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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.
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'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.
I am an internationally experienced CTO, Systems Architect, Leader and Full Stack Software Engineer with 40 years experience in hands-on coding and building systems, teams and processes that scale.
For the past 7 years I have been running my own Fractional CTO agency, and focus on helping startups build and scale 1st class development teams and processes.
Recent projects/companies:
2025 Interim CTO at www.orynth.dev an AI website builder, Athens
2025 Interim CTO at [www.legalutopia.co.uk](http://www.legalutopia.co.uk/) (bankrupt Oct 25), London
2024-25 CTO at Cherny Enterprises Ltd - stealth Ai startup, Miami/London
2023-24 Frontend Lead at [www.dicer.ai](http://www.dicer.ai/), AI/MarTech startup, NYC
2022-23 Interim CTO at [www.scrolller.com](http://www.scrolller.com/), a social media startup with 10 million MAUs, NYC
2019-22 Staff Developer at [www.triplepointliquidity.com](http://www.triplepointliquidity.com/) a blockchain startup in Private Equity - NYC,
2018-19 Interim CTO at a blockchain startup (a pro-bono role), Zurich
2019 Staff Developer at [www.winnr.gg](http://www.winnr.gg/), eCom startup, Paris
[http://www.richardmcsharry.com](http://www.richardmcsharry.com/)
Stuck in a bug related to web development?
I have the skills to solve complex problems in a few minutes.
Being a Google Developer Expert for Web Technologies, Google Cloud, and Angular, I love to help developers and managers all around the globe to become better everyday.
Being a Udacity Mentor & Pluralsight coach, I understand the root problem very quickly & help you to understand it better.
Not sure? Find my Profile on the Google official website:
https://g.dev/aayush
Feel free to DM me :)
I build mobile apps from scratch, with supporting backends based on GCP/Firebase. Currently, I focus on Dart and Flutter, but I also have over 14 years of experience in JavaScript, 2+ years of React Native, and experience with Node.JS, MongoDB, and Python.
A little background
I started to code when I was 6, worked with 30+ different programming languages, and built my own called ObjectPath available in Python and Javascript. I hold BSc in computer science. I've been building commercial software since 2004 and was CTO of two startups.
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 .NET, Python, Blazor, ASP.NET Core, SQL and agentic AI architecture (LLMs, reasoning engines, Semantic Kernel, LangGraph, tool-calling agents), I design systems where performance, reliability, and intelligent automation aren't optional—they're the baseline.
I deliver AI in production, not prototypes. I’ve architected and deployed AI-powered systems across financial platforms, education and exam automation, and real estate market intelligence, including enterprise-grade solutions for organizations such as The New York Times, Project Management Institute (PMI), Walmart, Merit Wealth, Namfus and BlueberryCMS.
---
**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, chatbots
- **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.**
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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?
We don’t charge anything when you post a freelance hiring request for Bootstrap 3 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 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?
As a platform, we strive to ensure you’re always happy with your Bootstrap 3 project’s results. If you’re unsatisfied with the results, you can choose to get a refund for the project. Additionally, you can contact our support team should you need any further assistance with your project.
For more answers to frequently asked questions, see here.