I’m a Senior Software Developer with over 10 years of professional experience specializing in full-stack web and mobile application development. Throughout my career, I have designed and developed scalable, high-performance applications using modern technologies across frontend, backend, cloud infrastructure, and mobile platforms. My expertise includes building responsive web applications with React, Next.js, Vue.js, TypeScript, and Tailwind CSS, as well as developing backend systems using Node.js, NestJS, PHP, Laravel, Python, and RESTful APIs. In addition to web development, I have experience creating cross-platform mobile applications using React Native and Flutter, delivering seamless user experiences for both iOS and Android platforms. I am highly skilled in database architecture and cloud services, including PostgreSQL, MongoDB, Firebase, Supabase, AWS, and Docker-based deployments. I have worked on various projects such as SaaS platforms, AI-powered applications, e-commerce systems, booking platforms, automation tools, and real-time communication systems. I also have hands-on experience integrating third-party services like Stripe, Twilio, OpenAI APIs, and payment gateways while maintaining secure and scalable architectures. As a developer, I focus on writing clean, maintainable, and optimized code while collaborating effectively with cross-functional teams in agile environments. I am passionate about solving complex technical challenges, improving user experience, and continuously learning modern technologies to build innovative digital products.

Top Rated · 100% Job Success · $14K+ earned on Upwork. I build AI systems that survive real users, not just demos. Most AI projects die somewhere between the prototype and production. The agent works in a notebook, then falls apart on real data, real latency, and real edge cases. My work is the boring part that makes AI actually ship: integration with your existing systems, retrieval that doesn't hallucinate, and evaluation that proves the thing works before your customers find out it doesn't. Recent results: Built a production pricing agent that monitors 6,000+ products and reprices against competitors in real time Designed a RAG system that lets non-technical users query BigQuery in plain English, with grounded and source-cited answers Fine-tuned RoBERTa for buying-intent detection and raised accuracy from 92% to 97% in a live agent pipeline Currently building enterprise search, product discovery chatbots, and multi-agent systems on an enterprise RAG platform, including batch evaluation across competing agent architectures What I build: AI Integration. Connecting LLMs and agents into your actual stack: CRMs, databases (BigQuery, Supabase), internal tools, and workflows. I use n8n where it fits and custom Python where it doesn't. RAG and knowledge chatbots. Hybrid search, reranking, metadata filtering, hallucination mitigation, and proper evaluation. Built for accuracy on your documents, not generic answers. Production AI agents. Multi-agent orchestration with LangGraph, LangChain, and Google's ADK, with guardrails and human review steps where the stakes require it. How I work: I will tell you honestly when something is over-engineered, when a simple workflow beats an agent, and what the failure modes are before we build anything. I scope in phases so you see working software early instead of waiting months for a big reveal. Ten years in engineering, GCP-certified ML background (Vertex AI, GKE), and full-stack skills when needed (Next.js, TypeScript). I also have supporting depth in computer vision (YOLOv11 pipelines at roughly 90% precision) and MLOps. Best fit: teams that need their AI to be reliable. E-commerce, SaaS, and any business where a wrong answer costs money. Message me with what you're trying to automate or build and I'll give you a straight read on the right approach.

You should work with me if you need someone who can turn ambitious AI, mobile, or consumer product ideas into real software. I’m Hassan Uriostegui, a Principal Software Engineer and product builder with 10+ years of experience building AI-powered consumer platforms, mobile apps, video products, real-time systems, and cross-platform architectures. Before Instagram had video, I helped bring professional video effects to mobile through Viddy, a platform that reached tens of millions of users and a $300M valuation. Later, I co-founded FlyrTV, a video creation platform that raised $6M+ and was acquired by Pond5. Since then, I’ve led engineering across high-growth consumer and AI products, including AI game creation, AI companions, 3D avatars, messaging platforms, and real-time interactive experiences. Most recently, I served as Principal Engineer at Jabali AI, where I led product and engineering architecture for FriendJam, an AI-powered platform that lets users create, remix, chat with, and play mobile games from simple text prompts. I built cross-platform systems across Web, iOS, and Android, designed real-time AI game generation infrastructure, and helped increase monetization 4x in two weeks. I can help you with: AI product development Mobile apps in Swift, SwiftUI, UIKit Web apps with React, TypeScript, JavaScript Backend systems with Python, Flask, Node.js, REST, WebSockets OpenAI, Gemini, Claude, AI agents, prompt systems RevenueCat, AppsFlyer, Mixpanel, Sentry, OneSignal MVPs, product architecture, monetization, and scalable engineering foundations I bring a rare combination of hands-on engineering, product judgment, startup execution, and zero-to-one experience. My goal is simple: help you build something that works, scales, and creates real business value.

I’m a Bubble developer with over 6 years of experience building complete systems and applications, from early-stage MVPs to mature platforms used in production. My work focuses on designing clean data structures, reliable workflows, and scalable logic. I’ve built systems that handle complex business rules, large datasets, multi-role access, dashboards, automations, and integrations with external services. Throughout my career, I’ve worked on a wide range of products, including internal tools, client portals, financial systems, service and booking platforms, and AI-assisted applications. These projects required careful attention to data consistency, performance, and user experience, even when the underlying logic was complex. I also have solid experience integrating third-party APIs and AI services into Bubble applications. I approach integrations in a structured and practical way, ensuring outputs are predictable, editable, and well connected to the rest of the system rather than treated as a black box. I often work closely with founders and product owners, helping not only with implementation, but also with technical decisions, scope definition, and identifying architectural risks early. I value clear communication, transparency, and building systems that are easy to maintain and evolve over time. If you’re looking for someone who can take ownership of building and improving a system, not just executing isolated tasks, I’d be happy to talk.

I'm a professional developer with the Unity development engine. I've been using the engine since 2007, when I taught myself the engine to such a degree I paid my way through college by selling tutorials for the engine. (My old website for those is unity-tutorials.com, sadly now out-of-date) Starting in 2011, I began doing professional consulting and work-for-hire making games and software for smaller companies and individuals. Those projects ranged from a simple storybook app for iOS to the official software edition for "The Farming Game," a classic board game. I've also created more abstract apps like an educational program that tracks learning progress for middle-schoolers, a nuclear warhead damage simulator for a charity, and the 3D visualizer for Acupuncture of the ear (Auriculo). Since then I've worked full-time in multiple jobs including at Williams Interactive as an engineer creating slot machines, at Keystone Games as a lead programmer making computer games and fixing existing ones (I optimized and rebalanced the recent release of Rogue Islands over two weeks, for example), and at my current job with Level Ex, Inc. I'm fully capable to create any number of game systems and I'm skilled working solo or as part of a group. I also have extensive contacts with sub-contractors, so I'm able to take on much larger projects if needed. Thank you for your interest and I look forward to working with you!

!!!! FREE DISASTER RECOVERY ANALYSIS!!!! !!!! Delivering SaaS solutions by using a cloud platform and Cloud Application Integration !!!!! !!!!ZOHO ONE PARTNER-IMPLEMENTED 100+ COMPLEX ZOHO CREATOR PROJECTS!!!! !!!! FREE FREE free ZOHO ONE, CREATOR Consulting free FREE FREE !!!!!! !!! SaaS SaaS SaaS SaaS SaaS - CLOUD APPLICATION INTEGRATION - 100 % SUCCESS !!!! Working on ZOHO CRM and CRM-based application implementation, recently completed three complex applications. Core expertise: 1. Working with client and accept the challenge to deliver quality solution 2. Work with team member and guide them to right direction 3. Quality solution for complex issues 4. CRM based application development Career Summary: Senior Software Developer with 24 years of experience in high availability platform in Telecom domain. Strong ability to work on Operating System, Database and Telco Application Development in C, C++ on Unix/Linux Platform. Strong knowledge of Object-Oriented Software Engineering Methodologies with experience in executing from Requirements, Design, Development, Peer Review, Configuration Management and Testing to Post-Deployment Maintenance phase. Technical Skills Languages: C++, C, XML,DBMS, SQL Server, Tcl/Tk, Shell, Python Web Technologies: JSP, HTML/CSS, Javascript, Ajax Databases: MySql, Oracle TimesTen 6.0/7.0, PostgreSQL Tools/Applications: Eclipse, Putty, WinSCP, mdb, gdb, ClearCase, GIT, CVS, IPFilter, SSH Tunnel, VPN Operating Systems: Windows, Unix (Solaris), Linux (Ubuntu, RedHat, Debian), Chorus ( First Object Oriented OS and most part written in C++ ) Development Methodologies: Agile/Scrum, SDLC Cloud Platform: VICI, OpenStack Device Driver: SCSI Device Driver, SCSI Mirror Device Driver File System: SXFS (Non corruptible FS) Senior software consultant HP Enterprise Aug-2015-Oct-2015 HSS product feature development: Contractor for Hewlett-Packard Development Company. Became familiar 3GPP telecom standards for Home Subscriber Server. Reviewed and commented on Feature Requirement Specifications for new Diameter interface feature that would allow for authentication and authorization of telecom clients in a roaming architecture. Worked on STa feature on STR/ASR/RAR command and Watcher module in C++ according to telecom RFC standards. Tortoise SVN source control software and Eclipse IDE were used. Wireshark network analyzer used for debugging and testing. Language : C++ Tools : SIMULAP, Jmeter Protocol : Diameter Traffic and network analyzer : Wireshark Operating System : Tandem NSK OS Interface : STa, SWx Senior Software Engineer as Area Prime HCL and Alcatel Lucent, ALU Plano, TX Aug-2014-July-2015 Transitioned to HCL in August 2014, onsite at ALU, Plano-TX, ensuring aggressive KT (knowledge transfer) goals are met while still providing all deliverables to customer. Selected to perform remote training by webinars and conference calls. Working as area prime and coordinating field issue with team, providing fixes for critical lab and client issue. Language used C, C++, shell scripting Senior Software Staff. Alcatel-Lucent. Plano,TX 2006-2014 Area prime for DB and performance group in NGN platform to implement feature for WCS_5060. Drove individuals to continuously improve to deliver quality software. Analyzed issues, coordinated with team, resolved critical issues in timely manner. Analyzed multiple releases database and provided database migration and platform upgrade tools. InServiceUpgrade module implementation Platform upgrade module: Used two partition table to keep active and inactive OS and switch to new partition table during upgrade. Participated in initial Operating System (Linux and Solaris) upgrade strategy and implementation. Resolved internal and external clients on critical issues in timely and in efficient manner. Worked on performance monitoring software module. Worked on billing software modules. Were managing all aspects of TimesTen (Oracle) database, including architecting database for application module and reviewing application implementation. Extensive experience in developing Distributed and Multi-threaded applications using Database applications (Oracle/TimeTen) with C++ Language used C, C++, shell scripting Senior Software Engineer Alcatel, Plano, TX 1998-2005 Led high available system framework team for Alcatel CrossConnect products. System Initialization Module Configure Solaris Disk Suite System Installation and Upgrade Module SXFS (Non corruptible FS), SCSI driver enhancement, System Initialization Software,OS specific device driver and utilities. Collaborating & coordinating with Technical and QA Leads to ensure requirements are addressed in Technical Design and Development (i.e. traceability) and Alternative Design strategy for delivering Value Added solutions.

I specialize in creating robust, secure solutions specifically designed for your business idea, helping you validate it and find product-market fit or pivot effectively if needed. Proven experience in SaaS, Ecommerce, PropTech, and EdTech. I prefer to take ownership and deliver results precisely and on the agreed schedule. I'm a full-stack engineer with an M.Sc. and over 14 years of experience in designing, developing, and analyzing data-heavy applications, with a recent focus on integrating AI capabilities. My clients value my ability to anticipate and solve problems, offering various solutions. I am skilled in supporting individuals and teams throughout the development process. I specialize in: - Full-stack development for Web, Progressive Web Apps, Back-ends for mobile apps - AI integration to the Web and Mobile apps - AI Chat Bots, RAG based on Langchain - RESTful and GraphQL APIs and API integrations - Libraries and Middlewares - ETL Pipelines and Web Scraping; - Database designing - Performance optimizations - Problem solving and bugs fixing I am most efficient in using the following stack and technologies; however, my experience and ability to learn extend far beyond these: - Languages: Javascript/Typescript, Python - Generative AI: Custom GPTs, TextToImage, ImageToImage, TTS, Voice cloning, Langchain - Frameworks: Nodejs, React, Nextjs, Vuejs, Angular - Technologies: REST, GraphQL, PWA - UI Libraries: MUI, Bootstrap, TailwindCSS - Databases: NoSQL with MongoDB and DynamoDB; SQL including MySQL and PostgreSQL - Testing: Jest, Mocha, Chai - Caching: Redis - Deployment and infrastructure: Docker, Amazon Web Services, Terraform, DigitalOcean, Supabase, Vercel, k8s My wide full stack experience and analytical mindset gives me an ability to analyze complex problems and break them down into manageable and straightforward steps. In my work, I prioritize thoroughly analyzing requirements. I believe that success depends on having clear goals. I'm specifically good at creating technical requirements and specifications, anticipating problems, and balancing quality with the speed of development. Choose me, and you'll gain a partner fully dedicated to bringing your vision and product to life.

I develop innovative apps for Apple platforms, specializing in iOS, iPadOS, watchOS, tvOS, and CarPlay. With over 10 years of experience, I create high-quality applications that millions trust and enjoy. My expertise includes Swift, SwiftUI, and Core Data, allowing me to build seamless user experiences and efficient backends using Python and FastAPI. I focus on clean architecture and robust testing using modern methodologies to ensure reliable and maintainable code. If you need a developer who can take your app ideas from concept to deployment while delivering exceptional performance and user engagement, let’s connect. I look forward to collaborating and making your vision a reality.

I’m a Senior Product Designer with 7+ years of experience helping startups, SaaS companies, and AI-driven businesses design products that are intuitive, scalable, and ready for growth. With 6,000+ hours delivered on Upwork, I’ve partnered with founders and product teams to transform complex ideas into digital experiences that users genuinely enjoy. My work goes beyond creating attractive interfaces. I focus on understanding business goals, simplifying complex workflows, and designing products that are easy to use, efficient to build, and scalable as companies grow. I specialize in AI-native products, enterprise SaaS platforms, dashboards, mobile applications, and modern web experiences. By combining strong product thinking with AI-augmented design workflows, I help teams move faster while maintaining quality, consistency, and usability. Selected Impact: ✅ Led UX for an AI-powered Cloud FinOps platform managing over $2B in AWS spend, helping enterprise customers achieve 50%+ cloud cost savings. ✅ Designed product experiences that contributed to 48% reductions in cloud infrastructure costs while improving operational efficiency by 80+ hours per month. ✅ Built and scaled comprehensive design systems that improved consistency, accelerated product development, and simplified collaboration between design and engineering teams. ✅ Designed 50+ SaaS platforms, AI products, dashboards, CRM systems, and mobile applications across healthcare, fintech, logistics, sports, developer tools, and enterprise software. What You Can Expect: ✔ Product-first thinking that balances user needs with business objectives. ✔ Clear, scalable interface design that simplifies complex workflows. ✔ Developer-friendly Figma files with organized components, variables, Auto Layout, and design systems. ✔ Fast, collaborative communication throughout the project. ✔ Thoughtful problem solving that identifies opportunities beyond the original brief. I enjoy working with founders and product teams who are building ambitious products. Whether you’re starting from an idea, refining an MVP, or improving an established platform, I bring structure, clarity, and strategic thinking to every stage of the design process. Services I offer: → Product UI/UX Design (SaaS, web apps, dashboards) → Mobile App Design (iOS & Android) → UX Audits & Usability Improvements → User Flows, Wireframes & Prototyping → Design Systems & Scalable UI Libraries → Developer-Ready Figma Files (Framer & Webflow support) If you’re looking for a product designer who combines strategy, usability, and execution to build products that scale, I’d be happy to discuss your project and explore how I can help.

I am a Software Engineer with a MS in Computer Science and 20 years of expertise as a programmer and exclusively dedicated to Unreal Engine since 2015. I have perfect understanding of Unreal Engine's core, creating Plugins, modifying the engine, translating blueprints into C++, converting projects from Unity (or any other engine) to Unreal and vice-versa and creating tailored base projects as well as providing my services thorough the full development cycle. I specialize in C++, Blueprints, Online Gaming, Editor Plugins, AI, Physics, Mechanics, Rendering, Materials, Level Design, ArchViz, Film, Television, Broadcast, Live Events, VR, AR, and any tailored product that can be done with Unreal. Everything while using the best Software Engineer methodologies, Game Design Patterns and Practices. Architect of Multiple Metaverses and MMOs. SERVICES: Game Programming Game Design Game Mechanics Full Games Base Projects Online Multiplayer Dedicated Servers MMO and MOBA Metaverse Engine Migration Physics Custom Rendering Performance 3D modeling and animation Training Whether you are starting with a rough concept, already have extensive specifications or a finished project, I will work with you to turn your needs into a reality. I can learn your codebase quickly, fix bugs, refactor messy code, and add new features as needed to, providing maintenance or upgrades on your existing project. I work promptly, designing strong solutions and writing clean and professional code. I can also learn and adapt efficiently to new challenges. Bilingual fluency in both English and Spanish. I am a fast, responsive, honest, fully dedicated, self-motivated, self-taught and reliable person. Your satisfaction is my number one priority. All Services Delivered with: - Game Design and mechanics with the best practices - Development of clean, efficient and customized code - Consult of goals and/or strategy - Customer service and full support; handle customer bug reports or complaints and feedback with the most positive attitude I am looking forward to hearing from you!