET Core, ASP.NET MVC, C#, Entity Framework Node.js, Express, REST APIs, GraphQL APIs Microservices, event-driven systems, business-critical backend logic Frontend Development React, Next.js, TypeScript, Redux Angular, Vue.js, SPA and PWA development Responsive interfaces, Tailwind, Material UI Legacy Modernization Legacy .NET and custom business platform modernization Monolith to modular/cloud migration Performance, maintainability, and technical debt reduction CMS & Business Platforms Umbraco CMS, Umbraco Cloud, migrations, custom development ERP-related systems and workflow platforms Internal tools, client portals, dashboards, admin systems Cloud & DevOps Azure, AWS, Google Cloud Docker, Kubernetes, CI/CD pipelines GitHub Actions, GitLab CI, deployment automation Databases SQL Server, PostgreSQL, MySQL MongoDB, Redis, caching and query optimization API Integrations & SaaS Stripe, PayPal, Twilio, SendGrid Slack, Shopify, Zoom, QuickBooks, Google Maps SaaS integrations, workflow automation, external service connectivity Why clients choose OSKI Solutions 3x delivery strategy: senior engineers + AI-assisted coding + structured execution 20+ years of experience modernizing complex systems CTO-level thinking focused on business outcomes, not just tickets Full-cycle delivery from architecture to deployment Lean, practical approach that keeps MVPs and modernization efforts within scope Clear communication with weekly demos, tracked hours, and transparent reporting Selected results One Motion Technologies — designed and built ERP system from scratch TutorPro — helped scale a SaaS platform, supporting 3x adoption growth in 2 years Umbraco platforms — delivered 15+ CMS and business platforms, including cloud migrations and integrations What our 3x approach means in practice We use AI to accelerate coding, prototyping, refactoring, and repetitive engineering tasks — but not to replace engineering judgment. The result is: faster delivery, cleaner implementation, better budget efficiency, and a stronger technical foundation for future scaling. 💬 Send me a message, and I’ll review your project, suggest the best approach, and give you a realistic next-step plan.

🇵🇱Warsaw, Poland$60/hr100% JSS5.00 (22)Since Nov 2018

Earnings and projects

MRR
$198

Last 6 months ÷ 6

World#113,686 / 412k
🇵🇱Country#758 / 2,852
Revenue, last 30 days
$261

Last 6 months: $1.2k

World#77,198 / 412k
🇵🇱Country#488 / 2,852
Total earnings
$267k

Billed in all: $273k

World#9,512 / 412k
🇵🇱Country#191 / 2,852
Per project
$10k
World#15,393 / 412k
🇵🇱Country#214 / 2,852
Projects, last 6 months
0

Across 1 contracts

0% fixed100% hourly
World#209,850 / 412k
🇵🇱Country#1,392 / 2,852
Projects in all
26

Across 30 contracts

57% fixed43% hourly
World#109,599 / 412k
🇵🇱Country#779 / 2,852

Earnings, last 30 days

$273k+$261 earned in the last 30 daysBilled in all, before Upwork's fee · drag across the chart to see what was earned in any stretch
$273.0k$273.2k$273.4k$273.6kOct 8Oct 23Nov 7

Skill rankings: Top 20% in Angular

Ranked by MRR among everyone on Upwork with the skill.

  1. #5Umbraco Cloud23 freelancers · 🇵🇱 #1Top 22%
  2. #33Umbraco161 freelancers · 🇵🇱 #2Top 20%
  3. #586ASP.NET2,819 freelancers · 🇵🇱 #12Top 21%
  4. #725.NET Core3,067 freelancers · 🇵🇱 #13Top 24%
  5. #1,356Angular6,816 freelancers · 🇵🇱 #19Top 20%
  6. #1,708Vue.js8,267 freelancers · 🇵🇱 #31Top 21%
  7. #1,813C#8,348 freelancers · 🇵🇱 #25Top 22%
  8. #2,060SaaS Development5,201 freelancers · 🇵🇱 #17Top 40%