I'm Adrian Roșian, a seasoned software consultant with over 16 years of experience, specializing in code review, due diligence, and project planning. With a background in computer and military science, I've developed custom solutions using PHP, Python, JavaScript but did not shy away from more exotic languages such as Haskell, Clojure and Scala. I have worked for projects of all size in travel and banking. Why Hire Me? 1. 👨🏻‍💻 Code Review: I thoroughly analyze your software architecture, code, and data to ensure top-notch quality, security, and compliance. 2. 🕵🏻 Due Diligence: I evaluate your software, processes, and teams to provide a clear picture of your current setup and what improvements are needed. 3. 📊 Planning: Got a groundbreaking idea? I assess feasibility, brainstorm the best tech stack, and help set up your technical team. I can even serve as an interim CTO! My leadership experience has a say here. Professional Background: As a Freelance Web Developer since 2009, I've created custom web solutions using technologies like PHP, Python, and JavaScript, but i also enjoy Haskell, Clojure and Go. I've built everything from eCommerce payment plugins to private jet booking systems. At WhiteCity Code, I lead teams to develop innovative solutions that enhance business operations. My teaching experience at Babes Bolyai University keeps me on the cutting edge of computer science. Why Trust Me? With a strong academic background in computer and military science, I bring a diverse skill set in development and project management. I've led successful projects like merchant acquisition portals and file encryption tools. Beyond my technical expertise, I value building strong, collaborative relationships with my clients. I'm here to understand your unique needs and tailor my services to help you succeed. Let's work together to make your IT project a success! Best regards, Adrian Roșian

Linux, C, C++, Clojure, AWS, PostgreSQL, MySQL, MongoDB, DynamoDB, ElasticSearch, Data Pipelines, Docker, Infrastructure Architecture, GraphQL, Deployment, Monitoring and Maintenance I’m a Software Engineer with great Infrastructure background. I know how to build things quickly and cost-effectively even in a cloud. Last projects: - Actimobile.com - VPN: Principal Engineer - Palta.com - Co-Founding Company: Backend & Infra Architect - wanna.fashion - Virtual Try On solutions: Backend & Infra Architect - gojuno.com: Juno - Ride Sharing Service: Infrastructure Architect - iron.io - IronWorker, IronMQ, IronCache: Infrastructure Engineer - wargaming.net - World Of Tanks: Infrastructure Engineer

I am an ambitious and strategic-thinking Leading Software Engineer and Feature Lead with 10+ years of global experience in managing software development and project architecture, adept at building impactful tools and managing services. In the USA, UK, and European markets. *Skills* Proficient in software development using Clojure, Golang, Python, NodeJS, Elixir and others. Experienced in test-driven development methodologies. Well-versed in working with cloud platforms such as Google Cloud Platform and AWS. Skilled in testing and maintenance of software systems. Capable of effectively understanding and addressing client requirements. Proficient in managing build releases. Experienced in team oversight and collaboration. Competent in front-end development utilizing JavaScript, TypeScript, and ClojureScript. Strong ability to work in cross-functional teams. Tech stack agnostic, adaptable to different technologies and frameworks. Demonstrated strong learning skills, quickly acquiring new knowledge and staying updated with the latest industry trends.

I help founders and businesses turn ideas into working software. My focus is building maintainable web applications, SaaS products, internal tools, dashboards, and business platforms from concept through deployment. I work across both frontend and backend, with a strong emphasis on architecture, clarity, and long-term maintainability. Typical projects include: • SaaS MVPs and startup products • CRM and business management systems • Dashboards and administration portals • AI-assisted applications and workflows • API integrations and automation systems • Custom internal business tools My primary stack includes Vue.js, Node.js, Express, PostgreSQL, and modern web technologies, but I choose tools based on project requirements rather than preference alone. What clients usually value most is my ability to think beyond implementation details. I don’t just build screens: I help structure systems, clarify requirements, identify risks early, and make practical technical decisions that support future growth. Whether you need a complete MVP, a new feature, backend architecture, or help stabilizing an existing product, I aim to deliver software that remains understandable, maintainable, and useful long after the initial launch. If you have an idea you’re trying to turn into a real product, feel free to reach out.

Your AI prototype works in a notebook. Making it survive production (async queues, retry logic, latency budgets, real users), - that's where I come in. Backend: - Production-ready APIs (FastAPI, Django, Flask) - Database design and performance tuning (PostgreSQL, Supabase) - Secure authentication, roles, and permissions - Refactoring unstable or experimental AI-heavy codebase - Dockerized deployments and cloud readiness AI and LLM systems - LLM-powered automation - Custom AI agents and assistants (LangChain) - Optimizing AI pipelines for latency, reliability, and cost - Hardening AI features for production use Automation and AI Workflows - AI-driven workflow orchestration (human-in-the-loop, fallback logic) - End-to-end automation using n8n, Zapier, Make - Connecting AI systems to internal services and third-party APIs My tech stack: Claude Code (yes, I use it a lot to save time and be productive!), Python, FastAPI, Django, Flask, PostgreSQL, Supabase, Docker, Git, LangChain, Kubernetes, GCP, Azure. My recent production projects: • AI Support Ticket Processing System Built an end-to-end backend for an AI system that automates ticket routing and resolution. Focused on latency optimization and building reliable fallback mechanisms so the LLM doesn't hallucinate critical client data. (Tech: FastAPI, LLMs, PostgreSQL) • Back-end developer at a Czech fintech company (Fair Play). Developed and shipped critical features in a high-stakes environment on GCP/Kubernetes. Improved test coverage from 60% to 92%, reduced deployment failures by 80%, and optimized services to handle peak loads with zero downtime. Result: Faster feature releases and enhanced system reliability in a compliance-heavy industry. • Part-time Python back-end developer in a foreign company Glasswall Solutions. Worked on unit tests, bug fixes and project features. We were using Azure as our cloud service provider. Dealt with Paramiko Python library. • Custom CRM development at Hyperbach company This is an internal CRM / HRM platform. It includes 3rd-party API integrations, REST API development, and DB management. It is being written from scratch in Python, Flask, Alembic, PostgreSQL, Docker, Vue.js. Delivered a robust internal tool that automated HR processes, saving the team 20+ hours/week in manual work and scaling to support 500+ users seamlessly. • Custom FastAPI backend for SaaS business I designed and implemented a production-grade FastAPI backend for a mid-size internal SaaS tool used by a distributed team. The project required a clean, scalable architecture capable of supporting multiple user roles, growing feature sets, and third-party integrations. The backend was built using an asynchronous, modular structure, allowing the system to handle high loads and remain maintainable as new features are added over time. If you have an AI prototype that needs to become a real product or you need a solid backend built from scratch, let's talk.

I'm a full-stack developer with 10 years of experience building production web and mobile applications from concept to scale. My technical stack spans Python, Node.js, JavaScript, React, Flask, and Clojure/ClojureScript. I specialize in architecting and deploying AI-powered SaaS applications that integrate machine learning models (PyTorch, TensorFlow) with modern web frameworks. I've built end-to-end solutions that seamlessly connect React frontends, RESTful/GraphQL APIs, and intelligent backends powered by ML services like Amazon Lex, Textract, Google Dialogflow, and Cloud Vision. I excel at turning business ideas into production-ready applications quickly without sacrificing quality. My cloud infrastructure experience includes AWS, GCP, and Azure, where I've deployed and scaled applications using Docker, Kubernetes, AWS Beanstalk, and serverless architectures. I work comfortably across the entire stack—from designing database schemas (SQL/NoSQL) to optimizing cloud performance and ensuring high availability. Whether it's building a multi-tenant SaaS platform, integrating AI workflows into user-facing products, or scaling systems to handle growth, I deliver robust, efficient solutions with a startup mindset: move fast, own outcomes, and build for the long term.

Experienced Software Engineer with over a decade in backend development, including more than four years leading teams of up to 10 members. Specializes in building scalable systems within FinTech and E-Commerce, with expertise in API integrations and performance optimizations.

I build high-impact software platforms that scale — from robust APIs and chatbots to cloud-native solutions serving millions. With 6+ years in fullstack and backend engineering, I specialize in JavaScript, Node.js, TypeScript, Next.js, React, AI Agentic Development (using Claude Code, Cursor, Codex, Copiloto, N8N and other tools) and modern cloud technologies (AWS, Azure, Docker, Kubernetes, Supabase, Render, Vercel, Lovable). My experience spans fintech giants like Nubank and fast-paced startups, where I’ve led teams to deliver mission-critical products. Highlights: - Led chatbot development at Skeps, enhancing engagement for 5M+ users and slashing process times by 20%. - Developed APIs at Nubank supporting 100M+ customers, ensuring high availability and scalability. - Passionate about DevOps, automation, and mentoring teams to achieve more together. Technical Stack: JavaScript, TypeScript, Node.js, Next.js, React, Vue, Angular, SQL, MongoDB, Flutter, Clojure, Kubernetes, AWS, Azure, Docker, Supabase, Vercel, Cursor. I thrive in dynamic environments where innovation and impact go hand in hand. If you’re looking for a leader who can bridge business goals and technical execution, let’s connect.

I help startups and SaaS teams build fast, scalable web applications. If you're dealing with slow APIs, messy backend code, or need a reliable developer to build things properly from day one — I can help. 🔶SENIOR FULL-STACK SOFTWARE ENGINEER 🔶Experience: 8+ YEARS 🔶SPECIALIZATION: 🔹 Delivering enterprise-grade web applications. 🔹High-performance platforms using the MERN and MEAN stacks (Node.js, React, Angular, Express). 🔹High-concurrency backend development using GOLANG and ELIXIR (PHOENIX). 🔹Data-heavy applications that require flawless performance, real-time capabilities, and microservices architecture. With advanced capabilities in AI/ML integration and IoT, I ensure your applications are not just functional, but future-proof. I have successfully architected systems handling millions of users, focusing on complex queries, indexing, caching, and rock-solid security. CORE COMPETENCIES & SERVICES: 🔸 High-Volume Web Apps: Complete end-to-end development of Single Page Applications (SPAs) and complex web platforms using MERN and MEAN stacks. 🔸 High-Concurrency Backend Systems: Architecting highly scalable, fault-tolerant backend systems using Golang and Elixir/Erlang (OTP). 🔸 API & Integrations: Building and consuming robust RESTful and GraphQL APIs, alongside complex third-party integrations (Stripe, PayPal, Segment). 🔸 AI/ML & Data Science: Integrating Artificial Intelligence and Machine Learning models (NLP, Computer Vision, Chatbots, Big Data Analytics) directly into your web applications using Python, TensorFlow, and PyTorch. 🔸 Architecture & DevOps: Implementing CI/CD pipelines, Docker, Kubernetes, AWS infrastructure, and IoT Core backends (via MQTT). 🔸 Team Leadership: Capable of working independently, integrating seamlessly into existing teams, or leading and managing a development team for your project. TECHNICAL STACK: 🔹 Front-End: JavaScript, TypeScript, React.js, Angular.js, Vue.js, HTML5, CSS3, Tailwind CSS, Bootstrap. 🔹 Back-End (Primary): Node.js, Express.js. 🔹 Back-End (High-Concurrency): Golang, Elixir (Phoenix, Ecto, Absinthe). 🔹 Databases: PostgreSQL, MongoDB, MySQL, Redis. 🔹 AI / Data Science: Python, TensorFlow, PyTorch, Pandas, Scikit-Learn. 🔹 Infrastructure & Tools: AWS, Docker, Kubernetes, Git, CI/CD, OAuth 2.0, WebSockets. CLIENT-FRIENDLY PRACTICES I GUARANTEE: 🔸 Open Communication: I prioritize frequent updates, prompt responses, and transparent progress reports. 🔸 Strict Confidentiality: fully willing to sign an NDA before we begin discussions. 🔸 Total Ownership: All deliverables, source code, and related assets belong exclusively to you from day one. 🔸 Clean, Maintainable Code: I adhere strictly to TDD (Test-Driven Development), common design patterns, and industry best practices to ensure your codebase is scalable and easy to maintain long after the project ends. I am an excellent fit if you lack technical expertise and need a developer who can take full ownership of the architecture, or if you are simply tired of sifting through inexperienced developers and want it done right the first time. MY DEVELOPMENT PROCESS To ensure a seamless, stress-free experience, I follow a strict, battle-tested workflow for every project: 1. Architecture & Discovery: Before writing a single line of code, we define the exact scope, map out the database schema (PostgreSQL/MongoDB), and select the optimal stack (MERN, Golang, or Elixir) tailored strictly to your scalability needs. 2. Agile Execution: You will never be left in the dark. I provide transparent updates through agile sprints, so you always know exactly what is being built and tested. 3. Robust QA & Automated Testing: I heavily utilize Test-Driven Development (TDD) and CI/CD pipelines. This ensures every new feature is rigorously tested and deployed without breaking your existing system. FREQUENTLY ASKED QUESTIONS 🔹Can you rescue or optimize an existing codebase? Absolutely. 🔹How do we handle timezone differences? I maintain flexible working hours, deliberately overlapping with your timezone to ensure we have windows for real-time communication. Keywords: MERN Stack Developer, MEAN Stack Developer, Node.js Developer, React.js Developer, Angular.js Developer, Express.js, Full Stack Web Developer, Frontend Engineer, Backend Developer (Golang), Go Engineer, Golang Engineer, Golang Architect, Full Stack Developer, Web Developer, Software Engineer, Node.js Developer, Senior Node.js Developer, MEAN Stack, MEAN Stack Developer, Senior MEAN Stack Developer, MERN Stack Developer, AI Integration, Full Stack Elixir Developer, Golang, Go Developer, Backend Developer, Backend Engineer, Full Stack Developer, Software Engineer, Microservices, API Development, REST API, System Design, Distributed Systems, High Performance Systems, Low Latency Systems, Concurrency, GCP, Google Cloud Platform, AWS, Cloud Functions, Docker, Linux, CI/CD, Node.js, NestJS, Elixir, Phoenix LiveView, PostgreSQL, SQL, Supabase.

I will help you to analyse and accomplish your project even when hope is lost. Very good in electronics embedded system designs, arduino, backend web development system networking and interconnections, computer software and hardware repairs, Electrical installations and mentainance.