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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 do it all, I do iOS (swift and Obj C) , Android (Kotlin and Java), front end (I use my own JS framework, although I know vue or react), and Node Js for my back end, I prefer MongoDB, but I can use SQL like Postgres, Been programming for nearly 20 years so I know the ups and downs. I have clone Uber, Twitter , Tinder and other major apps for clients, like "tinder for job matching between employers and candidates".
I’m a Technical Lead and Full-Stack Developer with 17+ years of experience delivering robust web applications and SaaS platforms. I have led engineering teams through complex projects, balancing hands-on development with mentoring and process improvements to consistently meet aggressive deadlines. Notably, I helped scale infrastructure and improve performance for SaaS products used by tens of thousands of users. I excel at driving feature delivery end-to-end—whether implementing APIs, optimizing workflows, or guiding teams—as a dependable executor and problem solver.
Hey there, I'm having **8+ years** of experience in **PHP server side** scripting language. **Skills:** * Back-end: PHP, CakePHP, Laravel, LAMP/LEMP stack * Front-end: Javascript, jQuery, Vue.js, Inertia.js * Database: SQL(MySQL, Postgres), Redis * Dev-Ops: Linux, Docker, Git(Gitlab, Github, Bitbucket), Supervisor * Third party APIs: Xero, Quickbooks, Slack, Stripe, [Customer.io](http://customer.io/), Twilio, Facebook API, Google API and many more * Coding Standards: PSRs, EditorConfig * Static Analysis tools: PHPStan, Psalm, SonarQube * Testing: PHPUnit, Cypress, Little bit of Python + Selenium * CI/CD: GitHub Actions, Travis, Jenkins * Error Tracking: Rollbar, Sentry * Building RESTful APIs * Data Integration solutions
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.
### Hands-on CTO | Lead Software Engineer | 15+ years I build products end to end and still write code most days. I'm the CTO at Hexis, a sports nutrition platform trusted by 40% of the professional peloton at the Tour de France and 50% of the Premier League. I joined as a senior engineer, rebuilt the core data model so multi-day queries went from several minutes to under 700ms (a key factor in closing a $2.1M seed round), moved the platform to GCP and drove our SOC 2 audit. In our CEO's words, I was instrumental in building a product that delivered a 300%+ increase in ARR and found product-market fit. Through Toptal I've worked as a lead engineer and fractional CTO. For an AI startup in financial due diligence I built an agentic RAG platform that indexed 10M+ pages and scored 100% on the Vectara RAG benchmark. I led engineering on Fashion Nova's React Native app on the Shopify Storefront API, and owned HIPAA-compliant auth, payments and audit logging for a US healthcare company. Earlier I led a team of nine at Verizon Media/RYOT on a 3D content tool used by the NFL, HuffPost and Yahoo. Before that I worked on ISSUU's backend, which served 100M+ users a month, and built the SDK and developer marketplace for Danske Bank's District platform. What I work with: TypeScript, Node.js, NestJS, React, Next.js, React Native, Python, Go, PostgreSQL, GraphQL, GCP, AWS, Docker, Kubernetes, Pulumi, Terraform, and LLM tooling like LangGraph, LangChain, LangSmith, OpenAI, Anthropic and Gemini. I use AI coding agents every day. Things you can check: * Top 1% of TypeScript engineers globally on Algora * Toptal network member (top 3% of freelance talent) * 200+ mentoring sessions on Codementor with a 5.0 rating * Top 0.1% of 500,000+ users on Interviewbit "Sachin is a real asset to any organisation." Dr David Dunne, Co-Founder and CEO, Hexis I've worked remotely since 2016, mostly with US teams on US hours. Website: sachinmour.com LinkedIn: linkedin.com/in/sachinmour GitHub: github.com/sachinmour Algora: algora.io/profile/sachinmour
**Laleet** is a seasoned software engineer with over 8 years of experience in modern web and backend development. He specializes in building, scaling, and supporting high-performance applications using **React**, **Next.js**, **Angular**, **NestJS**, and **Express.js**.
Senior data-focused polyglot software engineer. Built several business intelligence systems + predictive analytics; used NLP + machine learning for metadata enrichment, has linguistic and cultural training, built payment processing systems, used various relational SQL databases and NoSQL. Specialties: Java, Clojure, Ruby, Python, Perl, text processing, data transformation + metadata enrichment, linguistics, automation (including DevOps), pattern recognition and machine learning. Also worked on PHP, Node.js, Backbone, AngularJS, iOS apps, and several other systems
Lead Product Designer and UX leader with extensive experience designing and improving digital products across eCommerce, enterprise platforms, mobile experiences, and web applications. I work end-to-end across **user flows, wireframes, high-fidelity UI, prototypes, design systems, user research, and developer-ready handoffs**, with a strong focus on identifying workflow gaps, missing states, inconsistent patterns, and usability risks before they reach development. My experience combines hands-on product design with design leadership. I’ve built and managed scalable design systems, led and mentored design teams, partnered closely with product and engineering, and supported implementation to ensure the final experience matches both user and business needs. I’m particularly effective in complex products that need structure and refinement—turning incomplete requirements or existing designs into cohesive, accessible, scalable experiences that teams can confidently build.
Energetic software engineer with 12+ years experience developing robust code for high-volume businesses. Prolific, full stack developer with a passion for metrics and beating former "best-yets." Prototyped 25 new product features per year for Elegant Inc. Increased code-efficiency of Versatile Solutions customer portal by 55%. Boosted customer retention by 25%. Spearheaded a team that won the 2016 Talent Award for cloud computing. An enthusiastic team player and deep creative thinker. At Oz Online, slashed costs by 32% in 6 months by implementing Tools and Processes training across all departments. Cut stockroom waste by 65% with a new Kanban system. Skilled in Continuous Improvement, Agile & Scrum Implementation and Business Process Improvement. Met 150% of revenue goal in fast-paced tech firm. Led 9 cross-functional teams to 25% efficiency improvement and $1.2M cost savings.
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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 E-commerce 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 E-commerce request on Codementor, check out our article.
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We do a comprehensive technical and communications screen of all E-commerce 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 E-commerce developers’ user satisfaction rates.
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