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David K.

David K.

Flutter | SpringBoot | Rust

Hybrid applications are the future—and Flutter stands at the very top as the most powerful choice for businesses that want speed, beauty, and cross-platform consistency. I help brands and founders bring these ideas to life. I’m a Full-Stack Developer, mobile apps enthusiast, and Rust backend engineer with a passion for building experiences that feel effortless, polished, and reliable. With 6+ years of hands-on experience, I specialize in crafting high-performance digital products from the ground up. On the mobile side, I deliver smooth, intuitive apps using: Flutter (my top hybrid framework of choice) React Native Native Android (Kotlin) & Native iOS (Swift) On the backend, I build extremely fast, secure, and scalable APIs powered by Rust, using modern frameworks such as: Actix-Web — blazing-fast, production-grade web services Tokio, SeaORM, Serde, JWT, and other high-performance Rust crates Microservices, async systems, and highly optimized architectures I transform client requirements into solutions that are: Beautiful Functional Performant Reliable in production I don’t just code—I deliver experiences. Getting things done, the right way.

🇰🇪Nairobi, Kenya$10/hr100% JSS4.54 (9)Since Apr 2020

Earnings and projects

MRR
$33

Last 6 months ÷ 6

World#157,847 / 412k
🇰🇪Country#1,077 / 3,243
Revenue, last 30 days
$0

Last 6 months: $198

Total earnings
$4.5k

Billed in all: $4.7k

World#263,643 / 412k
🇰🇪Country#1,933 / 3,243
Per project
$300

$99 in the last 6 months

World#230,990 / 412k
🇰🇪Country#1,668 / 3,243
Projects, last 6 months
2
100% fixed0% hourly
World#88,918 / 412k
🇰🇪Country#531 / 3,243
Projects in all
15

Across 20 contracts

80% fixed20% hourly
World#161,377 / 412k
🇰🇪Country#1,438 / 3,243

Earnings, last 30 days

$4.7kNothing earned in the last 30 daysBilled in all, before Upwork's fee · drag across the chart to see what was earned in any stretch
$4,600$4,650$4,700$4,750Oct 8Oct 23Nov 7

Skill rankings: Top 25% in Spring Boot

Ranked by MRR among everyone on Upwork with the skill.

  1. #41Location-Based Service138 freelancers · 🇰🇪 #1Top 30%
  2. #85Camera259 freelancers · 🇰🇪 #2Top 33%
  3. #170SQLite680 freelancers · 🇰🇪 #6Top 25%
  4. #237User Authentication698 freelancers · 🇰🇪 #3Top 34%
  5. #340Chat & Messaging Software924 freelancers · 🇰🇪 #2Top 37%
  6. #531Spring Boot2,150 freelancers · 🇰🇪 #6Top 25%
  7. #543Hybrid App Development1,431 freelancers · 🇰🇪 #3Top 38%
  8. #824Dart2,324 freelancers · 🇰🇪 #6Top 35%