**Derek Otieno**
Senior Full Stack Engineer (App | Mobile | Web | Bot | AI/ML | ChatGPT)
Fredericksburg, VA 22408
derek.otieno.2020@gmail.com
+1 (804) 596-5909

✅ MSCS | 🇺🇸 Based in Virginia
React | .NET C# | Node | Laravel | Native Mobile | ROR

### Summary
Experienced Senior Engineer with a Master's in Computer Science, specializing in web, mobile, scraping/bot, and AI/ML solutions. Passionate about resolving client queries and eager to collaborate.

### Technical Skills
**Languages & Frameworks:**
- ASP.NET C#, Xamarin, WPF, C++, Golang, Qt
- Java, Java Spring, Kotlin, Swift, Flutter, React Native, Objective-C
- ES6, TypeScript, Angular, React.js, Redux, Next.js, Vue.js, Nuxt.js, Ember.js
- Node.js, Express, Nest.js, Feathers.js, JEST
- Prisma, TypeORM, MongoDB, Sequelize, Entity Framework
- GraphQL, Cube, Redis, Memcached
- Electron.js, NW.js, Node-GUI, Chrome Extension
- Puppeteer, Playwright, Selenium, Scrapy, Chrome DevTools Protocol
- Python, Django, Flask, NumPy, SciPy, Pandas
- PHP, Laravel, Symfony, Yii, CakePHP, CodeIgniter, Phalcon, PHPUnit
- WordPress, Shopify, Drupal, Joomla, Magento
- Ruby, Ruby on Rails, RSpec
- HTML5, CSS, Tailwind CSS, Styled-Components, Bootstrap
- TensorFlow, PyTorch, Keras, AI/ML, OpenCV
- MySQL, MSSQL, PostgreSQL, MongoDB, Firebase, Firestore, AWS DynamoDB
- PayPal, Stripe, Google Pay, Square
- API Integrations (here.com, shipengine, TForce, etc.)
- TDD, BDD, DDD

**Tools & Platforms:**
- Firebase, AWS (Lambda, EC2, S3), Heroku, GCP, OpenAI, ChatGPT
- GitHub, GitLab, Bitbucket
- Trello, Jira, Asana, Monday.com

### Work Experience
**Senior Full Stack Engineer**
Upwork | Fredericksburg, VA | Nov 2019 – Present
[Upwork Profile](https://www.upwork.com/freelancers/derekotieno)

**Full Stack Engineer**
Fuzzie | Singapore | Apr 2016 – Apr 2023
Managed full-stack web/mobile development lifecycle.
[Fuzzie Website](https://fuzzie.com.sg)

**Full Stack Mobile Developer**
Gaiam Inc | Apr 2017 – Jan 2022
- [iOS App](https://apps.apple.com/us/app/gaia-studio-classes-and-poses/id567767430)
- [Google Play](https://play.google.com/store/apps/details?id=com.gaiam.ogastudio)

**Sr. .NET Developer**
CMHWorks | Purcellville, VA | Jul 2014 – Jun 2015
Full-stack role with Angular, Nest.js, AWS, and ASP.NET C#.

### Education
**M.S. in Computer Science**
Virginia Commonwealth University | Richmond, VA

**B.A. in Chemistry & Mathematics**
Cheney University of Pennsylvania | Cheney, PA

### Certifications
- Java SE6 Certified Programmer Professional
- JEE5 Web Component Developer Certified Professional

### Assessments (Indeed)
- **Software Developer Skills** – Proficient (Mar 2023)
- **Attention to Detail** – Proficient (Mar 2023)
- **Software Developer Fit** – Proficient (Mar 2023)

### Language
- English – Fluent

**Willing to relocate to:** VA, NY
**US Work Authorization:** Yes

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