HOT TOPIC: CLS (Cumulative Layout Shift) - (0 unresolved cases), LCP (Largest Contentful Paint), INP and FID improvements (Google Web Vitals). Detail-oriented specialist. Florida International University's Alumni. Data-driven decisions. Google Analytics, Google Tag Manager, and Google Ads Certified Expert. Success is built on trust. Trust starts with transparency. My mission is to help you to achieve value through performance optimization of web products, whether that means pushing you to the front of your industry, earning you greater profits as a market leader, or assisting you to realize long-standing projects and plans. Experience in travel&transportation-related projects for 10 years. My services: - Custom software development. PHP, JS, iOS, and Android developers.
 - IT consulting. I love startups. I assist them in tech consulting and starting projects from scratch. - Website performance optimization. 10 years experience, 30+ successful businesses. - Broken links are highly productive fixers.

Kenneth Okereke is a UX Designer and UX Engineer with a master’s degree in Computer Science from Pace University. He blends deep user experience design skills with frontend development expertise to build intuitive, scalable applications across web and mobile platforms. Kenneth designs and engineers user-centered solutions for enterprise dashboards and mobile apps using tools like Figma, React, and TypeScript. His recent roles combine design and development, from wireframes and interaction flows to implementing components in production code. He has also contributed to projects at companies like Aetna and xtraCHEF, helping teams modernize outdated systems into responsive, user-friendly experiences. With experience in HTML5, CSS, React Native, and cloud-native tools like AWS and CI/CD, Kenneth works at the intersection of design systems and engineering performance. His work focuses on accessibility, scalability, and creating solutions grounded in real user needs. Whether leading UX for a design system or building reusable UI components, he is committed to delivering high-quality products that balance form and function. Kenneth’s goal is to continue growing in roles that allow him to combine design thinking with frontend engineering to create innovative and impactful user experiences.

Software Engineer - AI Products & Evaluation Software engineer who builds the measurement layer for systems that resist testing. Ten years spanning LLM evaluation and agent products, manufacturing test frameworks, and industrial process control. Currently the first engineering hire at an AI developer-tools startup, where I built the offline evaluation harness and cost attribution infrastructure behind an agentic PR review product.

Rapid system prototyping with off the shelf prototyping boards can be accomplished in a short period of time. Having a diverse background in embedded development and IoT, I can provide services based on years of experience with embedded systems in harsh user environments (bus transportation industry, cell phones, hobby grade R/C vehicles, sensors, and medical devices). I am familiar and have used prototyping and breakout boards from many companies including Arduino, Adafruit, Raytac, Microchip, Sparkfun, Nordic nRF52 product line, Digi XBEE3 Cellular, Bosch (IMU), and others. When necessary, custom prototyping PCBs are created with PCB CAD tools. More than three years as lead engineer implementing both hardware and firmware of cellular NB/IoT systems using Digi XBEE3 technology resulted in launch of more than 100 systems now active in the bus transportation industry. Technologies in the product use solar charging, lithium iron batteries, low power implementation, MicroPython programming, watch dog timing, Bluetooth LE control, smart battery management, cellular NB/IoT, and much more. I have excellent knowledge and experience in Software Development Life Cycle (SDLC) and Agile Methodologies. I am flexible to project demands and shifting technologies and requirements. Having a diverse background in embedded development, I can provide services based on years of experience with embedded systems in harsh user environments (cell phones, hobby grade R/C vehicles, sensors, and medical devices). Embedded technologies include concurrent use of pulse width modulation (PWM), analog to digital converters (ADC), digital to analog converters (DAC), Bluetooth LE (BLE), collection algorithms, control algorithms, motion sensing, temperature sensors, light sensors, and much more. I have a BS degree in Engineering with over 25 hours of graduate courses in CS at Johns Hopkins University. I have both designed and managed development of numerous embedded systems including voice (audio) systems for the US Air Force, Motorola Pagers, NEC cell phones, Samsung GSM/GPRS smart phones, and hobby grade (very advanced) radio control vehicles at Traxxas. At Traxxas, receiving seven accepted patents, I provided hands on development and team management for all of the embedded hardware/firmware radio control technologies including spread spectrum radio control links, sensors (GPS, accelerometer, temperature, RPM, etc.), BLE link to iOS/Android phones with several awarded patents and additional patent applications still in process. Rapid development of a medical blue light sensor for an Upwork client connected to an Android App I also developed was completed in 4 weeks with a working prototype demonstratable to investors and end users. Development of a wearable 9DOF high precision motion sensor for an UpWork client illustrates my capabilities for embedded system development, PCB design, and embedded C programming. Thank you and I look forward to working with your company in the very near future. Best regards, Gary DeWitt

AI Development / LLMs / Agents Development Hey guys, I am Volodymyr - Python and Nodejs Software Engineer 👋 My expertise lies in both frontend and backend development, utilizing modern frameworks and tools to deliver high-quality solutions Services: 🔹Discovery Phase 🔹POC / MVP development 🔹Web development 🔹AI/ML solutions 🔹Support and Maintenance Why Work With Me? 🔷 Honesty & Transparency – I believe trust is the foundation of a successful long-term partnership. Clear communication and integrity are my top priorities. 🔷 Thorough Discovery Process – Before starting any project, I conduct an in-depth analysis to ensure a full understanding of your goals and deliverables. 🔷 Security & Quality Standards – I follow industry-standard security practices and rigorous quality assurance processes throughout development. 🔷 Expert Insights & Best Practices – With years of experience, I analyze the market and business objectives to provide a well-rounded, strategic approach tailored to your project. 🔸Technologies: • JavaScript, TypeScript • MERN, Node, Express, Nest, Next • React, Redux • Langchain, Pinecone, ChromaDB • GPT 4o, GPT o1, GPT o3, OpenAI, LLaMA, Google Bard, T5, Roberta.. • DALL-E, MidJourney, Stable Diffusion, Hugging Face • YOLO, Faster R-CNN, Mask R-CNN • DeepSpeech, Jasper, Kaldi, XLNet, T5, ERNIE • ChatGPT integration • Socket.io • Amazon Connect, AWS, EC2, S3, Lambda, DynamoDB • Firebase, Google Filestore • MySql, PostgreSQL, MongoDB, MariaDB, Redis • Kafka • OpenAI API, Stripe API, Paypal API, Google Maps API, Mapbox API • Docker __________ Other keywords to find me: Software development, web development, mobile development, senior developer, CTO, chief technical, technical officer, team-leader, team-lead, lead developer, PWA, User Interface, User Experience, Mock-up, Web, Server, Desktop, Android, iOS, iPhone, Application, Usability, Website, Responsive, Adaptive, Website Prototyping, Wireframe, Update, IT, agile, kanban, scrum.

Hi! My name is Eunice and I'm a software developer by day during Mondays to Fridays, mainly specialising in mobile app development. I joined Upwork in search of any freelance work - in return, my goal is to deliver the requirements set out, while in return I am looking to professionally enhance my freelance portfolio on the side.. I am currently based in Melbourne, Victoria, Australia. Skills and experience: I have over 3 years or experience as of software developer, and I also have previous experience(s) in consultancy and dealing with external clients. For app development, I mainly dabble with Swift/SwiftUI for iOS-based apps, and I have intermediate (WIP) experience with Kotlin and Jetpack Compose for Android applications. Apart from my job and finding work as a freelance developer, I like to cook and find comfort and tranquility outdoors. 🍃 :) I look forward to working with you, and doing my utmost best! :D

I specialize in developing high-quality iOS and Android applications, with over a decade of experience in crafting consumer apps across productivity, finance, social, gaming, and lifestyle categories. As the founder of Beyond Confident Labs LLC, I have successfully designed and launched 12+ apps on both the Apple App Store and Google Play. My expertise in Swift, Xcode, and Python allows me to create intuitive user interfaces paired with powerful functionality. One of my standout projects, ProsperPro, is a personal finance tracker that exemplifies my 'vibe coding' approach, merging user-centric design with robust financial tools. I thrive on turning innovative ideas into functional products that resonate with real users. If you're looking for a developer who combines creativity with technical skill to bring your app vision to life, let’s connect and discuss how we can collaborate. I am a self-taught iOS and Android developer with over a decade of hands-on experience designing, building, and shipping consumer apps. I am the founder of Beyond Confident Labs LLC. I am proficient in Swift, Xcode, Python, and modern app development workflows.

I am a skilled Flutter developer with expertise in building high-performance, cross-platform mobile applications and web applications. With a strong foundation in Dart and a passion for crafting intuitive user interfaces, I specialize in creating responsive and visually appealing apps for Android and iOS. My experience includes integrating Firebase for backend services, implementing state management solutions, and optimizing app performance for seamless user experiences. I am dedicated to staying updated with the latest Flutter advancements and enjoy collaborating with teams to deliver innovative and scalable solutions.

I am a full-stack software engineer with 13 years of experience creating impactful products that simplify lives. My expertise spans mobile development with React Native, Kotlin, and Swift, as well as web development using React, Node.js, and MongoDB. I have a strong focus on UI/UX engineering, crafting seamless user experiences, and building tools that empower teams to be more efficient. My work includes diverse industries such as field service, gaming, and financial systems. I have a proven ability to lead projects from conception to deployment, ensuring high-quality outcomes. I also bring leadership skills from coaching girls wrestling, where I instilled values of perseverance and teamwork. If you're looking for a seasoned engineer who can bridge technical excellence with user-centered design, let's discuss how I can contribute to your project.

Full Stack AI Developer | LLM, GenAI, SaaS | Python, Next.js I am a Senior Full Stack AI Developer with more than 10 years of experience. I build production-ready AI applications, SaaS platforms, and automation systems using Python, Next.js, LLMs, and GenAI. My Main Skills: AI & GenAI: LLMs, OpenAI, automation, smart AI features Backend: Python, FastAPI, Node.js Frontend: Next.js, React, TypeScript, Tailwind CSS Databases: PostgreSQL, MongoDB, Redis, MySQL Cloud: AWS, Docker, Vercel. Full Stack AI Developer | LLM, GenAI, SaaS | Python, Next.js I am a Senior Full Stack AI Developer with more than 5 years of experience. I build production-ready AI applications, SaaS platforms, and automation systems using Python, Next.js, LLMs, and GenAI. I help startups and businesses launch AI-powered products faster. I also fix and improve existing systems so they can grow without major problems. I create clean, reliable solutions that work well in real use. In the past, I've helped clients: -Build and launch full SaaS platforms with scalable, multi-tenant architecture -Integrate AI/LLMs into production systems -Fix unstable systems before they became expensive rebuilds -Design backend systems that support long-term growth What I focus on: *Scalable Node.js & SaaS architecture *AI/LLM apps (OpenAI, automation workflows) *Full product builds (auth, billing, dashboards, APIs) *React / Next.js frontends My Main Skills: AI & GenAI: LLMs, OpenAI, automation, smart AI features Backend: Python, FastAPI, Node.js Frontend: Next.js, React, TypeScript, Tailwind CSS Databases: PostgreSQL, MongoDB, Redis, MySQL Cloud: AWS, Docker, Vercel -I think about the best way to build your product for long-term success. I communicate clearly and give regular updates. I am a good match if you want to: Build a new AI SaaS product Add LLM or GenAI features to your platform Grow or improve your current system Work with a senior developer who cares about quality Work Terms -Strictly follows Upwork guidelines policies. -More than 30 hours per week. The timezone is flexible. -Hourly is preferred, Fixed is also fine. I'll help you design the cleanest, fastest path forward. Send me a message with what you're building, I'll tell you exactly what I'd improve or change before you commit further.