Need a developer who can jump in, understand your product, and deliver scalable, high-quality solutions?
I help fast-moving startups and e-commerce brands ship faster, scale smarter, and build products that perform. With 9+ years of full-stack experience — with a focus on Shopify, React, and custom web apps — I bring both technical depth and product sense to every project.
What you get:
• Custom Shopify themes, sections & apps that increase conversions
• Responsive React/Next.js frontends that scale cleanly and perform fast
• Seamless backend integrations (Node.js, APIs, databases)
• Strong communication, proactive problem-solving, and on-time delivery
Selected work:
• Shopify: Custom builds for geurwolkje.nl, dekstech.com, nielsenlight.dk
• Web apps: Sports betting ML platform, golfer PWA, admin dashboards
• Web3: Game UI that boosted DAUs by 40% (React + Solana)
• Enterprise: Custom CMS + Big Data tools for the U.S. FDA
I often lead projects as both a Senior Developer and Technical Product Manager, translating business needs into clean architecture, efficient builds, and successful launches.
Let’s build something that your customers will love.
JavaScript
Node.js
React
Web Design
Responsive Design
WordPress
MongoDB
ExpressJS
SQL
TypeScript
Git
CSS
React Native
John L.
Cheyenne, Wyoming
$250/hr
5.0
5 jobs
Providing institutional wind developers, private equity partners, and utility-scale asset managers with independent technical due diligence, data warehouse auditing, and operational risk mitigation.
Leveraging legacy technical advisory pedigree alongside robust, custom-engineered data infrastructure to challenge comfortable underwriting assumptions and deliver unmanaged baseline verifications.
Core Advisory Capabilities:
• Wind Portfolio Performance Audits: Comprehensive deep-dives into asset-level data, isolating regional anomalies, localized terrain effects, and performance ratio variances across national portfolios.
• Technical Due Diligence & Contract Validation: Independent operational reviews of Power Purchase Agreements (PPAs), interconnection parameters, and technical contract structures to ensure data models align with execution realities.
• Data Pipeline Engineering & Automation: Restructuring fragile, manually managed data flows into scalable, automated, and replicable institutional-grade warehouse systems.
Available for flat-rate preliminary consultation audits, fixed-fee portfolio reports, and premium strategic technical due diligence mandates.
Microsoft Excel
R
PHP
SQL
Financial Modeling
Statistics
HTML5
MariaDB
Due Diligence
Energy
Social Media Marketing
Leon M.
Sheridan, Wyoming
$150/hr
4.8
80 jobs
I am a Senior Software Architect specializing in Enterprise Mobile and Enterprise Web Application, SaaS, and API development. I am also the founder of my Upwork Agency, guaranteed.software. To compile a complete list of all skills I offer is now impractical, but below I highlight my skills which are possibly most relevant in today's market.
=============================================
Languages, Frameworks, and Libraries of expertise
=============================================
PHP - Symphony, Laravel, CodeIgniter, Cake, Zend, Magento, WordPress, WooCommerce
JAVASCRIPT - React (Native), Node.js, AngularJS, JQuery
PYTHON - Django, Web2P
JAVA - Spring, Hibernate, Play, Android SDK
HTML5, CSS3 - BOOTSTRAP
SASS/SCSS
LESS
=================
Data Persistance
=================
MongoDB
SQL - MySQL, PostgreSQL, OracleDB, MSSQL
Memcached
LDAP
File Systems
=============================
OS and Deployment Environment
=============================
*** OS ****************************
Unix - MacOS
Linux - Ubuntu, CentOS
Windows Server
************************************
*** Deployment Environment *******************************************
Dedicated Servers, VPS
Cloud-Based - AWS, Heroku, Google Cloud, Openshift, Docker
Web Servers - Apache, Ngix
*******************************************************************************
=======================
Testing
=======================
BDD: Behat, PHPSpec (PHP), JBehave (Java), behave (Python)
TDD: PHPUnit (PHP), JUnit (Java)
HTML & CSS Regression Testing: BackStopJS (CasperJS, PhantomJS, ResembleJS)
=========================
Additional Workflow Notes
=========================
Though this may seem like a lot of computer jargon, it is important to mention a few other details to development that are instrumental in allowing me to guide your project to success. I am more than happy to explain anything that you are uncertain about prior to starting the project and we can determine what is and is not essential.
I find that setting up bi-weekly, and sometimes daily 5 minute SCRUMs is very beneficial by keeping everyone on the same page. It is commonplace for us to use project management software on all projects. Currently, I prefer using Jira, Asana or Trello. If you don't have something like this already, I can set this up for you. For SCM, I typically use GIT on GitHub or BitBucket, often in conjunction with Hudson, Jenkins, or Travis CI. If you do not have these things set up, I can instantly get these rolling for you.
I am very comfortable with working in your own development environment, if it already exist, whether it is cloud-based like AWS or if it is on a VPS or Dedicated Server(s). I also maintain an internal development server which is ready for use in the case that you do not already have an established development environment.
Finally, comprehensive project estimation and consultation on the best approach to completing your project can be done in a separate, fixed-price project at $100 USD. Due to previous experience, It is no longer possible to offer consultation or any deliverables prior to being hired outside of the aforementioned arrangement.
I'm looking forward to providing you success, guaranteed!!!
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