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Hi, my name is Arsen. I’m a Senior C++ and Python developer with 5+ years of experience building software for Linux, Windows, and embedded systems. I focus on clean, efficient, and reliable solutions for low level, backend, and performance critical tasks. What I bring to projects: • C/C++ development: STL, Boost, Boost ASIO, Qt, WinAPI, OCCI, V8, POSIX, multithreading • Python development: automation tools, data pipelines, backend logic, Django • Database engineering: Oracle, SQLite, MongoDB, data export tools, batch processing, custom type conversion • Linux systems programming: networking utilities, driver level interaction, Linux kernel headers, OpenWRT, desktop and CLI tools • Wireless and low level networking: Generic Netlink, nl80211, libnl/libmnl, Wi Fi scanning tools, protocol and frame parsing • Reliability and performance: profiling, transactional workflows, data integrity focused design, Dockerized builds, CI/CD with TeamCity • Cross platform delivery: Linux and Windows applications, Make, CMake, Conan, Git/SVN, GDB, Valgrind, Doxygen, Bash I have built tools ranging from high performance Wi Fi scanners in C that interact directly with the Linux wireless stack, to cross platform C++ command line utilities that export Oracle data into SQLite with transactional safety and performance profiling. I am comfortable working close to the system, optimizing throughput, handling large datasets, and designing software that is maintainable and stable in production. Clients usually trust me with complex backend, systems, and infrastructure related tasks where performance, correctness, and long term reliability matter. If you are looking for a developer who can work on C++, Python, Linux internals, networking, or data heavy applications, let’s talk. 🙂

I’m a Top Rated full-stack mobile developer with 10+ years of experience building production apps for iOS, Android, and web. I help founders, agencies, and product teams turn ideas, designs, and existing codebases into reliable, scalable apps. My strongest work is mobile-first products: marketplaces, SaaS platforms, fintech, health/wellness apps, IoT/BLE apps, AI-powered tools, and app rescue/takeover projects. Core development: - iOS: Swift, SwiftUI, Objective-C - Android: Kotlin, Java - Cross-platform: Flutter, React Native - Backend: Node.js, Firebase, Supabase, PostgreSQL, REST APIs - Payments/subscriptions: Stripe, RevenueCat, Apple/Google IAP - App launch: TestFlight, App Store, Google Play AI and automation: - OpenAI / ChatGPT API, Claude, Gemini - AI assistants, RAG, workflow automation, internal tools - Claude Code, Codex, Cursor, Copilot - n8n and agentic workflows How I work: - Clear daily communication - Weekly demos - Clean Git workflow - Practical architecture - Fast iteration without sacrificing maintainability - Honest feedback when a feature is too expensive, risky, or should be simplified If you need someone who can think through the product, build the app, connect the backend, integrate AI where it makes sense, and help ship to production, I’d be happy to talk.

I help fintech, crypto, and SaaS companies design, scale, and optimize distributed backend systems and payment infrastructure. With 25+ years of software engineering experience, I have worked across the entire stack—from low-level systems programming and hardware integration to modern cloud-native architectures built with Node.js and TypeScript. My background combines software architecture, cryptography, and financial operations, allowing me to bridge the gap between engineering decisions and business outcomes. Selected Results: ✔ Architected a global proxy infrastructure managing thousands of distributed IoT devices across multiple regions under sustained high load. ✔ Reduced blockchain transaction costs by approximately 90% through optimization of TRON energy management, generating six-figure annual savings for the client. ✔ Designed custom encryption and security mechanisms that prevented a five-figure financial loss when standard protections proved insufficient. Core Expertise: • System Architecture & Technical Leadership * Microservices (NestJS) * Event-Driven Architecture * Domain-Driven Design (DDD) * Distributed Systems * Performance Optimization • Fintech & Crypto Infrastructure * Payment Gateways (Crypto, Stripe, Custom Integrations) * Wallet and Ledger Systems * Double-Entry Accounting Logic * Blockchain Integrations (TRON, BTC, USDT) * Trading and Automation Systems • Infrastructure & Hardware Integration * IoT Platforms * Cisco and MikroTik Networks * VoIP Systems (Asterisk) * Custom Device Management Platforms Technology Stack: TypeScript, Node.js, NestJS, PostgreSQL, MongoDB, Redis, RabbitMQ, Docker, Linux I work best with companies that need more than implementation alone—whether that's designing a new platform, scaling an existing system, auditing architecture, or solving performance and reliability issues in production environments. I can help with: • Architecture Reviews & Technical Due Diligence • System Design & Scalability Planning • Performance Bottleneck Analysis • Fintech & Payment Infrastructure • Legacy System Modernization • Technical Leadership & Architecture Consulting

I'm the founder of Sirin Software, a Florida-based R&D company with a development center in Kyiv, Ukraine. My team and I, comprising more than 40 software developers, work with embedded systems, IoT products, and Web3 applications. We have extensive experience in hardware design and software development. Core values: Solution-Centric Approach: We focus on solving problems and contributing to product concepts—we're more than just coders. Honesty: We never overpromise. Client Satisfaction: Delivering 5-star client experiences is our top priority, as reflected in real client reviews. Our main areas of expertise include: Embedded Linux: Device Drivers, BSPs, Yocto, Buildroot, OpenWRT Wired and Wireless Networking (WiFi, Bluetooth, ZigBee/Z-Wave, LoRaWAN, and more) Bare-metal and RTOS-based firmware for ARM and RISC-V (STM32, ESP32, nRF52, etc.) Cybersecurity: Network monitoring, intrusion detection Web3: Ethereum and Solana blockchain solutions Our hard skills (not limited to) include: C, C++, Python, Rust, Golang, JS/TS, Node.js, React.js, AWS, GCP, and MS Azure.

If you need a senior full stack developer who ships production-ready code on time, you are in the right place. As a web developer and react developer with 5 plus years of commercial development, I build platforms that scale and deliver results. Get in touch today and let's start your project I am a full stack developer and AI developer in React, Next.js, Node.js, TypeScript, and Python. As a full stack developer I cover front end developer work in React, backend API engineering, database architecture, and AWS cloud. As a full stack developer I work with startups and enterprise teams from MVP to full-scale SaaS with features like analytics, admin panels, and billing. Whether you need a web developer for a landing page or a full stack developer for a complex platform, I deliver complete solutions from architecture to launch. I am a full stack developer with fullstack products across SaaS, healthcare, analytics, trading, and digital commerce As a react developer I build fast, interactive applications in React, Next.js, and JavaScript with TypeScript. My work as a front end developer covers Figma-to-code implementation, dynamic UI, web design, and Tailwind CSS. As a web developer and front end developer my Core Web Vitals score 90 to 95 plus. I am a react developer skilled in the MERN stack, GraphQL, REST, WebSocket, and front-end browser extension. I work as a react native developer and mobile app developer delivering cross-platform apps on secure backend services. As a full stack developer and react developer I lead frontend from simple landing pages to complex interactive portals As an AI developer I integrate LLM APIs including OpenAI, Claude, and custom LLM solutions into production apps. My work as an AI developer includes ai-powered chat, AI agents for sales automation, ai-driven n8n workflows, smart data pipelines, and bot creation. As a full stack developer and AI developer I architect backend systems using FastAPI, Django, Node.js, and NestJS connected to React front end interfaces. I am an AI developer bringing real power, game-changing automation, and innovative solutions to healthcare, trading, and enterprise products. As a python developer I build data scripts and backend services. As an AI developer and react developer I work from core backend fabric to a pro UI, setting the right vibe for your brand As a react developer and front end developer I translate Figma designs into clean, secure interfaces. As a full stack developer and front end developer my work covers PDF generation, embedded video, dynamic form systems, signup flows, Google and Meta ads tracking, content management, and ui/ux. As a front end developer I have delivered conversion-optimized sites, interactive dashboards, and portals. As a web developer I review and fix existing code, optimize performance, and focus on clean systems I am a wordpress developer with expertise in custom plugin development, PHP, Elementor, CMS setup, WooCommerce, and template customization. As a wordpress developer I handle migration, web design, and maintenance for business websites and online stores. I work as a web developer across Shopify, Webflow, Bubble, Softr, Xano, Replit, and GoHighLevel, making me a versatile web developer for any tool. As a full stack developer I set up and extend ERP platforms — ERPNext, Odoo, and Dynamics — connecting them to custom front-end applications As a full stack developer my integration work covers HubSpot, Salesforce, SharePoint, Twilio, WhatsApp, Stripe, and n8n workflow automation. I am a full stack developer who has built marketplace systems, crypto and web3 blockchain apps, and trading platforms. As a full stack developer and consultant I lead products from MVP to enterprise scale. Tech stack as a full stack developer: React, Next.js, Node.js, NestJS, FastAPI, Django, Laravel, Java, Rust, Python, PHP, PostgreSQL, Supabase, AWS, Docker, CI/CD, REST, GraphQL, gRPC, WebSocket I am a full stack developer bringing debugging expertise, code review, and smart architecture to every contract. Auto1 Group: senior full stack developer on React and Next.js (millions of users) Universe Group: full stack developer for SaaS analytics, A/B testing, and conversion program development Extreme Idea: full stack developer building a SaaS marketplace, admin panels, and CRM integrations. I am a specialist, mentor, and lead programmer with a portfolio across mobile, digital, creative, and studio projects. Technical assistance available as a dev, engineer, designer, and coding expert for long-term work — available for a discovery call, let's connect I am a full stack developer, web developer, react developer, front end developer, AI developer, wordpress developer, and programmer for complete software engineering: architecture, development, testing, deployment, and maintenance. A trusted full stack developer for companies needing clean, secure code. MSc Computer Science, BSc Applied Math, Kyiv-Mohyla Academy

Greetings! I have been working as a Java developer for more than 14 years, my main clients are from Europe, Israel, India, China and USA. I am developing both desktop software and web applications, RESTful microservices etc. You can safely entrust me with the work on your project and will never be disappointed in our cooperation, I can guarantee the high responsibility and quality of the tasks that I carry out, which you can be sure of when you take me to your team. Main skills: Java technologies: - Java 8, 9, 11, 17 - JavaFX - Zuul, Ribbon, Eureka - Spring: Core, MVC, Web-flow, Integration, Batch, Boot, Social, Data, Config - Quarkus - Maven 2/3, JUnit 4 - JMS: RabbitMQ, ActiveMQ - JDBC, Hibernate 3.x, Neo4j - ESB, JNDI, JSP - WebDriver - JHipster NodeJS development: assisting libraries: express, async, soap, log4js connectivity: mongodb, redis, stomp-client, socket-io testing, building: should, mocha, grunt deployment: PM2, npm publishing and related activities promises, some EcmaScript 6 thingies Front-end development: Angular HTML 5, CSS 3, JavaScript (ES 5/6) JQuery, Bootstrap Other: pug (jade) Datastores: MySQL, MongoDB, PostgreSQL Other: AWS, Google Cloud, Azure services: Compute Engine, Cloud Storage, Data Store, SQL regular usage of Linux-based systems (anything necessary to develop and support software) infrastructure: Jenkins, SVN, git - commit/push/pull level ActiveMQ, Camel Elasticsearch