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Asier B.
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Asier B.

Real-time Embedded Firmware | Full-Stack Web | Desktop App

I build production-grade embedded and IoT systems, from firmware to cloud integration. With 10+ years in C and RTOS, like FreeRTOS, ThreadX, TI-RTOS, Zephyr.... I’ve delivered motor/sensor and connectivity-heavy products using lwIP and MQTT on NXP i.MX RT, ESP32, and STM32. When the project needs it, I also develop Python backends, REST APIs, and Docker dashboards. My working style is structured and transparent: clear specs, regular progress updates, and clean handover documentation.

🇪🇸San Sebastian, Spain$40/hr100% JSS5.00 (1)Since Jan 2026
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Earnings and projects

MRR
$1.6k

Last 6 months ÷ 6

World#29,047 / 412k
🇪🇸Country#294 / 4,023
Revenue, last 30 days
$2.5k

Last 6 months: $9.8k

World#16,226 / 412k
🇪🇸Country#182 / 4,023
Total earnings
$10k

Billed in all: $11k

World#194,303 / 412k
🇪🇸Country#1,881 / 4,023
Per project
$2.6k

$2.5k in the last 6 months

World#63,375 / 412k
🇪🇸Country#592 / 4,023
Projects, last 6 months
4
75% fixed25% hourly
World#51,813 / 412k
🇪🇸Country#445 / 4,023
Projects in all
4
75% fixed25% hourly
World#283,741 / 412k
🇪🇸Country#2,724 / 4,023

Earnings, last 30 days

$11.3k+$2.5k earned in the last 30 daysBilled in all, before Upwork's fee · drag across the chart to see what was earned in any stretch
$8k$10k$12kOct 8Oct 23Nov 7

Skill rankings: Top 6% in HTML5

Ranked by MRR among everyone on Upwork with the skill.

  1. #5Modbus68 freelancers · 🇪🇸 #1Top 7%
  2. #7ARM Cortex-M68 freelancers · 🇪🇸 #1Top 10%
  3. #16TCP/IP148 freelancers · 🇪🇸 #1Top 11%
  4. #27FreeRTOS200 freelancers · 🇪🇸 #1Top 14%
  5. #37MQTT252 freelancers · 🇪🇸 #1Top 15%
  6. #68STM32545 freelancers · 🇪🇸 #1Top 12%
  7. #97ESP32780 freelancers · 🇪🇸 #1Top 12%
  8. #127C1,974 freelancers · 🇪🇸 #5Top 6%