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I am an experienced Go Software Engineer with 9 years of industry experience, mainly working on Backend Development and scalable architecture/cloud-native solutions. My competence is in creating fast, high-performance applications using Golang and integrating modern technologies such as Docker, Kubernetes, and AWS into systems that scale effortlessly. I excel in the following skills: - Backend Development: Developing Microservices, APIs (RESTful, GraphQL, gRPC), and database-driven applications. - Cloud Technologies: Design reliable and cost-efficient infrastructure deployments on AWS, GCP, Azure or other cloud platforms. - High Load & Scalability: Architecting systems for millions of users and data points without a single hitch. - DevOps Integration: The main goal is to provide smooth pipelines of CI/CD by automating deployments with Terraform, Docker, and Kubernetes. - Blockchain & Smart Contracts: Developing decentralized solutions with Go, Solidity, Rust, and Ethereum. Key Highlights : - Delivered cloud processing solution for industrial IoT devices, enhancing system performance by 20,000%. - Successfully designed and deployed a complex management platform for a transportation system, highly appreciated by clients due to its reliability and speed. - Single-handedly delivered mobile advertising network with throughput capabilities of 1300 RPS. - Experience working with cross-functional remote teams to deliver under tight deadlines. Why Hire Me? I bring a wealth of experience in technology working for your business needs and understanding the exact translation of your needs and problems into solutions. My proactive communication and dedication to quality help me bring value to every project. Let’s build something amazing! 🛠️🚀 Last updated 09-04-2026

I am an AI Agent and Automation Developer with 12+ years in software engineering, the last 5 focused entirely on AI agents, machine learning systems, LLM applications, RAG pipelines, and workflow automation that ships to real users. n8n Automation & AI Agents I build n8n workflows and Make,com or Zapier when they fit better for lead routing, data sync, content pipelines, support triage, and internal reporting. When a workflow needs to think rather than just follow rules, I integrate AI agents powered by GPT-4, Claude, or open-source LLMs so they make decisions autonomously. AI Voice Agents & Conversational AI I build AI voice agents using Vapi and Retell that handle real phone calls, qualify leads, book appointments, and answer customer queries trained on your scripts and connected to your CRM. Beyond voice, I develop conversational AI assistants, multi-agent systems, and agentic workflows where multiple AI agents collaborate to complete complex tasks end to end without human intervention. Machine Learning & Deep Learning I design and deploy machine learning models and deep learning solutions using PyTorch and TensorFlow from data preprocessing and model training to fine-tuning pre-trained models on your custom dataset. Whether you need a classification model, NLP pipeline, recommendation engine, or a neural network built from scratch, I build it production-ready with proper testing and monitoring. Chatbots & Generative AI Apps GPT-4, OpenAI, LLaMA, Claude I use whatever model fits the use case and budget. That covers the full stack: model selection, fine-tuning on your data, building a RAG pipeline with LangChain or LlamaIndex, vector database setup with Pinecone or ChromaDB, and deploying to production. Support bots, sales assistants, internal knowledge agents I have built them all. API Integration & System Connectivity Most AI projects die at the integration step. I make sure yours does not. REST APIs, webhooks, OpenAI and Claude API integration, CRM and database connectivity, Slack, Notion, internal dashboards whatever your stack looks like. A few things worth knowing: → I push for a small prototype before a full build faster, cheaper, and proves the idea works in your real environment → I write production code tests, error handling, logging, retry logic the unglamorous stuff that keeps your project running in six months → I will tell you when AI is not the answer if a Zapier flow beats a custom machine learning model, I will say so Core Stack: Python · n8n · LangChain · LlamaIndex · OpenAI API · Claude API · GPT-4 · LLaMA · Vapi · Retell · Voice AI · RAG Pipelines · Machine Learning · Deep Learning · Neural Networks · PyTorch · TensorFlow · Pinecone · ChromaDB · FAISS · Make,com · Zapier · Docker · AWS · Google Cloud · REST APIs Got a project in mind even half-formed? Send me a message and I will tell you honestly whether I am the right person for it.

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!

$100M+ in Client Revenue | Expert-Vetted (Top 1% Upwork) | 240+ Projects | 100% Job Success | 10+ Years on Upwork I’m a Full Stack Developer, SaaS Developer and Backend Developer focused on building production-ready software that holds up under real-world usage. My work sits at the intersection of software developer, web developer, and SaaS platform builder, with a strong backend-first mindset and deep attention to scalability, performance, and long-term maintainability. As a Full Stack Developer, I take ownership of systems end-to-end, pairing robust backend architecture with clean, modern interfaces. My frontend work is typically React-based and I often collaborate with or replace traditional React developer or web developer setups by owning both frontend and backend in a single, coherent system. While I’ve previously worked as a WordPress developer and integrated WordPress-based sites into custom platforms, my current focus is on custom SaaS and API-driven systems rather than CMS-centric builds. As a SaaS Developer, I help companies design, build and scale SaaS products, internal tools and API-driven web applications intended for long-term use. My experience as both a Backend Developer and software developer allows me to think beyond features and focus on architecture, reliability and operational stability from day one. Many of the platforms I build support internal teams, customer dashboards and multi-role workflows where permissions, data integrity and business rules are critical. In my day-to-day work as a Backend Developer, I design and implement backend services, APIs and data models that power SaaS platforms, complex web applications and mobile-connected systems. I regularly work with Node.js and Python, drawing on my background as a Python developer to build scalable services, background jobs and asynchronous workflows that perform reliably in production. As a Full Stack Developer, I ensure these backend systems integrate cleanly with frontend applications, mobile extensions and third-party APIs. When required, I support frontend and mobile app developer workflows using React and React Native. This end-to-end ownership is a key reason clients bring me in as a Full Stack Developer rather than splitting work across multiple roles. A significant portion of my work as a SaaS Developer and Backend Developer involves building internal platforms, dashboards and API-first systems that integrate external services. In these projects, I often collaborate closely with product, growth, or analytics teams, including teams focused on SaaS marketing by designing clean data pipelines, event tracking and backend logic that supports experimentation, reporting and lifecycle insights. When projects require AI-powered functionality, I bring hands-on experience integrating AI into backend systems. While my primary role remains Full Stack Developer and Backend Developer, I regularly implement AI-enabled workflows, data processing pipelines and LLM-driven features inside SaaS platforms. This allows me, as a SaaS Developer, to deliver AI functionality that is reliable, observable and cost-controlled rather than experimental. Clients typically work with me when they need: - a Full Stack Developer who can own frontend and backend - a SaaS Developer who understands long-term scalability constraints - a Backend Developer experienced with real production systems - mobile app developer and React developer experience as a software developer - backend services built with Node.js or Python by an experienced Python developer - web applications with complex workflows and business rules from a senior web developer - API-driven architectures and third-party integrations - SaaS platforms designed to support growth, analytics and SaaS marketing data needs - MVPs that can realistically evolve into long-term SaaS products A large part of my work as a Full Stack Developer, SaaS Developer and Backend Developer focuses on: - multi-role dashboards and internal tools - authentication, authorization and permissions - API-first backend system design - integrations with external platforms, including legacy CMS or WordPress-based systems when required My core work as a Backend Developer and Full Stack Developer covers: - backend services built with Node.js and Python - APIs, background jobs and integrations - databases such as PostgreSQL - modern stacks using tools like Supabase - AI-enabled backend features where they add real business value I regularly work on MVP builds and early-stage products as a SaaS Developer, with strong focus on solid backend foundations, sensible scaling paths and avoiding short-lived prototypes. Based on scope and timing, I work hands-on as a Full Stack Developer, SaaS Developer and Backend Developer and when useful, involve specialists from my team. Long-term results come from clarity and intentional system design. I focus on delivering software that teams can confidently run, maintain and scale.

I help startups and product teams ship production-ready web and mobile apps — on time, well-architected, and easy to hand off. Over 10 years I've gone from writing the first line of code to leading full engineering teams, including a SaaS platform on AWS that held 99.9% uptime under heavy traffic. Recent clients call me "committed to quality," "reliable," and someone who "does not fail the deadline." That's the baseline I hold myself to on every project. What I'm best at: ✔ React / Next.js frontends that are fast and maintainable ✔ Node.js + TypeScript backends and REST/GraphQL APIs ✔ React Native mobile apps (iOS & Android) ✔ AWS infrastructure — ECS, Fargate, Docker, CI/CD ✔ Real-time features: WebSockets, live dashboards, chat systems ✔ Fintech integrations: payment gateways, compliance, encryption ✔ PostgreSQL, MongoDB, Firebase I work with a small number of clients at a time so you get my full attention — not a response from a VA at 2am. If you have a project in mind, message me with a brief description and I'll tell you honestly if I'm the right fit.

11+ year EXPERT software engineer & ex-McCann #1 agency worldwide, ex-technical lead at #1 fin-tech trading scale-up (NL), Bentley, Opel and countless others, with top-level industry experience across Europe, combined with a cutting-edge knowledge of efficient AI workflow. I’m a highly skilled expert, BE/Full-Stack Engineer & Software Engineer with expertise in building high-performance, scalable, quality applications for millions of users. With 11+ years of experience, I’ve helped companies generate 8+ figures in revenue by developing scalable, efficient, and cutting-edge solutions. I'm extra productive thanks to countless Udemy courses, cutting-edge usage of AI tools and prompt engineering. 💡 What I Bring to the Table: AI, Up-to-date with AI tooling such as Cursor.AI, Claude, and Copilot. Highly efficient work Deep Commercial Expertise in: Node.js, NestJS, GoLang, React, React Native, Next.js, Vue.js, TypeScript, Event-Driven Architectures (Kafka), Microservices, DevOps, and Cloud Infrastructure. Modern AI tools and frameworks and automation software like Lovable, Supabase, Airtable, N8N, Zapier. Data pipelines / Kafka Connectors for transforming / cleaning data for BI (BigQuery). Worked with dozens of integrations and API such as OpenAI GPT Industry Experience, Worked with leading brands like: ✅ Bitvavo, (10-figure #1 market leader in EU) Deloitte fast-50 winner '21 (As the growth lead) ✅ McCann - #1 WORLDWIDE Ranked agency in NA/EU Global Effie Index (~$10bn p/a revenue) ✅ Urban Sports Club, the #1 market leader in the EU ✅ Jumbo Supermarket - 10-figure market leader ✅ Bentley Motors ✅ Vauxhall ✅ Opel ✅ Bosch, to name a few. Proven Track Record: Helped scale Bitvavo, the largest crypto exchange in the Netherlands, to win the Deloitte Fast 50 Award (2021) Fastest growing company as Growth Tech Lead. Global Availability: Open to projects in EU & APAC time zones. Native English speaker from the UK. 🛠️ Tech Stack & Skills: ✔ AI-First Development: Cursor, Claude Code / Claude Projects, GitHub Copilot, OpenAI / Anthropic APIs, LangChain, prompt engineering & AI agents, vector databases, Supabase. ✔ Backend: Node.js (NestJS + Fastify), GoLang, TypeScript, Event-Driven Architectures (Kafka, RabbitMQ), Microservices, Serverless (AWS Lambda, Vercel) ✔ Frontend: React.js, Next.js, Vue.js ✔ Databases: PostgreSQL, MongoDB, Redis, Elasticsearch, BigQuery, Kafka Connectors for data pipelines ✔ DevOps & Cloud: Kafka, Confluent, RabbitMQ, Kubernetes, AWS, GCP, Terraform, Helm, Docker ✔ Observability & Alerting: Grafana, Kibana, Logstash, Sentry, EKS ✔ E-commerce: WooCommerce, Shopify ✔ APIs & Integrations: Facebook API, Google API, YouTube API, MailChimp API, Braze, AppsFlyer, GTM, GA, OpenAI Chat-GPT API ✔ CI/CD & Version Control: Git, GitHub, GitLab, BitBucket, ARGO.CD 📌 Why Work With Me? ✅ 11+ years of REAL experience working with 30+ TOP clients across various industries ✅ Up-to-date with AI building, super-efficient, fast workflows ✅ Proven ability to scale applications and improve performance ✅ Deep expertise in software engineering, complex and scalable applications ✅ Ready to sign NDAs and contracts for confidentiality and compliance 🚀 Let’s build something great together. Hire me now! 🚀