Professional Summary Senior Full Stack Engineer with 11+ years of experience leading full-lifecycle development of secure, scalable systems across fintech, retail, and SaaS domains. Built and scaled platforms handling up to 3M+ users, reduced deployment cycles by 70%, and improved API efficiency by over 85%. Adept at aligning cross-functional teams, integrating modern microservices, and leading architecture efforts that improve uptime and performance.

I build, fix, and maintain production automation systems — primarily in n8n. My work sits at the intersection of workflow orchestration, API integration, and operational reliability. If your business runs on automated pipelines that need to work every single time, that's where I operate. ▸ 𝗖𝗼𝗿𝗲 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲 My typical engagement involves multi-step pipelines with structured data flow, state management, error handling, and integrations spanning 5–15 services. I am not a script writer — I think in systems. n8n is my primary platform. I work daily with self-hosted instances, understand credential management deeply, and am fluent in building code nodes (JavaScript), webhook triggers, sub-workflows, retry logic, and execution monitoring. I've debugged everything from silent OAuth token expiration to race conditions in polling-based sync workflows. ▸ 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀 𝗜'𝘃𝗲 𝗪𝗼𝗿𝗸𝗲𝗱 𝗪𝗶𝘁𝗵 𝘈𝘶𝘵𝘰𝘮𝘢𝘵𝘪𝘰𝘯: n8n, Zapier, Make · 𝘓𝘢𝘯𝘨𝘶𝘢𝘨𝘦𝘴: Python, JavaScript, C#, PHP, Rust, C, Java, SQL, HTML/CSS, Bash, Nushell, Pinescript, Google Apps Script · 𝘍𝘳𝘢𝘮𝘦𝘸𝘰𝘳𝘬𝘴: Django, FastAPI, Node, ASP.NET, React, Svelte/Kit, Astro · 𝘋𝘢𝘵𝘢𝘣𝘢𝘴𝘦𝘴 & 𝘖𝘙𝘔𝘴: PostgreSQL, SQLite, Azure SQL, Firebase, Drizzle, Prisma, SQLAlchemy, GraphQL · 𝘊𝘭𝘰𝘶𝘥 & 𝘏𝘰𝘴𝘵𝘪𝘯𝘨: AWS, Google Cloud Functions, Azure Container Apps, Azure DevOps, Railway, Hetzner, Scaleway, Vercel, Netlify, Heroku · 𝘋𝘦𝘷𝘖𝘱𝘴: Git, GitHub Actions · 𝘉𝘶𝘴𝘪𝘯𝘦𝘴𝘴 𝘛𝘰𝘰𝘭𝘴 & 𝘊𝘙𝘔: Salesforce, Microsoft Dynamics, SharePoint, Retool, Google Sheets, Google Contacts, Gmail API, Zoom · 𝘌-𝘤𝘰𝘮𝘮𝘦𝘳𝘤𝘦 & 𝘞𝘦𝘣: Shopify, Stripe, WordPress, Wix, Webflow · 𝘈𝘐: Claude, OpenAI · 𝘚𝘤𝘳𝘢𝘱𝘪𝘯𝘨 & 𝘛𝘦𝘴𝘵𝘪𝘯𝘨: Playwright, Selenium · 𝘈𝘶𝘵𝘩 & 𝘔𝘰𝘯𝘪𝘵𝘰𝘳𝘪𝘯𝘨: Auth0, OpenObserve · 𝘖𝘚: NixOS, Pop! OS, Windows, MacOS, PowerShell · 𝘖𝘵𝘩𝘦𝘳: TradingView, Front Arena (Finastra), DHL, Cotality API, Zorgkaart.nl, Recombee, Frisbii, Quickchart, Twitter/X, COSMIC If your stack isn't on this list, I'll adapt — that's what 13 years of doing this gets you. ▸ 𝗪𝗵𝗮𝘁 𝗜 𝗗𝗲𝗹𝗶𝘃𝗲𝗿 𝘋𝘦𝘧𝘦𝘯𝘴𝘪𝘷𝘦 𝘈𝘳𝘤𝘩𝘪𝘵𝘦𝘤𝘵𝘶𝘳𝘦 — Every workflow I build includes input validation, retry-with-backoff on external API calls, structured error logging, and failure alerts. Systems should fail visibly, never silently. I build quality filters before record creation to prevent ghost records, implement rate limit compliance, and ensure every execution is traceable from trigger to completion. 𝘚𝘵𝘳𝘶𝘤𝘵𝘶𝘳𝘦𝘥 𝘋𝘢𝘵𝘢 𝘍𝘭𝘰𝘸 — I design sanitization layers (name normalization, date formatting, phone cleanup, case number parsing) as reusable functions applied consistently across workflows. Data quality is enforced at the boundary, before it propagates downstream to documents, calendar events, or external APIs. 𝘋𝘰𝘤𝘶𝘮𝘦𝘯𝘵𝘢𝘵𝘪𝘰𝘯 — Every deliverable comes with written technical documentation: what was built, what it connects to, how it handles failure, and how to extend it. I write docs so that another developer — or you — can maintain the system without me. 𝘔𝘢𝘪𝘯𝘵𝘢𝘪𝘯𝘢𝘣𝘭𝘦 𝘏𝘢𝘯𝘥𝘰𝘧𝘧 — I build clean setups that clients can manage after delivery. Configuration lives in sheets or Airtable tables, not hardcoded in workflow nodes. When I leave, the system keeps running. ▸ 𝗧𝘆𝗽𝗶𝗰𝗮𝗹 𝗣𝗿𝗼𝗷𝗲𝗰𝘁𝘀 → Multi-step intake automation: form submission → AI data extraction → database record creation → folder provisioning → notification alerts → Email automation pipelines: Google Sheets trigger → AI-generated personalized emails → Gmail send → status tracking → follow-up sequences → CRM-to-outreach systems: lead status webhooks → PDF offer generation → timed email sequences → bidirectional status sync → Social media posting: sitemap parsing → content scheduling → multi-platform publishing (Facebook, X, Threads) → Freelancer/candidate screening: data extraction → AI evaluation pipeline → ranking → follow-up question generation → OAuth integration setup: developer console registration → scope mapping → credential vault storage → tested n8n connections → Personal productivity systems: email/calendar/task capture → smart digest generation → Slack/SMS notifications ▸ 𝗛𝗼𝘄 𝗜 𝗪𝗼𝗿𝗸 Same-day response on urgent issues. Plain language, direct communication. I scope before I quote and provide hourly breakdowns on request. I'm comfortable with milestone-based fixed pricing, hourly arrangements, or monthly retainers for ongoing maintenance. For retainer engagements, I proactively monitor execution logs, catch failures before they're reported, and deliver monthly status reports covering what was fixed, what was monitored, and what needs attention. Available 15–30 hours/week. Flexible on timezone overlap.

I’m a professional web developer specializing in modern front-end and back-end technologies, including Vue.js, React, Astro, and Laravel. My expertise covers custom component development, efficient landing page creation, comprehensive testing with Cypress, and reliable web hosting solutions. My core skills include: • Front-end Development: Expert-level proficiency in Vue.js and React frameworks, building modular and reusable components, and creating interactive user experiences. • Astro Framework: Creating fast, optimized static websites and landing pages with Astro. • Laravel Development: Designing robust back-end solutions, APIs, and database integrations using Laravel. • Component Building: Developing modular, reusable components to ensure maintainability and scalability. • Testing with Cypress: Ensuring high-quality code through rigorous end-to-end testing using Cypress. • Landing Page Creation: Crafting visually appealing, responsive landing pages optimized for conversions. • Web Hosting Management: Providing reliable web hosting solutions to deploy and maintain your projects seamlessly. My approach emphasizes clean code, performance optimization, excellent communication, and timely delivery. I’m committed to helping my clients achieve their business goals by delivering high-quality websites and web applications tailored to their specific needs.

Looking for a partner to build your next web application? I’m a full-stack developer with a passion for bringing ideas to life, handling the entire technical stack so you can focus on your business. My expertise lies in building dynamic, scalable solutions with Nuxt.js/Vue or Next.js/React, and Firebase. I'm an end-to-end solution provider. I'll take care of every technical detail, including: - Full Stack Setup: From hosting and backend databases to a headless CMS (like Storyblok) and search providers (like Algolia). - High-Quality Code: I deliver field-tested, reliable code quickly. - Seamless Communication: I pride myself on being highly responsive and keeping you in the loop throughout the entire project.

I help startups and growing businesses build scalable SaaS platforms using Ruby on Rails. From MVP to production-scale systems, I design and develop secure, high-performance web applications with clean architecture and long-term maintainability in mind. If you're building a subscription-based product or need to scale an existing Rails application, I can help you turn it into a stable revenue engine.

𝐇𝐢 𝐭𝐡𝐞𝐫𝐞, 𝐈’𝐦 𝐌𝐨𝐡𝐚𝐦𝐞𝐝! As a 𝐅𝐮𝐥𝐥 𝐒𝐭𝐚𝐜𝐤 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 and 𝐂𝐓𝐎 with years of experience working with 𝐭𝐞𝐜𝐡 𝐬𝐭𝐚𝐫𝐭𝐮𝐩𝐬, I specialize in building 𝐬𝐜𝐚𝐥𝐚𝐛𝐥𝐞 𝐬𝐨𝐟𝐭𝐰𝐚𝐫𝐞 𝐬𝐨𝐥𝐮𝐭𝐢𝐨𝐧𝐬 that power growth. Whether you’re in the 𝐩𝐫𝐞-𝐬𝐞𝐞𝐝, 𝐬𝐭𝐚𝐫𝐭𝐮𝐩, or 𝐬𝐜𝐚𝐥𝐞-𝐮𝐩 phase, I’m here to help you overcome technical challenges and create high-performance web applications that deliver results. I have expertise in the𝐌𝐄𝐑𝐍/𝐌𝐄𝐀𝐍 𝐬𝐭𝐚𝐜𝐤 𝐋𝐚𝐫𝐚𝐯𝐞𝐥, and 𝐜𝐥𝐨𝐮𝐝-𝐛𝐚𝐬𝐞𝐝 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭, and my goal is to help you build and optimize your project from scratch, or refine your existing systems for maximum impact. 𝗪𝗵𝗮𝘁 𝗜 𝗗𝗼 𝗕𝗲𝘀𝘁 𝐒𝐭𝐚𝐫𝐭𝐮𝐩-𝐅𝐨𝐜𝐮𝐬𝐞𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: I understand the challenges of growing a tech startup. From crafting technical roadmaps to executing development, I help you build the systems you need for long-term success. 𝐒𝐜𝐚𝐥𝐚𝐛𝐥𝐞 𝐖𝐞𝐛 𝐀𝐩𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧𝐬: Whether you're looking for a custom web app, responsive 𝐔𝐈/𝐔𝐗, or a robust backend, I focus on creating scalable solutions that can grow with your business. 𝐀𝐏𝐈 & 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧 𝐒𝐨𝐥𝐮𝐭𝐢𝐨𝐧𝐬: I’ve developed and integrated multiple 𝐑𝐄𝐒𝐓 𝐀𝐏𝐈𝐬, ensuring smooth communication between systems and platforms, and driving efficiency across your business. 𝐂𝐥𝐨𝐮𝐝 𝐒𝐨𝐥𝐮𝐭𝐢𝐨𝐧𝐬: Expertise in deploying and managing applications using 𝐀𝐖𝐒, 𝐆𝐨𝐨𝐠𝐥𝐞 𝐂𝐥𝐨𝐮𝐝 and Firebase, ensuring your software is secure, scalable, and reliable. 𝐖𝐡𝐲 𝐖𝐨𝐫𝐤 𝐖𝐢𝐭𝐡 𝐌𝐞? 𝐒𝐭𝐚𝐫𝐭𝐮𝐩𝐬 & 𝐓𝐞𝐜𝐡 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞I specialize in helping startups build and optimize their tech solutions, ensuring you stay ahead of the curve. From the earliest stages to scaling up, I’ve been there every step of the way. 𝐏𝐫𝐨𝐯𝐞𝐧 𝐒𝐮𝐜𝐜𝐞𝐬𝐬:With years of experience as a CTO and developer, I’ve helped clients transform their business ideas into fully-functioning tech solutions that exceed expectations. 𝐂𝐨𝐥𝐥𝐚𝐛𝐨𝐫𝐚𝐭𝐢𝐨𝐧 & 𝐒𝐭𝐫𝐚𝐭𝐞𝐠𝐢𝐜 𝐓𝐡𝐢𝐧𝐤𝐢𝐧𝐠: I don't just develop code; I partner with you to ensure your tech solutions align with your business vision and objectives, ensuring long-term success. 𝐋𝐞𝐭’𝐬 𝐜𝐡𝐚𝐭!I offer a free strategy session where I’ll take a look at your requirements, provide actionable insights, and outline a clear plan to move forward. Just send me a message, and we can get started! Key Skills: Full Stack Developer, MERN Stack, MEAN Stack, Node.js, React.js, Angular, Laravel, API Development, Cloud Development, Backend Development, Frontend Development, UI/UX Design, AWS, Firebase, CI/CD, Progressive Web Apps, Responsive Web Design, Database Optimization, Cloud-Native Applications, Mobile-First Design, Custom API Integration, SaaS Development, Database Management, Web App Development, REST APIs, Backend Architecture, Frontend Solutions, Software Architecture, Web Development, Tech Startup Solutions, Pre-Seed Startups, Startup Development, Product Lifecycle Management, Scalable Software Solutions, Product Owner, CTO. Full Stack Development (MERN/MEAN), Startup Development. Scalable Software Solutions, Web Application Development, CTO Experience for Startups, Custom API Development & Integration, Cloud Solutions (AWS, Firebase, Google Cloud), Frontend (React.js, Angular, Tailwind CSS), Backend (Node.js, Express.js, Laravel),Agile Project Management, Business System Optimization

I am Tim, a full stack developer with over 15 years of experience, specializing in building medium and large web applications. My expertise lies in leveraging a wide range of programming languages, frameworks, and tools to create dynamic and interactive applications that meet the unique requirements of each project. When I'm not coding, you can often find me exploring new technologies and attending tech conferences and meetups. I believe in the power of continuous learning and personal growth, and I actively seek out opportunities to expand my skill set and stay up to date with the latest industry trends. If you're looking for a skilled and dedicated Full Stack Developer who can deliver high-quality solutions tailored to your specific needs, I would be thrilled to discuss your project with you. Feel free to reach out to me, and let's start transforming your ideas into reality. Thank you for visiting my page, and I look forward to the opportunity of working together! My stack Frontend: Jinja2, React.js, Angular, Next.js Backend: Node.js, Express, Python, Django, Java, Flask Mobile: React Native CSS: Bootstrap, Material UI, jQuery, Semantic UI, Tailwind CSS Databases: mySQL, MongoDB, Firebase, SQLite, PostgreSQL Cloud: AWS, GCP Web3: Internet Computer Protocol (ICP), Solidity, Motoko Other tools: Docker, Git, Jira Data tools: Data scraping: Selenium, BeautifulSoup Data analytics: Google Colab, Matplotlib, Pandas, Plotly, Seaborn, IBM SPSS, Jupyter Data visualization: Tableau, D3

Top-Rated | 100% Job Success | 5+ Years Experience Recent review -⭐️⭐️⭐️⭐️⭐️ "Viktor’s architecture and code were impeccable. He was genuinely committed to delivering clean, well-structured solutions, and beyond being a highly skilled developer, he was a loyal and supportive friend. I’m truly grateful for the experience of working with him, and I’m sure we’ll collaborate again in the future." Hi, I'm Viktor, a Full-Stack and SaaS Developer with 5+ years of experience helping startups and businesses build high-performance web applications and scalable solutions. I specialize in turning complex ideas into clean, reliable, and production-ready solutions with a strong focus on architecture, performance, and long-term maintainability. My core expertise: ✅ Front-End: TypeScript, React, Next.js, Vue.js, Tailwind CSS, Shadcn responsive & accessible UIs ✅ Back-End: Node.js, Express, Next.js Server Actions, Python (AI/ML workflows), Microservices, WebSockets, Clean Architecture ✅ AI & Agents: Fine-tuning (LoRA, Flux/Redux), Prompt Engineering, Custom MCP for autonomous actions, ComfyUI workflows, conversational AI ✅ Databases: PostgreSQL, MySQL, MongoDB, Neo4j, graph-based systems ✅ Other: Custom auth, real-time features, scalable architecture, end-to-end development Key highlights: → Built a large-scale AI social network with graph database architecture, autonomous AI agents, and real-time connections → Delivered GDPR-compliant AI image & document platforms - Flux.1.1, semantic search, generation capabilities → Created a production decoy-generation tool for law enforcement using a fine-tuned AI model and ComfyUI workflows → Designing shipping clean, scalable architecture for both enterprise environments and fast-moving startups → Focused on building systems that are not only functional, but maintainable, efficient, and ready to scale ✱ One lesson after 5+ years: Clean scalable architecture is what makes a good app into a great app (especially in the age of AI coding.) ⤵️ Check my recent project examples blow and shoot me a message if you want to build something!

One engineer. Whole product. From the AI strategy call to the running system in production. I'm a senior full-stack engineer with a decade of shipping behind me — and over the last few years, AI integration has become the part of the work I'm most useful at. Not as a prompt engineer or a deck-and-disappear consultant, but as the person who sits in a discovery call, understands your product and workflows, identifies where a model, an embedding store or an agent actually moves the needle, and then builds it. Same pair of hands, all the way through. That's the part most teams are missing right now. AI consultants who can't ship. Engineers who can ship but can't tell you whether the LLM is the right answer in the first place. I do both, and the value is in not splitting them apart. How engagements usually start Most projects start with a call. You tell me what you're trying to build or where you're stuck, I ask questions, and we figure out together whether AI is actually the right answer — and if so, what the smallest useful first step looks like. Sometimes that's a one-page plan and an estimate. Sometimes it's a longer paid discovery if the product is complex enough to warrant it. Either way, I'll tell you honestly when an LLM is the wrong answer — that's part of the value of talking to someone who builds these systems, not just advises on them. What I build – AI & LLM integration · OpenAI, Vertex AI, Bedrock, LangChain. RAG systems, chatbots, agentic workflows, prompt and eval pipelines, embeddings, vector stores. Production-grade — not demos. – Frontend · React, Next.js, Angular, TypeScript. Component-driven UIs, accessibility, performance — built to stay fast at year three. – Backend · NestJS, Express, Python (FastAPI / Django). REST and GraphQL APIs, event-driven systems, queues, background workers. – Data · PostgreSQL, MySQL, MongoDB, vector databases. Schema design, indexing, query plans — the unglamorous parts that decide whether the app holds up under real load. – Cloud & DevOps · Azure, AWS, GCP. Kubernetes, serverless, Terraform / Bicep, CI/CD on Azure DevOps and GitHub Actions. Zero-downtime deploys. – Integrations · Stripe, Firebase Auth, Azure AD B2C, messaging, analytics — wired in cleanly, failure paths covered. How I work Direct, written-first, async-friendly across timezones. Long-running, end-to-end engagements are where I do my best work — I plug in, learn the product, and keep it moving. I take on unfamiliar stacks and domains on purpose. That's usually the part I want. If you've got something ambitious — an AI feature you're not sure how to scope, a product that needs to ship with AI baked in from day one, or a vague idea you need someone to think through honestly before writing any code — let's talk.

Highly skilled Smart Contract and Web3 Engineer. Certified in Web3 development, Golang, Rust, Solidity, and Blockchain Security. Hands-on experience with ERC404, ERC4337, ERC721AC, and other new protocols. Known for projects like Dash2Trade.com, Metcacade.co, Alpacadabraz.io, I have built a reputation as a Quality programmer in the Web3 space, with a specialism in security. Currently enrolled in Moralis In any given month, I am working on: • Smart Contract Audits • NFT Minting Engines • Custom Smart Contracts • Complex dApps and Blockchain Architecture. • Metaverse/Sandbox Development • Marketplaces & Decentralised Exchanges Communication and progress are my keys to success. Once I get started, I manage your project from start to completion. I also have comprehensive knowledge of subjects as crypto drainers, and the newest create2 mechanisms, as well as other known illicit tools. Feel free to ask me for a consultation on how to best protect yourself against them.