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**Who I Am
AI Engineer specializing in LLM-powered applications and agentic AI systems.
Strong background in multi-agent AI, intelligent automation, and cross-industry AI deployments.
**What I Build
1. Agentic AI Systems
2. Multi-Agent AI Platforms
3. LLM Integrations
4. Custom AI Agents
**Tech Stack & Skills
Languages: Python, JavaScript (Node.js), TypeScript
Frameworks: LangChain
Cloud & Deployment: AWS, Azure, GCP, Docker
Databases: PostgreSQL, MongoDB
Other: API development, prompt engineering, RAG
**Full Stack Development:**
**Mobile App Development** (Native/Cross-Platform iOS/Android Apps)
**Technologies / Languages I can work with are:**
JavaScript Frameworks: Angular Node React Nuxt Next Nest Vue & other..
TypeScript
Full Stack / Mean Stack / Mern Stack / .Net FullStack
.NET Core
Flutter
DevOps
Generative AI
AI ML LLM
UI UX Design - Figma, Adobe XD, Photoshop
WordPress
AWS / Azure / Heroku
Native App Development
Cross platform Applications
Server Management
Hosting / Deployment
Database Management (MySQL, Postgres, MongoDB)
Git, Jest, MaterialUI
Infra: Terraform, AWS, Kubernetes, Docker, Github Actions, Jenkins, CircleCI TDD
-->> 10+ years of experience in Development / Providing Customized Generative AI powered Solutions / Consultations work and have worked for everything from small business to unicorn startup.
**WHAT I AM LOOKING FOR**
Opportunity to collaborate with startups who are in search of a partner to build their ideas; with enterprises to transform their operations into impact-full solutions.
I am an experienced software engineer, excellent in Web, Mobile and Desktop Application Development using technologies like React, React Native, .NET Framework, NodeJS, Electron, Angular, Ionic Framework, NestJS, NextJS, PHP, PostgreSQL, MS SQL, MongoDB, Firebase and others. I have experience working with Figma Designs, Adobe XD, Adobe PhotoShop and Adobe Illustrator. I can create and deploy web, mobile (IOS and Android) and desktop applications seamlessly.
With over a decade of experience in full-stack development, I specialize in **Ruby on Rails, custom eCommerce solutions** (Spree, Solidus), **ReactJS**, and **DevOps**. My expertise spans designing and developing scalable, distributed cloud-based applications with a strong foundation in **database architecture** and **system refactoring**.
As a technology leader, I’ve successfully delivered complex, high-impact projects across industries including **Real Estate, Finance, Healthcare, Marketing**, and **eCommerce**. My portfolio includes building sophisticated eCommerce marketplaces, **SaaS platforms**, and multi-channel selling applications. I am passionate about crafting innovative, robust software solutions tailored to meet diverse business needs.
**Key Expertise:**
- **Backend:** Ruby on Rails, building and scaling RESTful APIs.
- **Frontend:** ReactJS, JavaScript, responsive UIs with Tailwind CSS, and Bootstrap.
- **eCommerce Solutions:** Spree, Solidus, custom marketplaces, multi-tenant SaaS platforms.
- **Database Architecture:** MySQL, PostgreSQL, MongoDB, Redis, Cassandra, optimized for high performance and scalability.
- **DevOps:** CI/CD pipelines (CircleCI, AWS Pipeline), containerization (Docker), cloud platforms (AWS, GCP, Heroku, DigitalOcean).
- **Test-Driven Development:** Expertise in TDD using RSpec, ensuring high code quality and maintainability.
In addition to my technical expertise, I have a strong commitment to **open-source contributions** and have developed multiple **Ruby/Rails/Spree extensions**. I also bring a wealth of experience in **refactoring legacy code bases**, implementing **performance optimisation**, and improving **scalability** and **security**.
My passion lies in helping businesses unlock their full potential through technology, and I am always eager to collaborate on long-term, impactful projects.
Let’s build the future, one line of code at a time.
Best regards,
Rahul Singh
I’m a senior mobile + backend engineer with 20+ years in software (PHP since 2002; professional since 2005) and 10+ years building mobile apps. I help teams ship and stabilize real products—especially apps that are “almost done” but stuck on crashes, performance, flaky networking, or release blockers.
What I can help you with (fast, practical):
• iOS (Swift, SwiftUI, UIKit): crash fixes, performance/memory, concurrency issues, architecture cleanup
• Flutter (iOS/Android/macOS): reliability, state consistency, networking/retry behavior, release readiness
• Backend stability (PHP/Laravel or custom, Python/Django, Rails): idempotency, queues, DB performance, webhook safety
• Firebase + mobile reliability: Auth/Firestore rules, Cloud Functions patterns, analytics/instrumentation
• Monetization + shipping: RevenueCat/IAP reliability, App Store Connect/Play Console, CI/CD, rejection handling
Recent work includes taking a messy iOS codebase (CakeClub) to production-ready with a Firebase Cloud Functions v2 backend, stronger security patterns, CI/release automation, and RevenueCat integration; and delivering major cross-platform Flutter work (BillBlaster) including design refinements, admin tooling, and push notification features.
If you come with logs/screenshots (Crashlytics traces, network errors, repro steps), I’ll give you a clear diagnosis and a prioritized fix plan—and if it makes sense, I can execute the fixes as a focused sprint.
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.
I have 10 years of experience as a developer and devops.
I like sharing my knowledge with people and guiding them to success, and I will be happy to help you with my expertise.
AI Systems Architect, GTME, CSA, SRE, and Fractional CTO helping organizations leverage custom AI, autonomous agents, and cloud infrastructure to build products faster, automate operations, and scale efficiently.
Expert in custom AI model development, fine-tuning, RAG implementations, multi-agent systems, AI-powered workflow automation, LLM integration, cloud architecture, cybersecurity, and high-availability SaaS operations.
With decades of hands-on engineering experience and deep expertise in modern AI tooling, I bridge the gap between traditional software engineering and next-generation AI systems. I build production-ready AI solutions that deliver measurable business outcomes—not demos, prototypes, or hype.
From custom AI platforms and autonomous agent ecosystems to cloud-native SaaS infrastructure and mission-critical production environments, I help organizations deploy secure, scalable systems that create immediate operational leverage.
Extensive NDA obligations limit what I can publicly share, but my experience spans startups, growth-stage companies, enterprise organizations, and large-scale SaaS platforms operating under demanding uptime, privacy, and security requirements.
I am a versatile DevOps Engineer/SRE with a strong Linux background and over 8 years of hands-on experience supporting, automating, and optimizing mission-critical workloads, in both on-prem and cloud environments, leveraging DevOps processes and tools to deliver value to tens of millions of customers. In the last few years, I have been working to transform organizations, driving speedy innovation and product-to-market delivery by leveraging cloud-native paradigms and techniques which include Cloud, Kubernetes, DevOps and GitOps.
Have 8+ exp in Java Development, Spring Boot, AWS , DevOps involving critical designs and algorithms. Have worked in Harman International, RSA Security.
I'm an experienced React Native developer with five years in the field, specializing in creating cross-platform mobile applications. Alongside my frontend expertise, I have strong experience as a backend engineer and MERN stack developer, allowing me to work across the full stack. I also bring DevOps experience, including Kubernetes orchestration and deployments on platforms like AWS, Digital Ocean, Google cloud and Azure. My journey has involved collaborating on diverse projects, staying updated on industry trends, and contributing to both frontend and backend development. Looking forward, I aspire to contribute to innovative projects, leveraging my full-stack and DevOps expertise to create seamless, scalable, and user-centric solutions.
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Frequently asked questions
How long do DevOps 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 DevOps 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 DevOps request on Codementor, check out our article.
How much does it cost to hire a freelance DevOps developer?
We don’t charge anything when you post a freelance hiring request for DevOps 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 DevOps developers different?
We do a comprehensive technical and communications screen of all DevOps 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 DevOps 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 DevOps 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.