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Heri S.
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Heri S.

Senior Product Engineer | Expert in Frontend Systems, Web Performance

I help businesses transform complex designs into high-performance digital products. Specializing in modern headless architectures, performance engineering, and AI automation, I bridge the gap between sophisticated UI/UX and scalable backend/frontend logic. Core Expertise & Latest Stack: Modern Frontend: React, Next.js, TypeScript, Tailwind CSS, VueJS, React Native, Hyperformula. AI, Automation & DevOps: n8n, Slack/ChatOps, Git CI/CD (Bitbucket, GitLab, GitHub), GPT-4 API integration, NodeJS, AWS Lambda. Performance: UI latency reduction, code refactoring, and optimizing build processes (e.g., Babel to ESBuild). eCommerce & CMS: Headless CMS (Sanity, Storyblok), WooCommerce (WP Engine specialist), Shopify, Magento. Case Studies: NEW: AI-Powered ChatOps Pipeline: Architected an automated pipeline connecting Slack to n8n to CI/CD (Bitbucket, GitLab, GitHub), allowing AI to automatically analyze UI issues/PDFs uploaded via chat and trigger automated hotfix workflows. NEW: High-Performance eCommerce Deployment: Architected a scalable WooCommerce solution on WP Engine, leveraging managed caching and automated deployment pipelines for high-traffic stability. AI & Automation: Developed GPT-4 function call wrapper to easily communicate with OpenAPI Specifications. Serverless Architecture: Deployed NextJS based APIs using AWS Lambda. Legacy Modernization: Complete rewrites of web applications from Javascript to Typescript. AI Widgets: Developed Chat UI widget integrated with AI, using NodeJS and Serverless Engine. Low-Code Innovation: Developed Strapi plugins to create a low-code app builder. Performance Engineering: Sped up build processes from 1 hour (using Babel) to less than 5 minutes (using ESBuild). MVP Development: Turned Webflow/Figma designs into interactive MVPs, digital reports, or functional prototypes. Enterprise Contribution: Contributed to a full stack web/desktop/mobile application (Expensify). UI Revamp: Modernized web apps with various UI libraries (Material UI, Tailwind, Styled Components). Apps I Have Developed: - AI-driven automation workflows & ChatOps tools - Interactive digital platforms & content-heavy reporting dashboards - Low-code applications & app builders - High-conversion e-commerce platforms - Accounting & business management systems - Real-time multiplayer web-based games I have worked in the field for over a decade, launching my web development services on Upwork back when it was oDesk. Since then, I have evolved with the industry, moving from the jQuery era to today’s fast-changing ecosystem of React, Next.js, and AI automation. This deep history gives me a unique advantage in engineering, ensuring I can handle both cutting-edge headless builds and complex legacy infrastructure migrations. How can I help you today? Let’s talk.

🇮🇩Bandung, Indonesia$56/hr100% JSS4.84 (65)Since Mar 2010

Earnings and projects

MRR
$1.5k

Last 6 months ÷ 6

World#31,412 / 412k
🇮🇩Country#226 / 5,725
Revenue, last 30 days
$1.1k

Last 6 months: $9.2k

World#40,847 / 412k
🇮🇩Country#403 / 5,725
Total earnings
$228k

Billed in all: $236k

World#12,450 / 412k
🇮🇩Country#68 / 5,725
Per project
$2.6k

$4.6k in the last 6 months

World#62,421 / 412k
🇮🇩Country#473 / 5,725
Projects, last 6 months
2
50% fixed50% hourly
World#88,918 / 412k
🇮🇩Country#1,627 / 5,725
Projects in all
87

Across 95 contracts

46% fixed54% hourly
World#33,169 / 412k
🇮🇩Country#366 / 5,725

Earnings, last 30 days

$236k+$1.1k earned in the last 30 daysBilled in all, before Upwork's fee · drag across the chart to see what was earned in any stretch
$234k$235k$236kOct 8Oct 23Nov 7

Skill rankings: Top 6% in CSS 3

Ranked by MRR among everyone on Upwork with the skill.

  1. #22Serverless Stack227 freelancers · 🇮🇩 #2Top 10%
  2. #37Amazon Bedrock204 freelancers · 🇮🇩 #1Top 18%
  3. #106Snowflake621 freelancers · 🇮🇩 #1Top 17%
  4. #232Redux3,245 freelancers · 🇮🇩 #2Top 7%
  5. #566Tailwind CSS6,978 freelancers · 🇮🇩 #11Top 8%
  6. #617CSS 39,914 freelancers · 🇮🇩 #8Top 6%
  7. #795Front-End Development8,892 freelancers · 🇮🇩 #11Top 9%
  8. #823AI App Development4,708 freelancers · 🇮🇩 #2Top 17%