Senior Backend Engineer | 5+ Years | MS Computer Science (CU Boulder) I specialize in building backend systems that work reliably in production – APIs, databases, integrations, and automation. WHAT I BUILD: → Backend APIs: RESTful services, microservices, third-party integrations → Database Systems: PostgreSQL, Redis, MongoDB – schema design & optimization → Automation: Data pipelines, scheduled jobs, workflow automation → Integrations: Payment systems, CRMs, ERPs, messaging platforms → Chatbots: WhatsApp, Telegram, Discord automation MY TECH STACK: • Languages: Node.js, Python • Databases: PostgreSQL, Redis, MongoDB • APIs: REST, GraphQL, WebSockets • Messaging: WhatsApp Business API, Twilio, Telegram • Deployment: AWS, Docker, Linux, CI/CD BACKGROUND: • 5+ years as a Backend Engineer • MS in Computer Science – University of Colorado Boulder, with published research in the field I ship fast and communicate clearly. Check my reviews – clients appreciate that I understand requirements quickly and deliver exactly what's needed.

Helping businesses design and build scalable backend systems, AI-driven automation, and secure data platforms that perform reliably in real-world environments. With 11+ years of experience across backend engineering, AI systems, cloud infrastructure, and blockchain, the focus is on turning unclear ideas into production-ready solutions without unnecessary complexity. 💡 What businesses typically achieve working with me 🔹 40–70% reduction in reconciliation, audit, and verification effort 🔹 Near-zero data tampering risk through immutable on-chain proofs 🔹 30–50% faster approval, settlement, and validation workflows 🔹 Reduced fraud and dispute exposure through transparent system design 🔹 Lower long-term operational risk via hybrid on-chain and off-chain architectures 🔹 Reduced manual operations through AI automation 🔹 Faster decision-making with intelligent systems 🔹 Scalable backend architecture built for real usage 🔹 Improved system reliability, performance, and cost efficiency 🔹 Reduced manual operations through AI automation (Exact outcomes vary by use case and industry, but these ranges are realistic and consistently achievable with the right design.) 🚀 Core Capabilities 🔹 AI systems including LLMs, RAG pipelines, and multi-agent workflows 🔹 Backend development using Python, FastAPI, Node.js, and microservices 🔹 Real-time systems such as voice AI, chat platforms, and event-driven architectures 🔹 Cloud infrastructure across Azure, AWS, Docker, and Kubernetes 🔹 Blockchain systems including smart contracts, tokenization, and hybrid architectures 🔹 Trading and fintech systems including data pipelines and execution workflows 🧠 How Work Is Approached 🔹 Focus on business outcomes, not just implementation 🔹 Clean, scalable architecture designed for long-term growth 🔹 Strong ownership from design to production deployment 🔹 Clear communication and fast iteration cycles Most projects start with a problem, not a clear solution. That problem is translated into a structured system and executed with reliability. 🤝 Let’s Work Together Best suited for: 🔹 Startups building products from scratch 🔹 Teams scaling systems beyond MVP 🔹 Businesses integrating AI into real workflows 🔹 Platforms requiring secure and high-performance architecture Available for long-term collaborations and high-impact projects.

I build the kind of Python systems that do the work no one wants to babysit: crypto bots, automation pipelines, and scrapers that survive real-world bot detection. Async, production-grade, built to keep running long after I hand them over. What I ship: 🤖 Telegram & Discord Bots Alert bots, price-checkers, ticket systems, admin tools, full MVPs. aiogram and discord.py. Real error handling, auto-reconnects, rate-limit aware. Bots that don't go silent when the API hiccups. 📈 Crypto Price Tracking & Algo Trading Multi-exchange price watchers, arbitrage detection, pump/dump alerters, trading bots with real strategy logic. CCXT for the easy exchanges, custom aiohttp connectors for the 40+ that CCXT can't handle cleanly. Redis-backed snapshot stores, hard timeouts, distributed locks. 🌐 Web Scraping (anti-bot ready) I pull data from sites that actively fight scrapers. undetected-chromedriver, Selenium, Beautiful Soup, Scrapy. Captchas, rotating proxies, sticky sessions, rate limits, all handled. 📊 ETL & Automation Pipelines Async Python services that ingest messy data, clean it, transform it, push it where it needs to go. Scheduled jobs, error recovery, observability built in. Runs while you sleep. 🔗 API Integrations Exchange APIs, Google Sheets, Supabase, Stripe, webhooks. I connect systems that were never meant to talk to each other and make them work cleanly. 🗄️ Databases & Infrastructure PostgreSQL, MySQL, MongoDB, Redis. SQLAlchemy with Alembic migrations. Docker, docker-compose, task queues. Built for real production load. 🚀 Most automation projects break two months in. The bot misses an event. The scraper trips on a captcha. The pipeline silently drops half the records. You don't notice until a customer does. That's the part I build for first, not last. Tell me what you're building. I'll come back within 24 hours with a real plan, a real timeline, and an honest answer on whether I'm the right fit. If your project lives in crypto or trading, I can also share a long-running production system I built privately so you can see the bar I work to.

Full-stack developer building production backends, payment systems, and AI-integrated tools. I work primarily with Python (FastAPI), TypeScript/React, PostgreSQL/Supabase, and Stripe — with hands-on Claude API integration when AI belongs in the stack, not bolted on. I ship the parts of a system that have to actually work in production: payments and webhooks, auth and access control, API integrations, deploys, and the backend logic underneath. I build for reliability — not demos. Recent production work: - Member portal with Stripe subscriptions, Apple Pay, multi-currency checkout, and Supabase- gated access. FastAPI + PostgreSQL + Railway, 5★ verified delivery - Market-data MCP server for Claude Desktop and agent clients — workflow-shaped tools, FastMCP, open source on GitHub - TradingView → Claude → Telegram approval pipeline for AI-assisted decisions with human-in-the-loop confirmation - Bybit futures bot suite: multi-symbol live execution, ATR trailing stops, backtest engine, parameter optimizer - Pine Script indicators with multi-timeframe logic and webhook integration for automated alert delivery Specialized in trading systems and Claude/MCP integration, but the core skill is shipping backends that don't break. If you're building a SaaS, integrating Stripe, wiring Claude into a workflow, or automating a trading system — happy to talk.

I'm a browser automation and anti-bot specialist with 6+ years of experience. I build scrapers and automation tools that ALWAYS work. What I do: - Bypass Cloudflare, DataDome, Akamai, PerimeterX - Fingerprint spoofing at browser level - canvas, WebGL, AudioContext, TLS/JA3, HTTP2 (3), WebRTC leaks - Reverse engineer closed web and mobile APIs - SSL pinning bypass, traffic analysis - Know exactly what commercial and open-source antidetects leak and why - Handle anything: shadow DOMs, complex captchas, WebSockets, mobile app APIs I've shipped open-source tools used by the community - a captcha-solving framework and a browser stealth benchmark. Check GitHub. If you've been told your target site "can't be scraped" - that's usually when you need me.

Ex-Capgemini senior consultant. I build production-grade data & AI systems that save you money 👋 → I saved clients €200K+ last year by (1) doing it cheaper or (2) unlocking more revenue with the same team 
 → Worked with billion dollar companies: Ducati (€1B), Kuwait Petroleum (€15B), TIM (€15B) → Doing AI since 2019 — won 2nd place in an international competition and published the research Some clients need automation that runs their entire operation — if it breaks, the company stops. Others need help figuring out what to automate first, and in what order. I've been doing both since before AI was a trend. If you want automation that actually runs your business, you're in the right place: → For Ducati I built near-real-time logistics monitoring 26,000 packages/day, and production monitoring systems ensuring zero downtime on their assembly line → For Kuwait Petroleum I built theGDPR-compliant data platform behind their fuel card loyalty program, powering personalized campaigns and churn prevention via Adobe AJO → I'm building an automation system projected to add €4M in annual capacity for road services company SMB Check my portfolio below for case studies, or try our AI chatbot at columen.eu to see our work firsthand. --- My backstory: I recently realized that the thread connecting my entire career has been automation. Which surprised me - I always felt like I was doing something fancier. Most developers come from one world or the other - startups or enterprises. I've done both. → Startups: build fast, ship fast, figure it out as you go → Enterprises: mistakes are expensive. When something breaks at a billion-euro company, it's not "we'll iterate" - it's missed revenue, it's a massive problem. Things need to work. For years I didn't see the connection. At Capgemini, building systems for Ducati and Kuwait Petroleum, I thought I was doing "business intelligence" and "data-driven decision making." In reality? I was automating reports through arbitrarily complex data pipelines. I've done two startups. First one: we thought we were building a revolutionary crypto platform. We were building automated trading. Second one: we thought we were revolutionizing tech hiring. We were automating tech candidate screening. When I started my consulting firm, I wanted to offer all kinds of sophisticated services. But the projects where clients saw real ROI - tens of thousands of dollars per year - were always automations. Complex ones that require both technical depth and understanding how businesses actually operate. That's me. Molded by startup speed and enterprise risk aversion. I've always been automating things - I just thought I was revolutionizing the world while doing it. Valerio P.S. - If you're not sure automation or AI makes sense for your situation, happy to chat anyway. Sometimes the answer is "not yet" - and knowing that saves you money.

Need a developer who actually finishes the job? Too many projects get stuck halfway or developers disappear. You won’t have that problem here. I work independently, respect deadlines, and take full ownership of the project. You get a finished, scalable solution — delivered on time. 🚀 Real projects. Real scale. Backdoor Store — serving up to 15,000 customers per month AI Trading Bot — 100,000+ registered users Both systems run reliably in production and handle real traffic. Stable architecture. Predictable performance. No chaos. 💻 What I build: • Custom web platforms • AI-powered tools and automation • Scalable backend systems • SaaS products • API integrations I focus on business outcomes — not just writing code. Confidential projects are handled professionally. NDA can be signed if required. If you need a reliable developer who delivers — let’s talk.

I'm a skilled Software Engineer specializing in building robust backend architectures and native Android applications. I have deep expertise in Java (Spring Boot & Android) and Python (FastAPI & Flask), allowing me to easily adapt to your existing tech stack. I design scalable, maintainable, and efficient solutions to solve complex business challenges. I always try to keep the transparent and clear conversation with the client by discussing the small yet critical details or offering multiple ways to implement your ideas in code. Core Expertise: - Backend & API Development: Designing production-ready RESTful APIs, microservices, and asynchronous systems using Spring Boot, FastAPI, and Flask. Experienced in code optimization and building high-performance automation tools or bots. - Native Android Development: Crafting modern, responsive, and reliable mobile applications using Java, ensuring clean architecture and seamless performance. What I Can Help You With: - Building a solid backend architecture or high-load API from scratch. - Developing a complete native Android application with a focus on performance. - Creating efficient automation bots (Telegram/Discord) integrated with complex backends. - Optimizing existing legacy code for better scalability. Let's discuss your project goals and how we can bring them to life efficiently. Drop me a message!

Senior full-stack engineer with 12 years building production software end to end — modern web frontends, the APIs and services behind them, and the infrastructure to ship and scale them. Core stack: TypeScript/React/Next.js on the front, Rust, Go, and Node.js on the back. Most full-stack developers are frontend-heavy and treat the backend as an afterthought. I'm the opposite: deep backend and distributed-systems experience, paired with a frontend I can actually build and ship myself. That means you can hand one senior person an entire product — UI to database to deployment — instead of stitching together three contractors and hoping the seams hold. Where I do my best work: • End-to-end product builds — Next.js frontends backed by Rust/Go/Node services, zero to deployed • AI/LLM applications — chat interfaces, agentic workflows, RAG pipelines, and the backend plumbing to make them reliable and cost-controlled • Backend-heavy systems — performance-critical APIs, event-driven architecture, and stabilizing services that have outgrown their original design On AI and speed: I've spent the last two years building my own tooling — including TokenPilot, a token-optimization plugin for Claude Code — and I fold modern AI workflows into client work. That buys faster prototyping and tighter iteration, but the architecture and the judgment behind it stay senior-level and hand-reviewed. The hard part of an AI product isn't the demo; it's making it hold up once real users hit it. Twelve years of backend experience is what makes the difference there. If you've got a web app, an AI product, or a backend that needs to be built right the first time — and you'd rather work with one senior engineer than coordinate a team — send me the details. I'll tell you honestly whether I'm the right fit and how I'd approach it.

🚀 Turn Manual Tasks Into Intelligent Automation I help businesses save thousands of hours by building AI-powered automation systems that work 24/7. Whether you're drowning in repetitive tasks, losing leads due to slow response times, or struggling to connect your business tools, I design custom solutions that streamline operations and boost revenue. With deep expertise in AI automation, n8n workflows, intelligent chatbots, and CRM systems, I've helped companies across the USA, Europe, UK, and Australia transform their business processes. From automated lead generation to AI voice agents that handle customer calls, I build systems that don't just work, they scale. 💼 What I Do Best AI Automation & Intelligent Workflows • Custom n8n automation connecting your entire tech stack • Multi-agent AI systems and AI assistants for internal teams • Retrieval-Augmented Generation (RAG) systems and knowledge bases • Document processing and intelligent decision-making automation • End-to-end business process automation across departments AI Chatbots & Voice Agents • 24/7 AI chatbots for websites, WhatsApp, Facebook, Instagram, and Slack • AI voice agents for inbound/outbound calls and appointment booking • Customer support automation with CRM integration • Lead qualification and sales assistants that never sleep • Multilingual conversational AI tailored to your brand CRM & Sales Automation • GoHighLevel setup, migration, and advanced workflow automation • Sales pipeline optimization and automated lead nurturing • Email, SMS, and WhatsApp automation sequences • Client onboarding workflows and conversion optimization • Third-party CRM integrations and custom API development Trading Automation • MetaTrader 4/5 Expert Advisors (EAs) with robust risk management • TradingView Pine Script indicators and automated strategies • NinjaTrader strategies and trade copiers • Algorithmic trading systems for consistent execution Custom Software & SaaS Development • AI-powered web applications and business dashboards • SaaS platforms with intelligent automation • API development and complex third-party integrations • Scalable cloud solutions built for growth ✅ Real Solutions I've Delivered ✔ Built AI customer support systems that reduced response time by 90% and handled 1,000+ inquiries monthly ✔ Created n8n automation workflows connecting CRMs, communication platforms, and databases, eliminating 30+ hours of manual work weekly ✔ Developed AI voice agents for appointment booking that increased booking rates by 40% ✔ Implemented GoHighLevel CRM systems with automated sales funnels generating consistent qualified leads ✔ Designed trading bots for MT4/MT5 and TradingView that execute strategies 24/7 with precision ✔ Launched automated lead generation systems with multi-channel follow-ups, boosting conversions by 35% ✔ Built custom SaaS platforms processing thousands of transactions monthly 🛠️ Technical Expertise Automation & AI Platforms: n8n,Make, Zapier, Lang Chain, Open AI API, Claude API CRM & Marketing: GoHighLevel (GHL), sales automation, lead generation, email/SMS campaigns Development: Python, JavaScript/Node.js, REST APIs, Webhooks, PostgreSQL, MySQL, Firebase, Supabase Trading Platforms: MetaTrader 4/5, TradingView Pine Script, NinjaTrader, algorithmic trading systems Integrations: Twilio, WhatsApp Business API, Stripe, Google Workspace, Slack, Discord, and 100+ other platforms 🎯 My Approach I don't believe in one-size-fits-all solutions. Every project starts with understanding your unique business challenges and goals. I identify bottlenecks, map out processes, and design automation that fits seamlessly into your existing operations. Whether you need a simple workflow or a complex multi-agent AI ecosystem, I build systems that are reliable, scalable, and deliver measurable ROI. 🌍 Who I Work With I partner with small to enterprise-scale businesses across the USA, Europe, UK, and Australia who are ready to: • Eliminate time-consuming manual processes • Scale operations without adding headcount • Improve customer experience with AI • Increase revenue through intelligent automation • Stay ahead of competitors with cutting-edge technology 💬 Ready To Automate? If you're tired of repetitive tasks eating up your team's time, or you're ready to implement AI that actually works for your business, let's talk. I specialize in projects $500+ and focus on delivering systems that provide long-term value. Send me a message describing your challenge. I'll respond with ideas on how we can solve it together.