Serhii O.
FreelancerTop Rated PlusSenior Mobile Developer | Mobile App Development | Long-Term | IoT
Member since 2010 Β· 100% Job Success
View on Upwork
WorldTop 0.1%
CanadaTop 0.22%
JavaScriptTop 0.16%
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upworkrank#61in JavaScript Β· Top 0.16%Share this rank
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$17k
MRR
est. monthly
#356
World rank
of 372,170
$0
Lifetime earnings
since 2010
31
Total jobs
completed
About
π₯ ππ¨π© π% πππ₯ππ§π - ππ±π©ππ«π ππππππ on Upwork. I help startups and product teams build fast, clean, and scalable mobile apps. π¨βπ» As a senior full stack developer with over 15 years of experience, I build apps that help startups and businesses grow.
π§ ππ‘ππ π ππ¨
- Mobile Apps (iOS + Android): 40+ apps delivered. 25+ published to the App Store (β 4.7 avg). Performance optimized, CI/CD deployed, built to scale.
- IoT & BLE: Deep expertise with ESP32, custom firmware, Bluetooth, and AWS IoT. Smart devices, real-time sync, low-latency control.
- AI/ML Integration: ChatGPT, ML models, and automation embedded into mobile/web apps. 5+ AI chatbots, 4 ML features built.
- Web Backend + Frontend: Full-stack engineer using Node.js, React, Laravel, MySQL. Solid APIs, fast UIs, maintainable code.
π± πππππ§π ππ¨π«π€
- BLE-based TV Lift Controller: IoT app + firmware. 99.9% uptime. Reduced support tickets by 85%.
- Fitness Social Platform (Flutter): Scaled to 50K+ users. 40% MoM growth.
- QSR Ops Platform: Internal tool for 200+ fast food locations (Taco Bell, KFC, etc). Saved $1.2M/yr in ops cost.
- Sports Team App: Booking, scheduling, payments. Now used by 15K+ hockey players.
π§° πππππ€
Mobile: Flutter, Dart, React Native, Swift
Web: React.js, Node.js, Laravel
IoT: BLE, ESP32, Arduino, AWS IoT
AI: Python, OpenAI API, TensorFlow
DevOps: CI/CD, GitHub Actions, Docker
Tools: Figma, Postman, Firebase, MySQL
β
ππ‘π² ππ?
- Built MVPs and scaled platforms β not just code, real products
- Own the process β architecture to deployment
- Communicate clearly
- Proactive
- Detail-oriented
Rankings
Where Serhii O. ranks by monthly revenue, worldwide, in Canada, and in every Upwork skill it competes in.
World#356 / 372,170Top 0.1%
Canada#14 / 6,511Top 0.22%JavaScript#61 / 38,951Top 0.16%
CSS#19 / 16,530Top 0.11%
HTML#24 / 16,373Top 0.15%
PHP#31 / 19,744Top 0.16%
API#22 / 8,146Top 0.27%
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Freelancer snapshot
On Upwork since2010
Rating100% Job Success
Skills tracked5
Skills
JavaScriptCSSHTMLPHP
Serhii O. works mainly in JavaScript, ranking top 0.16% of freelancers in that skill.
MRR trendSoon
Last 12 weeks
Coming soon
Competitors on the board
Who ranks just above and below by MRR across all freelancers.
This freelancer is #356 of 372,170 across all freelancers.
RankFreelancerMRRMRR trend
MRR benchmark
Serhii O. earns more than 99.9% of all freelancers we track.
Top 0.1%
among all freelancers we track
$0β$500
32%
$500β$1k
12%
$1kβ$2.5k
17%
$2.5kβ$5k
13%
$5kβ$10k
12%
$10kβ$25k
10%
$25kβ$50k
3%
$50k+
1%
Serhii O.'s bracket Β· $17k
You32%$0β$500
You12%$500β$1k
You17%$1kβ$2.5k
You13%$2.5kβ$5k
You12%$5kβ$10k
You10%$10kβ$25k
You3%$25kβ$50k
You1%$50k+
Serhii O. earns an estimated $17k/mo. That's 11.6Γ the typical freelancer and more than 99.9% of everyone we track.
Freelancers with no recent MRR are excluded. Only the 150,997 freelancers with active monthly revenue are ranked here.
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MRR is an estimate from Upwork's public figures - not an Upwork-official number.