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Zilvinas B.
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Zilvinas B.

Advanced Back-End Development | System Architect | TypeScript Expert

"Zilvinas is very professional. It was easy to work and communicate with him. He finished the project on time and delivered more than I have expected." As a Full-stack Software Engineer and System architect with over 15 years of experience, I have developed complex solutions for Banks, Power Plants, Utilities, Governments, and Startups, including Fortune 500 companies such as NEC Corporation and Rolls-Royce. I bring a wealth of expertise to every project I work on. My specialty lies in building complex full-stack solutions, starting from system architecture, continuing to database design, business logic, and all the way to the frontend. Throughout the process, I ensure optimization, performance tuning, and seamless integration of third-party systems to deliver exceptional software development solutions for my clients. Here are the services I offer: ✅ Software Architecture and Design ✅ Backend (server-side) development (.NET, NodeJS, NestJS) ✅ IoT systems development (AWS IoT, Azure IoT Hub, Custom solutions) ✅ iOS and Android development (Swift, Kotlin) ✅ Agile Software Project Management ✅ Tech Startup Consulting (remote CTO) When you choose to work with me, you can expect: ✅ The delivery of what I promise, and more ✅ My unwavering commitment to your business needs, delivering solutions that are the best fit for your organization ✅ Open communication channels and 24/7 availability Here's what one of my clients had to say about my work: "Zilvinas has profound technical knowledge and organizational skills. He has what it takes to make a wonderful project leader." - Aaron Iva. If you're ready to bring my expertise to your project, here's how we can get started: 1️⃣ Click the green "Invite" button in the upper-right corner of this page to invite me to your job. 2️⃣ I'll jump on Zoom with you to discuss all the details of your project. Let's work together to take your business to the next level. Invite me to your job, and let's get started!

🇱🇹Kaunas, Lithuania$100/hr100% JSS5.00 (8)Since Apr 2017

Earnings and projects

MRR
$11k

Last 6 months ÷ 6

World#1,024 / 412k
🇱🇹Country#2 / 452
Revenue, last 30 days
$12k

Last 6 months: $66k

World#956 / 412k
🇱🇹Country#3 / 452
Total earnings
$640k

Billed in all: $674k

World#1,612 / 412k
🇱🇹Country#2 / 452
Per project
$71k

$66k in the last 6 months

World#437 / 412k
🇱🇹Country#2 / 452
Projects, last 6 months
1
0% fixed100% hourly
World#128,095 / 412k
🇱🇹Country#126 / 452
Projects in all
9

Across 14 contracts

36% fixed64% hourly
World#212,270 / 412k
🇱🇹Country#238 / 452

Earnings, last 30 days

$674k+$12k earned in the last 30 daysBilled in all, before Upwork's fee · drag across the chart to see what was earned in any stretch
$660k$670k$680kOct 8Oct 23Nov 7

Skill rankings: Top 0.30% in Project Management

Top 1% in 10 of 13 skills, ranked by MRR among everyone on Upwork with the skill.

  1. #4AWS IoT Core192 freelancers · 🇱🇹 #1Top 2%
  2. #6MQTT252 freelancers · 🇱🇹 #1Top 2%
  3. #11Internet of Things718 freelancers · 🇱🇹 #1Top 2%
  4. #13Scrum1,840 freelancers · 🇱🇹 #1Top 0.71%
  5. #14NestJS3,757 freelancers · 🇱🇹 #1Top 0.37%
  6. #19.NET Framework2,944 freelancers · 🇱🇹 #1Top 0.65%
  7. #22Swift3,634 freelancers · 🇱🇹 #1Top 0.61%
  8. #28Firebase6,978 freelancers · 🇱🇹 #1Top 0.40%