You will get Fast API Backend, High-Performance Python API Development
Project details
Launch Your Backend: High-Performance Python REST APIs Built with FastAPI.
Are you looking for a modern, blazingly fast, and scalable backend solution? Stop building slow services with outdated frameworks. I deliver professional, production-ready REST APIs using FastAPI—the industry's leading Python framework known for its incredible speed, high concurrency, and automatic documentation.
Why choose a FastAPI project?
FastAPI leverages modern Python features and technologies like Starlette and Pydantic, giving you massive advantages. It delivers API performance that is on par with compiled languages like Node.js and Go, making your application highly scalable and efficient. By using Pydantic, your API includes automatic, robust data validation and serialization, drastically reducing development time and eliminating common runtime bugs. This translates directly to a more reliable service and lower operational costs for you.
I focus on delivering a service that ensures your development timeline stays on track and your final product is secure and fast. Choose this fixed-price project for a transparent, efficient way to launch your high-performance Python backend.
Are you looking for a modern, blazingly fast, and scalable backend solution? Stop building slow services with outdated frameworks. I deliver professional, production-ready REST APIs using FastAPI—the industry's leading Python framework known for its incredible speed, high concurrency, and automatic documentation.
Why choose a FastAPI project?
FastAPI leverages modern Python features and technologies like Starlette and Pydantic, giving you massive advantages. It delivers API performance that is on par with compiled languages like Node.js and Go, making your application highly scalable and efficient. By using Pydantic, your API includes automatic, robust data validation and serialization, drastically reducing development time and eliminating common runtime bugs. This translates directly to a more reliable service and lower operational costs for you.
I focus on delivering a service that ensures your development timeline stays on track and your final product is secure and fast. Choose this fixed-price project for a transparent, efficient way to launch your high-performance Python backend.
Programming Languages
PHP, JavaScript, PythonCoding Expertise
Localization, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$250
|
Standard
$400
|
Advanced
$500
|
|---|---|---|---|
| Delivery Time | 1 day | 2 days | 3 days |
Number of Revisions | Unlimited | Unlimited | Unlimited |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
Optional add-ons
You can add these on the next page.
Content Upload
(+ 2 Days)
+$250
API Testing Report
(+ 1 Day)
+$250Frequently asked questions
5 reviews
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BM
Bee M.
Jan 31, 2026
Wordpress website update
This is the second job completed. Darryn and his team have been come a reliable team to lean on. Thanks for this completed job
OR
Omer R.
Dec 10, 2025
Create a Shopify Store
Thank you for the communication.
OR
Omer R.
Nov 26, 2025
Coming Soon Landing Page
Astonishing professionalism, and skill. Darryn is a unicorn on Upwork and I would highly recommend him for any work.
BM
Bee M.
Nov 4, 2025
Wordpress website update
Onto a great start. Excellent collaboration with this team. They are responsive to feedback and patient
RB
Robina B.
Sep 27, 2025
Develop 3 APIs method with Python Flask
Darryn was fantastic to work with. He built three API methods in Flask, complete with thorough testing scripts, and delivered exactly what I needed. His communication was excellent, and he was highly responsive to feedback and adjustments. The code was clean, well-documented, and worked flawlessly. I wouldn't hesitate to hire him again for future projects and would highly recommend him to anyone looking for a skilled and reliable developer.
About Darryn
Shopify Expert | WordPress & WooCommerce Developer | Full-Stack
86%
Job Success
Thornhill, Canada - 1:03 am local time
Looking for a Shopify developer who delivers on time, communicates clearly, and builds stores that actually convert? You've found the right person.
I'm a Canada-based full-stack developer with a Master's degree in Computer Science and over 12 years of professional software engineering experience — including roles as a Web Architect Manager and Principal Software Engineer. I now bring that same engineering discipline to Shopify, WordPress, and WooCommerce projects, delivering custom stores, theme development, and full-stack web solutions for startups, agencies, and small businesses across North America and beyond.
Every project I've completed on Upwork has earned 5-star feedback — I focus on quality over volume, and I treat every project like my own business is on the line.
🏆 𝗪𝗛𝗬 𝗖𝗟𝗜𝗘𝗡𝗧𝗦 𝗞𝗘𝗘𝗣 𝗖𝗢𝗠𝗜𝗡𝗚 𝗕𝗔𝗖𝗞
✔ 12+ years of professional software engineering background
✔ 100% 5-star rating on completed Upwork projects
✔ Master's in Computer Science — real engineering discipline, not just theme-editing
✔ Canada-based — North American timezone & business culture
✔ Clean, scalable, secure code with zero shortcuts
✔ Fast communication (respond within hours, not days)
✔ On-time delivery, every single time
✔ Full post-launch support & long-term maintenance
🛍️ 𝗦𝗛𝗢𝗣𝗜𝗙𝗬 𝗗𝗘𝗩𝗘𝗟𝗢𝗣𝗠𝗘𝗡𝗧 (Primary Focus)
- Shopify Store Setup & Full Customization
- Custom Shopify Theme Development (Liquid)
- Shopify Plus Development & Migration
- Shopify Apps Integration & Custom App Solutions
- Shopify Speed Optimization & Core Web Vitals
- Shopify Product Pages, Checkout & Cart Customization
- Shopify SEO & Conversion Rate Optimization
- Shopify to WooCommerce Migration (and reverse)
- Ongoing Shopify Store Maintenance & Bug Fixes
⚙️ 𝗪𝗢𝗥𝗗𝗣𝗥𝗘𝗦𝗦 𝗗𝗘𝗩𝗘𝗟𝗢𝗣𝗠𝗘𝗡𝗧
- Custom WordPress Website Development (from scratch)
- WordPress Theme Development — Figma / XD / PSD to WordPress
- Custom WordPress Plugin Development
- WordPress Website Redesign & Revamp
- WordPress Speed Optimization & Core Web Vitals (PageSpeed 90+)
- WordPress Security Hardening & Malware Removal
- WordPress Migration & Hosting Transfer
- Gutenberg / Full Site Editing (FSE) Development
🛒 𝗪𝗢𝗢𝗖𝗢𝗠𝗠𝗘𝗥𝗖𝗘 𝗗𝗘𝗩𝗘𝗟𝗢𝗣𝗠𝗘𝗡𝗧
- WooCommerce Store Setup & Full Customization
- Custom WooCommerce Product Pages & Checkout Flows
- WooCommerce Payment Gateway Integration (Stripe, PayPal, Square)
- WooCommerce Subscription & Membership Websites
- High-Volume WooCommerce Stores (1,000+ products)
- WooCommerce CRO Audit & Conversion Optimization
- WooCommerce REST API & Third-Party Integrations
🎨 𝗘𝗟𝗘𝗠𝗘𝗡𝗧𝗢𝗥 𝗘𝗫𝗣𝗘𝗥𝗧
- Elementor Pro Website Design & Development
- Elementor Custom Widgets & Dynamic Templates
- Elementor Landing Page Design (high-converting)
- Elementor to Custom Theme Conversion
🔧 𝗔𝗗𝗩𝗔𝗡𝗖𝗘𝗗 𝗘𝗫𝗣𝗘𝗥𝗧𝗜𝗦𝗘
- ACF (Advanced Custom Fields) — Flexible & Repeater Fields, CPTs
- WPML — Multilingual Website Setup & Translation Management
- LMS Development — LearnDash, LifterLMS, Tutor LMS, MemberPress
- Custom API Development — Python (Flask) & REST API Integrations
🛠️ 𝗧𝗘𝗖𝗛𝗡𝗜𝗖𝗔𝗟 𝗦𝗞𝗜𝗟𝗟𝗦
Shopify · Shopify Plus · Shopify Liquid · WordPress · WooCommerce · Elementor Pro · PHP · Python · JavaScript · HTML5 · CSS3 · MySQL · REST API · ACF · WPML · LearnDash · Stripe · PayPal · Flask
📩 𝗥𝗘𝗔𝗗𝗬 𝗧𝗢 𝗦𝗧𝗔𝗥𝗧? 𝗟𝗘𝗧'𝗦 𝗧𝗔𝗟𝗞.
Whether you need a custom Shopify store, a WordPress website, a WooCommerce shop, or an Elementor landing page — send me a message and let's build something that actually works for your business.
I respond fast. Let's talk today.
Steps for completing your project
After purchasing the project, send requirements so Darryn can start the project.
Delivery time starts when Darryn receives requirements from you.
Darryn works on your project following the steps below.
Revisions may occur after the delivery date.
Requirements Validation and Project Setup
Core Structure and Database Integration