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$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 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 04-08-2026

As a Back-End Developer with over five years of experience, I specialize in utilizing Node.js and Nest.js to craft efficient microservices adhering to RESTful API, gRPC, and MVC principles. I fine-tune testing efficiency with Jest and bolster software reliability through Test-Driven Development (TDD) methodologies. Additionally, my expertise extends to enhancing communication efficiency by leveraging message brokers like RabbitMQ. I excel in dynamic teams and prioritize continuous learning and innovation.

✅ 100% Job Success | 💎 1,000+ Hours on Upwork | 🚀 MVP in Weeks, Not Months Ex-CTO | AI × Next.js / React / Node.js Architect | 19+ Years Shipping at Scale I build production-ready, AI-powered web applications that scale to millions and convert like crazy using Next.js 14 (App Router), React 18 + TypeScript, Node.js microservices, and the latest LLMs (OpenAI, Anthropic Claude, Gemini, Llama 3, Mistral). As former CTO I’ve led teams that delivered real-time lead-generation engines, intelligent marketing platforms, and AI-enhanced SaaS products for Toyota, Unilever, Amazon, Procter & Gamble, The North Face, American Express, and WWF, collectively generating over $1 billion in revenue for clients. What I deliver today (end-to-end, pixel-perfect, 95–100 Lighthouse): - Next.js 14+ apps with Server Components, Server Actions, ISR/SSR, and edge deployment (Vercel + AWS) - AI features: RAG pipelines, agentic workflows, LLM-powered chat/assistants, smart scoring engines, voice agents (ElevenLabs), document intelligence - React + TypeScript frontends with tRPC, React Query, Zod, and Tailwind CSS - Scalable Node.js backends (NestJS/Fastify), PostgreSQL/Prisma, Redis, WebSockets, GraphQL, Docker + Kubernetes-ready - Full lifecycle: architecture → UX wireframes → secure code → CI/CD → monitoring & A/B testing Recent wins for clients: - Real-time lead distribution dashboard handling 50K+ events/day with AI scoring - Next.js + Claude-powered dynamic landing-page CMS (40%+ conversion lift) - Legacy PHP → modern Next.js/React migration (load time 6s → <1s) - AI agent that qualifies & routes leads automatically (saved clients $400K+/yr) Available immediately for: - React / Next.js greenfield projects - LLM integrations into existing React/Node apps - Performance & architecture audits / rescue missions - Fractional CTO + hands-on development Daily stack: Next.js 14 • React 18 • TypeScript • Node.js • OpenAI • Anthropic • Gemini • Llama • ElevenLabs • tRPC • Prisma • PostgreSQL • Redis • Tailwind • Vercel • Docker • AWS Ready to turn your idea into an AI-first, revenue-generating product fast. Message me and let’s ship something exceptional.

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!

I have been working in the IT sector in several positions over the last 25 years. I am interested in various IT fields: - AI: LLM, NLP, RAG, Generative AI (ChatGPT, GPT-Neo, BERT, LLama, Gemini, MS Copilot, Claude AI, Mistral, Falcon, Bard, Codex, CodeGen), AI/ML Tools (Open AI APIs, Pytorch, Tensorflow, Hugging face), AI Agents (Conversational AI, chatbots, Rasa, Langchain, Task automation, RPA), Multimodal AI (TTS, Speach, Image, video Recognition), model training, fine tuning, Lisp, Matlab neural networks, Prolog. - Digital Audio/Video Broadcasting, streaming, Image/Audio/Video Processing, HLS/DASH/RTSP/RTMP, WebRTC, Live, VoD, DRM. · Architectures : Infrastructure/Networks/Cloud/Virtualization · DevOps, Services, Microservices, APIs · Project Management · Security · Content Management & Design PMI Project Management and BIZZDesign Architect certifications Infrastructure, Operating Systems, Virtualization, Cloud Computing: - Physical and Virtual Machines, System redundancy/Fail-over/Load Balancers/High Availability, Clusters, Fault Tolerance, Reliability, Recovery RPO/RTO, Oracle Exadata, Distributed Transactions and Coordination, DHT, P2P overlays, Recovery, Migrations, SAN/NAS, Kubernetes, Docker, Container Orchestration, Ansible, API, SOA, Microservices. - Windows NT/2003/2008 Server, Linux (Ubuntu/Red Hat/CentOS), Solaris 9/10, VMWare, ESX, VMotion, Oracle Virtual Box, Hyper-V. - Amazon AWS: EC2, S3, EBS, AMI, ELB, Elastic IP, Cloudfront CDN, CloudWatch, Autoscaling, Lambda, Fargate, Cloudtrail, ECS, EKS, IAM, EC2 API tools. VPC, VPN, SAAS, IAAS, PAAS architectures and middleware. - MS Azure : VM, Service fabric, Blob, Backup, Queues, Functions, CDN, DNS, VPC IP Networks, Broadcasting: TCP/IP, Cisco CCNA/CCNP ACI, DVB S/S2/T/T2/C/H, IPTV, OTT, Network Security and Monitoring, Protocol/Packet Analyzers, DNS/DHCP/SMTP/HTTP Servers, Streaming Servers, CDNs, Streaming Audio/Video/Live/OnDemand, Multicast, Adaptive Streaming, Apple HLS/M3U8, HTTP Dynamic Streaming, Smooth Streaming, H.264/H.265, MPEG-4 standard, DRM, Conditional Access, DVB PSI/SI Tables, DVB Headends, STBs Security, Reliability and Distributed systems: Secure transactions and sessions, SSL, Cryptography, Digital signature, Symmetric and asymmetric keys, DES, RSA, Session keys, Fault Tolerance, Fault Avoidance, Reliability, Scalability, Distributed Transactions and Coordination, Microsoft Windows Clusters, Linux GFS, NAS and ISCSI initiators, IBM DS300 NAS network , Fail-over and Fail-back systems, Gigabit Ethernet switches, Redundant network topologies, Switch redundancy, Teaming adaptors, Raid arrays, Data Center Equipments, Legato backups Programming languages: C/C++/Prolog/Lisp/Pascal/Fortran/.NET/C#/PHP/Perl/Cobol/Assembler/Java/J2SE/J2ME/JMF/Python Database Design & Management: SQL Server, MySQL, PostgreSQL, Microsoft Access Protocols, Standards & Tools: FFmpeg MPEG4/H.264/HEVC/RTP/RTSP/RTMP/UDP, Transcoding, Spatial-Temporal Scalability, Video Objects/Shape Coding, Labview, Matlab/Simulink