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Top freelance Testing developers available to hire
Seasoned Web Developer and Blockchain enthusiast with a proven track record in the IT and services industry. Expertise in Research, PHP, HTML, JavaScript, and Blockchain development, including Smart Contracts. Skilled in automation, application testing, and cybersecurity analysis for web and mobile apps.
I have a great passion for solving problems and can help people with various programming languages, databases, information systems, software related projects.
Tech Lead and Mentor with ten years of experience in various domains and tech stacks following the industry's best practices, architecture, testing, code reviews, debugging, profiling, and CI/CD pipelines.
**I have something special for you - let's discover:**
- Student discount is applied automatically.
- Displayed rate is not pocket friendly - no worries - I have something special for you.
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**Highlights:**
- Mentoring is one of my passions, and I have helped numerous mentees on their journey to become successful developers in various fields such as web, native mobile, and cross-platform development.
- I have helped many developers to fix critical bugs and implement complex features on the platform.
- Proficient in working with teams on software development life cycle(SDLC) from requirement gathering or planning, defining, designing technical architecture, building or developing, testing, deploying, and maintaining applications
- Well verse with development process/tools like Github Actions, CircleCI, CodeMagic, Fastlane, Jenkins, BuddyBuild, Git workflow, Github workflow, Agile PM tools, Continuous integration, and continuous deployment(CI & CD), Test/Domain-driven development with keeping healthy test code coverage, etc.
- Proficient in creating and working with different kinds of APIs - REST / GraphQL
- Proficient in working with databases SQL and NoSQL
- Proficient in object-oriented design, data structures, problem-solving, complexity analysis, and debugging.
- Proficient in writing efficient, maintainable, reusable, testable code that preserves privacy and security.
- Proficient with different platform/services integrations
- Right knowledge of toolset and libraries for effective and productive work.
I’m Michael Ayoub, a Solution Architect and Innovation Leader with over 15 years of experience delivering complex, scalable, and secure technology solutions across fintech, banking, aviation, and enterprise platforms. I specialize in digital transformation, payment systems, enterprise architecture (TOGAF), and product development, with hands-on leadership across B2B, B2C, and microfinance ecosystems. Having held senior roles in companies like Sharjah Airport, Banque Misr, Fawry, and CashCall, I bridge business goals with cutting-edge technology, driving innovation, operational efficiency, and regulatory compliance. Passionate about aligning IT strategy with business value, I thrive in dynamic, cross-functional environments and continuously explore emerging tech to fuel growth and competitive advantage.
I have experience in Python for more than 10+ years. I have been using Python in Embedded systems. I have experience in Making Test setup for various Embedded device for automation testing.
I'm a **Senior Software Engineer with 10+ years of experience** designing, building, and deploying production applications, APIs, SaaS platforms, and AI-powered products.
I specialize in **full-stack development, AI agents, and LLM-powered applications**, combining years of hands-on software engineering experience with modern AI technologies.
I'm an active software engineer who also enjoys helping other developers. Although I'm no longer mentoring full-time, I'm available for occasional **1-on-1 coding sessions, debugging, architecture guidance, and code reviews**.
### 🤖 AI Engineering & Agents
- **LLMs:** OpenAI, Anthropic Claude, Google Gemini, Groq, AWS Bedrock, and local models (Ollama, LLaMA)
- **AI Frameworks:** Vercel AI SDK, Google ADK, LangChain, CrewAI, AutoGen
- **AI Agents:** Tool/function calling, MCP (Model Context Protocol), multi-agent systems, autonomous workflows
- **Voice AI:** LiveKit, real-time voice agents, telephony integration, browser-based voice calls
- **RAG & Knowledge Bases:** Vector search, embeddings, MongoDB Atlas Vector Search, retrieval pipelines
- **LLM Engineering:** Prompt engineering, structured outputs, evaluations (evals), testing, observability, and reliability
### 🚀 Full-Stack Software Development
- **JavaScript & TypeScript:** React, Next.js, React Native, Expo, Astro
- **Backend:** Node.js, Express, Fastify, REST APIs, GraphQL
- **Python:** FastAPI, Flask, automation, API development
- **Databases:** MongoDB, PostgreSQL, Redis
- **Frontend:** HTML, CSS, SCSS, Tailwind CSS
- **Testing:** Playwright, Vitest, Jest
### ☁️ Cloud, DevOps & Infrastructure
- **Cloud Platforms:** AWS, Google Cloud, Vercel, Cloudflare, DigitalOcean
- **Linux & Containers:** Ubuntu, Debian, Docker, Bash
- **Serverless:** AWS Lambda, Cloudflare Workers, Vercel Functions
- **CI/CD & Monitoring:** GitHub Actions, Jenkins, Sentry, New Relic
### 💡 How I Can Help
Whether you're debugging a React application, building a backend API, integrating an LLM, developing an AI voice agent, or planning the architecture of a new product, I can help you work through the challenges.
I bring **real-world engineering experience** to mentoring sessions, focusing on practical solutions, clean architecture, and understanding the trade-offs behind technical decisions.
I have also spent years teaching and mentoring developers, helping beginners and experienced engineers improve their skills and confidence.
❤️ **Open source enthusiast:** [github.com/gianpaj](https://github.com/gianpaj)
**Stuck on a problem or need a second opinion?** Click **Let's Chat** and tell me what you're working on.
Senior data engineer specializing in financial data infrastructure, large-scale pipeline architecture, and cloud data systems on AWS/GCP/Snowflake.
I build and fix data pipelines that handle real stakes — regulatory reporting, trading infrastructure, high-volume financial data — and I have a track record of measurable improvements: full data loads from 3 weeks to 6 hours, ingest times from 45 minutes to 3, query runtimes improved 500%.
Recent work:
🏦 Lead data engineer at MSRB (US federal regulator, $4T municipal bond market): 30 ETL pipelines supporting $9B+ in daily trades, pricing data availability increased 800% across 2.7M securities
📦 Data infrastructure at Trafigura: serverless pipelines processing ~500GB of multi-domain financial, industrial, and geopolitical data
📑 Greenfield SEC filing pipeline: 20 years of filings across 4,000+ companies, structured for LLM querying
⚙️ DataPraxis: container-based ingestion platform (GCE/Docker/Kubernetes) reducing ingest time from 45 minutes to 3
🌍 Catalist: Productionizing machine learning models at 1,000,000x scale and implemented Cloudera colocation -> BigQuery transtion
MS Applied Mathematics & Statistics, Johns Hopkins University.
Full-stack software craftsman and technical leader with over 15 years of experience. Equally adept at system design, programming, technical leadership, mentorship, and business collaboration. Have a wide breadth of technical experience, but specialize in backend API development, relational databases, and web applications. Passionate about simplicity and efficiency.
I have worked at over a dozen companies large and small, in a handful of different domains. Also participated in hundreds of interviews, about half-and-half as the interviewer and the interviewee. I have given dozens of talks and training sessions on a variety of topics, mostly focusing on distributed systems, caching, and testing.
My top skills are Java, SQL, testing, and refactoring.
I have experience with formal academic and professional mentorship, and would love to help you skill up, solve a problem, or just nerd out with you today!
I'm a senior fullstack JS developer. I am a team player and I love to learn new things and share my experience.
I have been working as a developer since 2009, mostly as a front-end.
Some of the things that I've made:
* Static webpages (freelance).
* Working as a support and developer engineer working closely with Customer Support team.
* Developing a new CRM to replace Salesforce in MercadoLibre (biggest e-commerce latam company)
* Developing a new UI Library in Wenance to share components between company apps.
I have +10 years of experience in HTML/CSS, Js, React and nodeJS
Hi! I'm Experienced Full-Stack Web Developer (Angular, React, Javascript, NodeJs), Use my powers to turn your dreams into reality. I learned to program making websites from scratch with HTML, CSS, Javascript, React, Redux, Angular, NodeJs, Express and MongoDB.
MERN stack (MongoDB, Express, ReactJS, and NodeJS).
MEAN stack (MongoDB, Express, AngularJs, and NodeJS).
Wordpress (Custom Themes, Modifications, Performance... )
This means that you can ask me for help on anything related to Javascript, HTML, CSS (and SCSS/Sass of course), responsive/mobile websites, usability an so on.
With 9 years of experience developing software, I always advocate for the best available solutions and the cleanest code. I also love to explain how and why the code works so you can also learn more from it.
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Frequently asked questions
How long do Testing projects normally take?
The length of a project depends on many factors, including the scope of your project and the technical complexity of it. When you post a freelance Testing project request on Codementor, you’ll have the option to indicate when you’d expect the project to be completed. We suggest chatting with the interested developers to ensure both sides are on the same page. For more information on how to post a freelance Testing request on Codementor, check out our article.
How much does it cost to hire a freelance Testing developer?
We don’t charge anything when you post a freelance hiring request for Testing developers! You’ll have the chance to determine what the budget for your project is when you post the request. You’ll only need to pay the developer if you’re 100% satisfied with their work. Please know that Codementor charges a small service fee when a developer completes the job.
What makes Codementor Testing developers different?
We do a comprehensive technical and communications screen of all Testing developers at Codementor. Our network includes book authors, popular open source contributors, top Stack Overflow users and engineers at top tech companies. In addition, to continually ensure the quality of our freelancers, we regularly check in on existing Testing developers’ user satisfaction rates.
What happens if I’m not happy with the freelancer’s work?
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For more answers to frequently asked questions, see here.