Java backend developer with with 15 years of experience. I am seeking an opportunity that will allow me to contribute my skills in new environments, enhance my experience and broaden my horizons. I believe that my technical, functional and communication skills will enable me in facing the challenging career ahead.

A committed senior software developer with a broad range of technical skills and particular strength in server side programming and data analysis. Proficiency in the entire software development life cycle, including requirements analysis and project management. Worked successfully as part of global teams on various projects in the financial sector and is known to deliver high quality software. Excellent communication skills which have been essential to build up a close relationship with Quant Research, Sales and Trading. Demonstrated leadership abilities by managing a small team of junior developers and influencing the strategic direction of her global team.

Hello, I am a software developer, troubleshooter with a wide range of skills and experience. For the last 15 years, I take part in tens of projects where I used my knowledge of different software tools, libraries, and frameworks. My profile : My Overall technology stack: ✓ Primary: Rust, Java, Python, Perl ✓ Secondary: C++, JavaScript, PHP, Ruby ✓ MySQL, Postgresql, Oracle, Informix, MS SQL, SQLite, MongoDB, BerkeleyDB ✓ JQuery, YahooUI, Angular ✓ Git, Subversion, CVS, Mercurial ✓ Nginx, Apache, Lighttpd, and others. ✓ HHVM, FastCGI, Memcached, Varnish, Squid, HAProxy ✓ SSH, OpenSSL, PGP, Kerberos, Radius, ✓ WebRTC, P2P. ✓ Postfix, SPF, DKIM, DMARC. ✓ POSIX, Win32/Win64, Android, iOS, macOS ✓ Networking: TCP/IP, UDP, Firewalls, Routers, DNS (Bind9), DHCP ✓ Debian, Ubuntu, RedHat, SuSe, CentOS, ArchLinux, Vyatta, Gentoo, Knoppix, Damn Small Linux, FreeBSD, NetBSD,OpenBSD, Mac OS X; non- *nix: DOS (MS,IBM,DR,MSX), Windows from 3.0 to Windows NT(including XP-10), OS/2. ✓ XML, JSON and msgpack, TCP, UDP, HTTP, FTP, SMTP, libvlc, android, avconv (FFmpeg), FFmpeg, vlc, Wowza, evostream, ImageMagic, GD, ImgSeek, Gimp, RTMP, RTSP, HLS, DASH, MSS, HDS. ✓ My IT hobbies: 3D modeling and printing, FreeCad, CNC, Arduino, ESP32 Some of my previous projects are available on Upwork history and portfolio.

20+ years of professional experience | 12 years on Upwork | 100% 5-star client feedback | Master of Computer Science | AWS AI Certified In 20+ years of engineering, I’ve learned that a successful product isn't just about code—it’s about technical ownership. Whether you are a founder launching a new AI-driven venture or an enterprise scaling to millions of users, I provide the strategic leadership and full-stack execution required to turn a vision into a robust, secure, and scalable reality. Why work with me? Fractional CTO Leadership: I act as your technical partner, managing agile sprints, defining best practices, and ensuring your roadmap is realistic and cost-effective. Master’s Level Architecture: With a Master’s in CS, I don't just "build apps"—I design systems. From handling high-concurrency Facebook apps (1M+ users) to solving complex mathematical constraint problems (SBC Solvers), I ensure your architecture is built for the long term. AI & LLM Specialization: As an AWS AI Certified architect, I specialize in the 2025 tech stack: RAG pipelines, agentic workflows, and secure AI integrations (using Python, FastAPI, and LangChain). Core Pillars of Expertise 1. AI Development & Data Strategy I design and deploy intelligent systems using modern LLM frameworks. I focus on accuracy, cost-efficiency, and data privacy (PII/PHI redaction). Tools: RAG, Weaviate, LangChain, Supabase, n8n, OpenAI/Anthropic API. 2. Full-Stack Web & Mobile Mastery I build high-performance, cross-platform experiences. Whether it’s a web-based enterprise dashboard or a high-engagement mobile app, I ensure SEO optimization and maintainable code. Stack: Python (Django/FastAPI), Node.js, React, React Native (Expo), Angular, PHP (Laravel). 3. Infrastructure & Cloud Governance I move projects from "messy prototypes" to "enterprise-grade" production environments with high security and 99.9% uptime. Cloud: AWS (Lambda, RDS, S3), Docker, CI/CD, Firebase, PostgreSQL/MySQL. Technical Evolution (2000 – 2025) Modern (2023-Present): Generative AI, Python/FastAPI, RAG Architecture, Vector DBs, Agentic Workflows. Mobile & Frontend: React Native, Expo, React, Next.js, Angular 2+. Backend & Logic: Node.js (Express/NestJS), Laravel, PHP, Python(Django/FastAPI), Supabase, Firebase Data & Systems: PostgreSQL/TimescaleDB, MongoDB, Weaviate, MySQL, Oracle, AWS, Docker, Git. The "Five-Star" Guarantee: I have been on Upwork for 12 years with 100% positive feedback. This is because I prioritize transparency, strict documentation, and clear communication. I am available for up to 40 hours per week to take full ownership of your technical success. Ready to build? Let’s schedule a consultation to discuss your architecture.

I'm a WordPress web designer/developer with 25 years of professional experience designing and building custom websites. I have a proven track record of delivering high-quality work for a diverse range of clients, including small to medium-sized companies, non-profits, and universities. My expertise includes: - HTML, CSS, PHP, and JavaScript - Custom WordPress website and theme development - WooCommerce, Gravity Forms, Advanced Custom Fields, LearnDash - Elementor, WPBakery, Beaver Builder, Visual Composer, Block Editor (Gutenberg), Cornerstone I provide: - Ongoing maintenance and support - Reliable and responsive communication - Attention to detail - A solution for almost any website requirement

Hello, my name is Adrien Lexington and I specialize in building engaging and responsive websites for your growth focused business or startup using the Webflow CMS platform. I believe in Human-Centric Design principles and always focus my design and development process on the end user. My main objective is to create compelling, meaningful, and responsive website experiences. I have used my background in UI/UX design, Interaction Design, Motion Graphics and Animations, and Front End Development to develop a principled design system. I have found that a highly converting website experience is often best expressed through branded story telling displayed in a well structured, minimal design with plenty of white space and engaging interactions. Webflow provides a creative base to quickly iterate and revise that type of experience through its customizable CMS database and 3rd party integrations. I am a Webflow Global Community Leader and completed Webflow's expert certificate program in January 2021. I also use Semrush and Hubspot for measuring and implementing growth strategies for website conversions. Thank you for your consideration, Adrien

A senior graphic designer from the United Kingdom, based in Cambodia with ten years experience in digital and print design, covering websites, mobile apps and multiple online and print advertising platforms. BA (Hons) Graphic Design from Coventry University, UK

Hello! My name is Meinte and for the past decade I have been Leading, Developing and Conceptualizing solutions for a wide variety of Clients. I have a strong technical background with over 15 years of experience. - Strong foundation in an object orientated approach - Combined with years of experience using functional languages - NodeJS, Express, NestJS, Mongo, Redis, RabbitMQ, Kafka as backend technologies - ReactJS, VueJS and some Svelte as frontend. - But happy not using frameworks too. Hire me to think critically about: - Architecture - Sustainable Code - Long term technical strategy - Application Performance - Well Documented code - Well Tested code My role in projects is usually one which fits my highly technical background. I have specialised myself in comprehensive front-end solutions. But I do enjoy switching it up, and have worked on various backend systems in the past. In fact, I started out as a backend Java developer and have also been involved building scalable solutions using various technologies(elastic beanstalk, rabbitmq, redis, etc.). However, the past two years my main focus has been on building platforms using React on the frontend, and NodeJS on the backend. Often enough, I am not only brought into projects to deal purely with coding, but to get better insight in the nature of the problem and what the right solution would be. Not being tied into a specific technology or platform helps in deciding the correct tool for the job. With years of experience comes an understanding not only from a technical perspective, but from a user experience point of view as well, besides this there's a better understanding for requirements from the client and a good feel for what works in terms of processes and tooling used during the lifecycle of a project. The best use of my time is recognising this experience and working together with me during multiple phases of the project, not in one specific role, but having a wide perspective of the requirements of the project and knowing what it is that is exactly being solved.

✓ 13+ years of commercial software development ✓ Developed award-winning projects ✓ Full-stack developer I started in software development back in 2003 (while in school) and have worked on commercial projects since 2007. At the moment I have huge development experience, web & mobile. I can easily master new technologies if it's required. In the past I won two prestigious software development contests, organized by Samsung and VK, in spite of the platforms (Android & Tizen) were new for me. (VK is the biggest Russian social network and the 9th most visited website in the world) The contests I won required not algorithms knowledge, as usual programmer competitions. These were several weeks long contests, which require strong software architecture experience. It were complex apps which intensively use sockets, REST, long-polling and "push" to communicate with backend, where all domain model is cached in an extremely optimized SQLite database to provide the best user experience, where the model layer heavily uses multithreading and the UI is optimized to be fluent. In this short time frame, there is no room for a mistake. To develop an award-winning app you should have years of software architecture experience. Many apps I've made from scratch to release alone, or with just a small involvement of other developers, so I can estimate the impact of early stage decisions to the whole project development time. I like software architecture, and like to code. It is exciting to learn new technologies and see how these which you know evolves. Whether it's single-page applications, which are a huge step in the web frontend evolution, or it is Kotlin coroutines - which make Java platform multithreading so pleasant. I used many platforms, technologies, languages and frameworks in my life, developed frontend and backend, business apps and fun games. In some of these technologies I am an expert, others I just tried, but I think the overall development experience is much more important than knowledge of a framework or a language, it is especially true for long running projects. I am open for any interesting project, even if I'm currently isn't an expert in the project development stack. Rewards: • My team and I won a competition to develop a messenger on Tizen platform organized by Samsung ($100000 in prizes). The achievement led to an offer from Samsung to work on a VK social network mobile app for Tizen platform. • Won second place in a competition to develop an Android messaging app for VK social network with more than 300 entrants and $100000 in prizes. Platforms: Web, Android, Node.js, Java, Tizen, Flash Languages: TypeScript, Kotlin, Java, JavaScript, Python, c#, c/c++, ActionScript 2 & 3, Groovy, PHP, Lua Frameworks and technologies: Angular, Node.js, Reactive, RxJs, HTML, CSS/SCSS, SQL/SQLite, Firebase, Firestore, Gradle, WebSockets, REST, Amazon Cognito, Amazon S3, libGDX, Box2D, OpenGL, DirectX, Unity3D, PhysX, Ogre3D, jQuery, Handlebars, DI, Jasmine, Stanford NLP, spaCy, unit testing, TDD, Flash, Flex, npm, Git, SVN

Software Engineering Consultant and Tech Manager with 15 years of experience. Credited as UI Engineer of 3 Battlefield games, two products at Spotify, including the UI ads manager for 300mln MAU. As a manager, worked as Head of Front End Engineering at CloudQuery, Co-founder/CTO at 0+X, CTO at Groupon Russia and Co-founder of gaming startup. Hired more than 30 engineers in different projects during my career Passionate about user experience, collaborating with design teams and conducting user research. Equally compatible with big corporations and small dynamic startups. Main stack: React.js, TypeScript, Next.js, Node.js, CSS. Additional technical experience includes Python, Django, Go, Docker, Terraform, AWS, Objective C, Erlang and ActionScript. * Worked on Battlefield 1, Battlefield V and Battlefield 4 games at DICE/Electronic Arts (React on Frostbite, TypeScript, MobX, etc) * Worked at Spotify with a team of Machine Learning engineers,