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Top freelance Bootstrap 3 developers available to hire
⏱ MY WORK HOURS : 7AM to 11 PM INDIAN STANDARD TIME . 16 HOURS A DAY :)
I’m a senior full-stack developer with 19+ years of real-world experience delivering scalable web and mobile solutions across industries. I work end-to-end—from architecture and development to optimization, security, and deployment.
💻 Web Technologies
PYTHON , CORE JAVA , ASP.NET
PHP Ecosystem: WordPress, Magento, Shopify, OpenCart, Joomla, OsCommerce
Frameworks: Laravel, CakePHP, CodeIgniter, Yii
Frontend: JavaScript, Angular, React
Backend: Node.js, Python (Flask, Django)
📱 Mobile & Cross-Platform
React Native
FlutterFlow
API-driven mobile app backends
🤖 Advanced Skills
AI & third-party API integrations
Payment gateway integrations
SEO, speed optimization & performance tuning
Malware removal & security hardening
VB Macros & automation solutions
⚡ Strengths: Fast delivery, clear communication, production-ready solutions
👥 Team Support: Backed by a 10-member team (2 designers + 8 developers) for large-scale and long-term projects
I don’t just write code—I solve problems, mentor developers, and deliver results. If you need reliable guidance or hands-on execution across web, mobile, or AI-powered systems, I’m here to help.
Faster delivery and 24/7 communication are my greatest plus.
Hi, my name is Gabriel, I'm a Front End Developer and a Graphic Designer, I work mainly in Web Design, using Front End Technologies like HTML5, CSS3 (SCSS) and Javascript.
I'm familiar with Javascript frameworks as jQuery and ReactJs.
I'm a Google Tag Manager expert, I can do custom Javascript variables and triggers, I also can implement pixels and events for Facebook, AdWords, etc.
I have been working as a Front End Developer for 5 years and as a Freelance Graphic Designer for more than 10 years.
I love to learn and teach what I know, understanding students struggle as I am a self-taught student myself.
Understanding concepts as a graphic designer, makes me help people who want their designed websites in Photoshop, Illustrator or Adobe XD come to life in HTML, CSS, and Javascript.
I **define the architecture**. For 21 years, I've been the person CTOs and lead developers call when systems fail under load, migrations are at risk, or AI integration needs to work right the first time.
With expertise in **C#, .NET, Blazor, ASP.NET Core, SQL, Python,** and production AI agents (**Semantic Kernel, LangGraph, custom tool-calling**), I design systems where performance, reliability, and intelligent automation aren't optional—they're the baseline.
I've shipped AI to **production** — not to a Jupyter notebook. I'm the creator of **FreeAIVoice** — a live AI voice platform with AI Voice Generation, Voice Cloning, and Speech-to-Text across **30+ spoken languages** and a developer API. I provided production systems for The New York Times.
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**Here's where I'm most useful to you:**
- **The AI Integration Trap** — You've been asked to add AI to your existing .NET system but don't know whether to use *Semantic Kernel*, raw OpenAI APIs, or a Python sidecar. I've made that decision dozens of times. I'll make it faster and safer for you.
- **The Blazor Bottleneck** — Your Blazor app is slow, state management is tangled, and you're unsure if you chose *Server or WASM* incorrectly. I can diagnose what went wrong and map a clean path forward — often in a single session.
- **The Legacy Modernization Cliff** — You have a 10-year-old .NET system that needs AI or modern tooling but wasn't designed for it. I specialize in *incremental refactoring paths* that don't require a full rewrite and don't break what's already working.
---
**What I Do Best:**
- **Software Architecture & System Design** — scalable, maintainable systems from greenfield to enterprise
- **AI Agent Development** — production-grade agents with Semantic Kernel, LangGraph & AutoGen — *not demos*
- **Blazor & ASP.NET Core** — Server, WASM, hybrid — full-cycle development and performance tuning
- **Python & AI Automation** — RAG pipelines, workflow automation, voice AI, LLM integrations
- **Legacy .NET Modernization** — refactoring strategy, migration paths, incremental upgrades
- **Architecture Audits** — identifying structural risk before it becomes a production incident, not after
- **Debugging Complex Systems** — when the stack trace doesn't tell the whole story
**If any of this sounds like your current situation — DM me. I respond to every message.**
Technical cofounder, board member, and seasoned operator with experience building and growing early stage companies (pre-seed to late Series), large scale government and commercial projects, and nonprofits.
Senior Java Developer with over 17 years of experience building scalable enterprise applications, with strong focus on backend systems, REST APIs, and distributed architecture. Hands-on expertise in Java (up to 21), Sprng , Spring Boot, React ,Angular , TypeScript ,Oracle DB,PostgreSQL, and microservices. Proven track record in insurance and finance tech domains. Comfortable working in agile environments, and highly skilled in transforming business requirements into technical solutions.
I started my career as a web developer 16 years ago. I like challenges where I can use my skills to develop outstanding web applications in look, performance, and efficiency. I am specialized in Front-End and back-end web technologies. For more details about technologies I know, see the expertise section below.
I can help you with:
• New projects or features
• Front-End/Back-End development
• Mentoring
• UX/UI Design
• Bug fixes and issue resolving
If I missed something you need help with, please drop me a message and I will look for a solution.
**AI, AWS, Cloudformation, Security & Terraform expert with 15 zero-downtime migrations under his belt.**
**Executive Summary**
Experienced Engineering Manager & Fractional Executive with a robust background in cloud architecture, agile methodologies, artificial intelligence, automation & security. Adept at leading engineering teams (and teams of AI agents) to deliver high-quality software solutions, optimizing system performance, and fostering a culture of continuous improvement. Expert in scalable multi-application cloud based reliability engineering, debugging, security and uptime management.
**Personal Description**
"I have been writing code since age 4, networking since age 12 and server administration since age 15. I am not only a coniseur, but also a master artist, of code in any language.
I have always worked alone, and striven for perfection, but never quite got there. AI has changed that and I am now achieving not just perfection, but absolute masterpieces in 1/10 or less time than I ever thought possible.
As a polymath, I've always been on or near the bleeding edge of technology, staying agile and adapable, rarely repeating stacks from project to project, always using the best tool for the purpose.
The advancement in agentive AI over the past 6 months, when properly utilzed in experienced and demanding hands such as myself, basically turns me into a team of 20...with unlimited knowledge and zero time required to learn new APIs/toolkits/etc."
\- Jason
With 15 years of extensive experience as a full-stack developer, I specialize in developing robust web portals. My expertise spans across a wide range of open-source PHP platforms, including WordPress, OpenCart, OsCommerce, Shopify, Magento, and Joomla, as well as advanced PHP frameworks such as CakePHP, Laravel, CodeIgniter, and Yii. In addition to backend and frontend development, I offer specialized services in SEO, malware removal, and performance optimization.
My proficiency extends to modern JavaScript technologies like Node.js and React, reinforcing my capabilities in full-stack development. I pride myself on delivering high-quality solutions efficiently, with a commitment to round-the-clock communication to ensure client satisfaction.
Supporting my work is a dedicated team of 10 professionals, including 2 designers and 8 coders, enabling us to handle large-scale web development projects with agility and precision.
I've been a computer nerd since I taught myself QBasic and C++ at the age of 13. I am detail-oriented, thorough, and passionate about clean, elegant, efficient code, and using it to solve interesting and useful problems. I have 15+ years of professional experience in web application development, and mobile app development experience as well.
I am an expert Data Engineer having 10 years of experience with exposure on in-house, hybrid & AWS, GCP cloud services. I hold **Data Architect Nanodegree from Udacity**. My Primary skills include -
- Languages - Python, PHP, Ruby, Javascript, HTML, CSS
- Packages - PySpark, Pandas, Numpy, Flask, Jquery, Bokeh
- Tools - Spark, Hadoop, Hive, Mysql, Postgres, Airflow
- File Formats - json, csv, txt, Parquet
- GCP - Cloud functions, DataProc, Bigquery, GCS
- AWS - Lambda functions, API Gateway, Athena, Cloudwatch, Glue, DataBrew, Kinesis, S3, Redshift, Redshift Spectrum, SNS, SQS
I mostly worked on developing, maintaining, optimising ETL/Data pipelines, used variety of tools & process during pipeline execution. Apart from building pipelines i holds good hands on building custom scripts or solutions.
I am a quick learner & having positive mindset which helps me to tackle a complex problem in easy way. During my experience i optimised numerous pipelines where improved time by ~70% & saved cost with magnitude of 10th part.
If you are looking for any help in learning, solving complex data problem, you are at right place. I am happy to help here.
Thanks.
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Frequently asked questions
How long do Bootstrap 3 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 Bootstrap 3 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 Bootstrap 3 request on Codementor, check out our article.
How much does it cost to hire a freelance Bootstrap 3 developer?
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What makes Codementor Bootstrap 3 developers different?
We do a comprehensive technical and communications screen of all Bootstrap 3 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 Bootstrap 3 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.