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I am a senior full-stack & DevOps developer with a track record of maintaining distributed infrastructure, recent deep experience in large-scale data pipelines and a growing skillset and interest in applied AI/LLM integration. My recent work at an e-commerce search engine startup had me building and maintaining scrapers and a data pipeline that ingested over 10M product SKUs into an OpenSearch index, which was used for hybrid vector+lexical product search, enriched with LLM signals extracted as part of the pipeline. I've used reranking techniques like RRF to enhance relevance after retrieval, and RAG/grounding for features that answered personalized user queries with recommendations grounded in real customer reviews. My earlier work was heavily full-stack and always involved infrastructure where I often built and supported systems end-to-end, very often in context of a regulated market - with great examples like Deckard (PropTech/GovTech), Sick Children's Hospital/RareConnect (Healthcare-adjacent), and Ethoca \[now MasterCard\] (FinTech). I've also led IaC initiatives at Ethoca (Chef/Ansible, in 2016-17), and even implemented IaC from scratch for two startups - Pastel Labs (Terraform automation of AWS infrastructure for a B2B SaaS and a tutoring marketplace, in 2021), and Rilara (Pulumi for AWS infrastructure of their e-commerce product, in 2025-26). My startup experience is proven track record of working independently, but I also thrive as part of a team, with most recent example of being part of Deckard's distributed remote engineering team of 25+ people spread across the US and Australian timezones. Claude Code is part of my everyday workflow, and I am happy to consider myself a relatively-older senior developer who has successfully adapted to an AI-assisted/AI-first SDLC without compromising the quality of my work. I would be very excited to continue my journey with an opportunity in healthcare or finance, where I could apply my IaC skills while continuing to explore the world of LLM applications to improve user experience in these regulated environments. Should you have any questions about any of the background I mentioned here or on the attached resume, I would be glad to answer them in an interview at a time of your convenience. Thank you!
I am 2013 CS graduate having 10+ years of work experience in web and hybrid mobile development. My area of expertise is Full stack development with JavaScript as the primary tech stack. I work with all kinds of modern Javascript frameworks like React, Next.js, Vue, Node.js, Deno, Typescript Other technologies I work with include MySQL, Postgres, Supabase, Vercel, Docker, AWS, Ionic, Electron.js, Tauri I have experience developing Web, Hybrid mobile applications and Desktop applications My latest experience involve end to end feature development with AI Integrations and specialization in building interfaces for AI-native applications that require high transparency, audit trails, and source attribution.
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 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.
Senior Software Engineer with 15+ years of experience working with US-based companies, specializing in React-driven frontend systems with strong Node.js backend foundations. I focus on building product-driven, scalable web applications, translating business requirements into maintainable technical solutions with clear technical trade-offs. I’ve worked end-to-end on modern web platforms, contributing to system design, performance optimization, API integrations, and architectural decisions within distributed teams. My strength lies in frontend-leaning full-stack engineering, bridging UI, backend, workflows, and infrastructure considerations without unnecessary complexity or over-engineering. More recently, I’ve been exploring AI-enabled workflows and conversational systems using OpenAI APIs, structured outputs, tool/function calling, and state-driven orchestration patterns to build reliable automation layers around LLMs. My interest is focused on practical AI integration in production systems — especially around workflow reliability, semantic interpretation, validation layers, and handling non-deterministic behavior safely. Some Specific Technologies Experience: ### React / Next.js / GraphQL Experience * I have worked on public projects like [ipsy.com](http://ipsy.com/) using Next.js, React, and GraphQL as the main stack. At IPSY, I contributed to the LATAM platform from the ground up, and also worked on the US platform within the Payments and Commerce teams, improving features and performance for a platform serving approximately 4 million users. * Strong experience building frontend architectures with React, component-driven systems, state management patterns, reusable UI libraries, and GraphQL integrations for scalable consumer-facing applications. * Experience working with distributed frontend/backend teams integrating GraphQL APIs, performance optimizations, and product-oriented development workflows. ### Node.js / Backend / Integrations * Extensive experience building backend services and integrations using Node.js, including API orchestration, authentication flows, webhook handling, and third-party platform integrations. * Experience integrating external systems such as HubSpot, Twilio, and other SaaS APIs to support workflow automation, CRM synchronization, communication systems, and operational tooling. * Familiarity with event-driven architectures, asynchronous processing patterns, and backend orchestration for scalable web applications. ### Fintech / Python Experience * Fintech industry experience developing loan checkout processes and reusable UI systems using Vite integrated as a library within Next.js applications, leveraging both server-side and client-side rendering patterns to improve performance, scalability, and security. * Experience working with Python-based backend workflows and integrations in fintech-related environments, including API communication, data processing, and automation-oriented services. * Comfortable working across mixed Node.js + Python environments depending on infrastructure and business requirements. ### VTEX / E-Commerce Experience * Experience developing and maintaining e-commerce platforms using React and Node.js within VTEX ecosystems. * Worked on storefront customization, checkout experiences, reusable commerce components, and integrations with external commerce-related services and APIs. * Familiarity with performance optimization and scalable frontend architecture for high-traffic e-commerce environments. ### OpenAI / AI Workflow Experience * Experience integrating OpenAI APIs into backend workflows using structured outputs and function/tool calling patterns. * Building state-aware conversational workflows where LLMs are used as semantic interpretation layers rather than uncontrolled chat systems. * Familiarity with handling probabilistic model behavior through deterministic validation layers, fallback flows, and orchestration logic. * Exploring event-driven AI architectures integrating APIs, webhooks, queues, and workflow state management for production-oriented automation systems. ### Supabase * Experience working with Supabase authentication and relational database features for projects in the pharmaceutical and education industries. * Strong familiarity with relational database systems including PostgreSQL and MySQL, covering schema design, queries, and backend integration patterns. ### Firebase * Experience using Firebase Authentication, primarily Google Auth integrations for authentication workflows and session management.
Experienced Full Stack & Blockchain & AI/ ML Developer with 10+ years of success building decentralized, real-time web applications and optimizing legacy systems. Specialized in EVM smart contract development, crypto payments, and Web3 integrations (Metamask, WalletConnect, Coinbase Wallet). Also Specialized in LLMs (GPT-4, LangChain, Haystack), RAG pipelines, and intelligent agent workflows. Proven track record in modernizing codebases, scaling blockchain infrastructure, and enhancing UI/UX fsor Web3 ecosystems. Adept at Solidity, Node.js, Golang, React, and cloud-native DevOps. Passionate about revolutionizing digital experiences in music, finance, and identity through blockchain..
Hello and welcome! With over 6 years of experience in web design and development, I specialize in creating captivating web templates and building scalable applications using cutting-edge technologies. From monolithic to microservices architectures, I excel in crafting intuitive user interfaces and implementing robust solutions. My expertise spans software architectural design, build automation, and deployment, ensuring seamless project execution. I have a keen eye for design and prioritize aesthetics alongside functionality, ensuring that your interfaces and pages are not only visually appealing but also user-friendly. Additionally, I'm passionate about problem-solving and meticulous in my approach, committed to delivering top-notch results that exceed expectations. With my knowledge and ability to spot good designs, you can expect nice interfaces/pages built into your apps/platforms. Let's collaborate to turn your ideas into reality with precision, attention to detail, and a dedication to excellence. Contact me at: bellohargbola13@gmail.com
14 years of professional iOS developer experience (iOS 4-26), 20+ AppStore apps, Czech Technical University graduate. Obj-C & Swift, strong in OOP patterns, Jenkins CI, Auto-Layout, Responsive Design, GIT, RESTful API's, Multithreading, In-App purchases, Push Notifications, Firebase, Parse, Backendless, Google Analytics, OneSignal, Branch.io, Fabric, Facebook SDK, Instagram, Uber, Twitter, OAuth2, Braintree Payments, Apple Pay, HealthKit, ... you name it:) When it comes to iOS development, I am your guy! Excellent English, experience in Czech, US, CA and UK startups. I'm here for you. Let's talk!
Self-taught full stack developer. Helped over thousands of clients to build their small to large scale websites. I love building high performance and scalable websites. Over the past few years, I have been heavily working on WordPress and Laravel. My top skills are: WordPress (oh, not to mention I used many popular plugins like: ACF, Gravity Forms, etc.), Laravel, MongoDB, MySQL, ElasticSearch, jQuery, Bootstrap, Redis, RETS integration, Plesk, WHM and many more! I occasionally do system admin tasks as I am managing plenty of servers running on CentOS. If you are lost in coding, need a hand or running out of ideas, feel free to reach out to me. I am not available for a full time hire but happy to help you with any kind of help you need with your projects.
IT professional with over 8 years’ management providing technology solutions to support strategic business objectives. Hands-on experience in all levels of testing, including performance, functionality, integration, regression, and user acceptance testing. Supportive and enthusiastic team player dedicated to streamlining processes and efficiently resolving project issues. Fluent in both English and Spanish with limited working proficiency in Portuguese and Beginner Chinese.
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