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AI Developer | Full Stack Developer | DevOps Specialist
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Solidity smart contract developer with a full-stack JavaScript background and 4 production dApps deployed on Ethereum Sepolia. What I build: - EVM smart contracts (Solidity, Foundry) - Chainlink VRF / Automation integrations - Full-stack dApps (Next.js, wagmi, viem) - DeFi protocols, NFT marketplaces, DAOs - React / Next.js frontends - Node.js backends and REST APIs - DevOps: Docker, Kubernetes, CI/CD, AWS I write test-first, audit-minded code — self-audited 19 bugs across my projects before deployment. 300+ Foundry tests across all projects. Available for: - Smart contract development - Full-stack dApp development - Web3 frontend (Next.js + wagmi/viem) - React/Next.js frontend development - Node.js backend development - DevOps & infrastructure setup - Contract testing and review
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👋 Hi, I'm Leonid Oleksiuk, founder and lead architect at Stellar Logic, a custom software development company based in Warsaw, Poland. I help clients build complex IT solutions: I design the architecture myself and deliver the project with my team, covering backend, frontend, cloud and CI/CD end to end. 🏆 Why work with us: ✔ As lead architect I design scalable systems that fit your budget and timeline. ✔ I can start solo and scale up to a full team (backend, frontend, DevOps, QA) as the project grows. ✔ Senior in-house developers, no outsourcing to random contractors. ✔ Clear communication, predictable delivery, high code quality. 🤝 Tell me about your project and I'll propose the right architecture and team setup.
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I am a senior Full-Stack Software Engineer and DevOps specialist with over 10 years of experience delivering scalable backend architectures, cross-platform mobile apps, and robust desktop solutions. What I bring to your project: • Robust Backends: Node.js, PHP, Java, Python, and SQL/NoSQL databases (MySQL, MongoDB, Oracle, SQLite). • High-Performance Frontends & Mobile: Responsive web apps using React and native-feel mobile apps using React Native. • Modern DevOps & Infrastructure: Automation, containerization, and orchestrations via Docker, Kubernetes, and optimized CI/CD pipelines. I specialize in taking complex software requirements and turning them into secure, production-ready systems. Let's build something great together.
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With over a decade in the software industry, I’ve learned that collaboration and mutual respect are the foundation of any successful team. My journey began with Microsoft technologies in 2007, working with .NET Framework 1.1 through to .NET 8. Over the years, I’ve gained deep experience in building scalable, enterprise-grade applications and backends using .NET, Python, and Node.js. I’ve led technical and DevOps efforts across industries—banking, telecom, travel, and blockchain—building robust infrastructure, increasing test coverage, and driving automation. From smart contract development and AI integrations to CQRS, DDD, Kubernetes, and CI/CD pipelines, I bring a hands-on, adaptive, and quality-driven mindset. Always eager to learn and explore, bridging the gap between development and operations, and delivering reliable, innovative solutions.
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Blockchain builds the future, Backend holds it steady, AI drives the charge – and Hard Work? That’s the heart of it. What’s your take?
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I am a Senior Backend Engineer at Statista with over 5 years of experience in eCommerce and SaaS. I specialize in PHP, GoLang, Java, AWS, and Google Cloud, creating scalable and high-performance systems. My expertise spans microservices, public APIs, and technologies like Docker, Kubernetes, Kafka, and Redis. I’m passionate about innovation and quality, focusing on delivering efficient, future-proof solutions. As a mentor, I’m committed to helping others grow, currently guiding a junior team member on their development journey. Outside of work, I’m interested in IoT, smart homes, and automation. I enjoy skiing, video games, and staying up to date with the latest tech trends. Let’s work together to build something great!
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Web3 Engineer and Full-Stack Developer with hands-on experience designing, developing, and deploying blockchain-based applications, smart contracts, and cloud-native infrastructures. Skilled in building decentralized applications (dApps), scalable APIs, and automated DevOps pipelines. Passionate about integrating blockchain with AI, cloud, and distributed systems to deliver innovative, secure, and user-focused solutions.
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Hello! I am Vladyslav, a Senior Full-Stack and Web3 Developer with over 5 years of experience in building high-performance web apps, scalable backends, and interactive Telegram or crypto ecosystems. I progressed from a Frontend Developer to a Team Lead at an international e-Commerce holding, where I architected large-scale premium platforms. I deliver clean, production-ready code. MY STACK: Frontend: React.js, Next.js, Vue.js, Nuxt.js, TypeScript. Backend and Web3: Python, FastAPI, Celery, Aiogram, Node.js, Solidity. Databases and DevOps: PostgreSQL, MongoDB, Redis, Docker, Docker Compose, CI/CD. Protocols: REST API, WebSockets, GraphQL, Crypto Payments. WHAT I BUILD: 1.Telegram Mini Apps and Bots: GameFi, iGaming, or SaaS with real-time WebSockets and Web3. 2. Custom CRM, ERP and SaaS: Business automation, clinic ecosystems, dashboards, AI agents. 3.High-Load e-Commerce and dApps: Decentralized apps, online stores, trading bots. Let us connect!
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DevOps and systems engineer with 8+ years building and operating production-ready infrastructure. I set up and run CI/CD, containerize applications, automate infrastructure as code, build monitoring and alerting, and put reliable backups and tested disaster recovery in place — with a strong focus on security hardening and secrets hygiene. Core toolkit: GitLab CI, Jenkins; Docker, Docker Compose, Docker Swarm; Ansible, Terraform; Linux; NGINX, HAProxy, Traefik, Caddy; Prometheus, Grafana, ELK, Loki; PostgreSQL, MySQL, Redis; Bash, Python. Cloud and VPS: Google Cloud, Yandex Cloud, Hetzner, Vultr. On the Web3/crypto side I support the operational platform around the product — Docker Compose analytics stacks, internal APIs, monitoring, PostgreSQL backups and disaster recovery, secrets management and infrastructure audits. Not a smart-contract developer; my focus is the reliable infrastructure around Web3 systems. I like clear scope, phased delivery, written context and measurable outco
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Senior DevOps & Cloud Engineer with 10+ years of experience designing, automating, securing, and scaling cloud-native infrastructure for startups, enterprises, and SaaS platforms. Specialized in Kubernetes, CI/CD automation, Infrastructure as Code, cloud architecture, observability, and high-availability production systems. Strong background in AWS, Linux administration, container orchestration, GitOps, and modern DevSecOps practices.
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🚀 Senior Software Engineer with 10+ years of experience building scalable web and mobile applications. 🌐 Strong background in JavaScript/TypeScript development, with a focus on React.js, React Native, and Next.js. 🔁 Proven track record delivering high-quality software in Agile teams across multiple industries.