Serhii O.
FreelancerTop Rated PlusSenior Mobile Developer | Mobile App Development | Long-Term | IoT
Member since 2010 · 100% Job Success
View on Upwork
WorldTop 0.03%
CanadaTop 0.08%
JavaScriptTop 0.14%
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upworkrank#54in JavaScript · Top 0.14%Share this rank
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$17k
MRR
est. monthly
#356
World rank
of 1,044,463
$0
Lifetime earnings
since 2010
32
Total jobs
completed
About
🥇 𝐓𝐨𝐩 𝟏% 𝐓𝐚𝐥𝐞𝐧𝐭 - 𝐄𝐱𝐩𝐞𝐫𝐭 𝐕𝐞𝐭𝐭𝐞𝐝 on Upwork. I help startups and product teams build fast, clean, and scalable mobile apps. 👨💻 As a senior full stack developer with over 15 years of experience, I build apps that help startups and businesses grow.
🔧 𝐖𝐡𝐚𝐭 𝐈 𝐃𝐨
- Mobile Apps (iOS + Android): 40+ apps delivered. 25+ published to the App Store (⭐ 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.
📱 𝐑𝐞𝐜𝐞𝐧𝐭 𝐖𝐨𝐫𝐤
- 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.
🧰 𝐒𝐭𝐚𝐜𝐤
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
✅ 𝐖𝐡𝐲 𝐌𝐞?
- Built MVPs and scaled platforms — not just code, real products
- Own the process — 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 / 1,044,463Top 0.03%
Canada#14 / 17,165Top 0.08%JavaScript#54 / 39,433Top 0.14%
CSS#15 / 15,786Top 0.1%
HTML#23 / 15,819Top 0.15%
PHP#29 / 18,855Top 0.15%
API#20 / 7,990Top 0.25%
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Freelancer snapshot
On Upwork since2010
Rating100% Job Success
Skills tracked5
Skills
JavaScriptCSSHTMLPHP
Serhii O. works mainly in JavaScript, ranking top 0.14% 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 1,044,463 across all freelancers.
RankFreelancerMRRMRR trend
MRR benchmark
Serhii O. earns more than 99.97% of all freelancers we track.
Top 0.03%
among all freelancers we track
$0–$500
32%
$500–$1k
12%
$1k–$2.5k
17%
$2.5k–$5k
13%
$5k–$10k
12%
$10k–$25k
10%
$25k–$50k
3%
$50k+
1%
Serhii O.'s bracket · $17k
You32%$0–$500
You12%$500–$1k
You17%$1k–$2.5k
You13%$2.5k–$5k
You12%$5k–$10k
You10%$10k–$25k
You3%$25k–$50k
You1%$50k+
Serhii O. earns an estimated $17k/mo. That's 11.4× the typical freelancer and more than 99.97% of everyone we track.
Freelancers with no recent MRR are excluded. Only the 151,012 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.