Booking systems, operations automation, AI that actually holds up in production, blockchain, and security. Delivered as code you own, on infrastructure you control.
Live systems in Argentina, Mexico, Brazil, Spain, Ecuador, Italy, USA, Colombia and Ukraine.
Each one backed by systems running in production right now — not by a certificate. Pick the one closest to your problem, or send a brief and I will tell you which it actually is.
I build custom systems for service businesses. Booking and scheduling, operations automation, and AI put inside processes that already run.
Every project starts with what the business is losing today, not with a feature list.
Five systems for salons, clinics, sports venues and installation services. The problem is never the calendar.
Work that repeats every day becomes a system nobody on the team has to think about again.
Document extraction, support automation, anomaly detection on live data. Not a chatbot on a homepage.
No platform fee that grows with your customer list. No ceiling you find out about in month eight.
Stripe, Mercado Pago and PayPal wired into billing that runs without anyone watching it.
I build custom systems for service businesses. Booking and scheduling, operations automation, and AI put inside processes that already run. Every project starts with what the business is losing today, not with a feature list.
Delivered across healthcare, retail, sports, education and fintech, always as code the client owns.
Five systems for salons, clinics, sports venues and installation services. The problem is never the calendar.
Work that repeats every day becomes a system nobody on the team has to think about again.
Document extraction, support automation, anomaly detection on live data. Not a chatbot on a homepage.
No platform fee that grows with your customer list. No ceiling you find out about in month eight.
Stripe, Mercado Pago and PayPal wired into billing that runs without anyone watching it.
The tools behind the work. What matters to a client is that none of it locks them into a platform they cannot leave.
All technologies at a glance
Kyiv, Ukraine
Remote
Every one of these started as a business losing time or money somewhere specific. The technology was the answer, not the point.
A ticketing operator was renting its platform. The own 2D canvas seat-map engine runs at 39fps on 10k+ seats, and the operator owns it now.
ArTicket needed a self-hosted omnichannel support desk. 7 email mailboxes plus WhatsApp, Facebook, Instagram and web widget for 8 agents, nightly backups.
A composites shop was renting an AI assistant. Their own Claude-powered agent now handles sales across 5 channels, with hard guards against price hallucination.
Elderly SOS pendants used to call the family. Now they ping a 24/7 call center and every family member in real time, live on iOS and Android.
A surgeon wanted a website that generates patients through Google. 40+ SEO pages, inline CMS the doctor edits live, CFM-compliant medical content.
Made-to-measure cold rooms could not be quoted online. A configurator embedded via Shadow DOM reads the real closed prices and adds to cart, no iframe.
A production mail server was actively compromised. Malware eradicated, CVE-2024-45519 patched with a custom Perl fix, and weekly SOC monitoring took over.
Sports centres could not share courts across a reseller network without double-booking. Atomic tenant-isolated booking with commission accounting handles it.
Banking statement PDFs were parsed by hand across dozens of accounts. Streamlit MVP now extracts and cross-references transactions automatically.
Cattle fields were checked on foot at dawn. Sensor telemetry over MQTT/HTTP fires WhatsApp alerts when a threshold breaks, before anyone leaves the house.
Affiliate posting on Pinterest hits rate limits and bans fast. A 24/7 bot with intelligent frequency controls keeps the account safe long-term.
The first pilot for cattle-field monitoring. Backend, WhatsApp notifications and per-user data separation, before the M2 platform scaled it up.
21 Angular front-end components had to hit a GraphQL backend and stay pixel-perfect against Figma. Refactor, interactive map and dashboard all shipped.
Authors buying Amazon reviews got flagged in bulk. Weekly automatic queue delivery, reader anonymity, 72h deadlines and 14-day replacement — no flags.
A mobile app needed to survive real attackers, not a checklist. Cryptography, pentesting and secure authentication baked into every layer, iOS and Android.
A wholesaler was running its POS blind to accounting. An ERP layered over the SQL Server POS shows a live balance sheet and files AFIP invoices.
A crypto dashboard needed a currency toggle and a rate updater without redeploys. Direct hire from a returning client added both without touching production.
No-shows are the quiet cost of every appointment business. Reminders reach clients on WhatsApp, and a cancelled slot gets offered again.
Selling cars on 6 Brazilian portals meant 6 manual re-postings a day. Laravel API integrations sync each platform automatically and stay reliable.
A crypto investment dashboard needed Web3 wallet integration and live token APIs. Key features optimized, new integrations added without breaking the panel.
SMBs (delivery, barbershops, clinics, retail) needed a WhatsApp assistant with STT and per-client JSON config. MVP built for stability over intelligence.
Tracking stocks and foreign-currency investments across accounts was scattered. Consolidated wealth view with per-asset tracking and currency conversion.
An AI-industry site needed a futuristic redesign and technical SEO. UI/UX overhauled, structure and load speed optimized, mobile compatibility fixed.
An ESG plastic-credit protocol needed dynamic weekly pricing and a 5/45/50 vesting rule on-chain. Stripe Split handles automated commission distribution.
A single-lesson pilot needed to prove the interaction model before scaling. Multiple-choice mechanics, lesson import system and lightweight CMS designed.
A new token needed a smart contract and a presale API wired into the existing site. Full implementation guaranteed API security and correct token interaction.
Water treatment failures were found after the damage, through paper reports. AI now surfaces anomalies from live data while they are still cheap to fix.
Finding a medicine in stock meant calling pharmacies one at a time. Google Maps + Street View + radius search + data scraping built the map.
Traders leave when the price moves between the click and the fill. Sub-second execution on Solana keeps the order book worth using.
A Solana DEX mobile app needed adjustments and new features on iOS and Android. High-speed EBK + SPL token swaps with minimal fees.
Real-time swap events on Uniswap V2 needed a Node.js scanner. The Graph subgraph + ethers RPC log scanning fed analytics and alerts.
A strategy only earns if it runs the same way every time, including at 3am and during bad news. The bot holds the rules and the risk limits.
Stablecoins, tokens and exchanges. Money moves through these systems, so the security model gets decided before the first line of code.
Polygon PoS + Chainlink
A stablecoin is only trusted if anyone can check the reserves at any moment. Chainlink Functions verifies them in real time.
Multiple Clients
Tokens carrying real value need clear permissions and a stop button before launch, not after the first incident.
SPL Token Exchange
Traders abandon an exchange that lags. Sub-second execution is what keeps volume on the book.
Polygon PoS + Chainlink
A stablecoin is only trusted if anyone can check the reserves at any moment. Chainlink Functions verifies them in real time.
Multiple Clients
Tokens carrying real value need clear permissions and a stop button before launch, not after the first incident.
SPL Token Exchange
Traders abandon an exchange that lags. Sub-second execution is what keeps volume on the book.
AI put inside operations that already run. Document extraction, support automation, anomaly detection on live data.
Editing passes and course recommendations that used to require a person reading every line.
Clients send voice notes on WhatsApp. The booking gets made without staff listening to any of them.
Pipelines that let a system answer from the company documents it was given, instead of guessing.
Voice messages turned into text the system can act on, so support stops being a listening job.
Image generation built into tools clients use directly, without a designer in the loop for every asset.
AI belongs where the work already happens, not bolted on at the end. I decide that on day one, with the client, before anything is built.
Editing passes and course recommendations that used to require a person reading every line.
Clients send voice notes on WhatsApp. The booking gets made without staff listening to any of them.
Pipelines that let a system answer from the company documents it was given, instead of guessing.
Voice messages turned into text the system can act on, so support stops being a listening job.
Image generation built into tools clients use directly, without a designer in the loop for every asset.
AI belongs where the work already happens, not bolted on at the end. I decide that on day one, with the client, before anything is built.
MetaTrader 5 · Python Automation
A strategy only earns if it runs the same way every time, including at 3am and during bad news. The bot holds the rules and the risk limits so the decision never depends on how the day is going. Separate buy and sell engines keep the logic clean and the performance of each one visible.
Interface preview with sample values. Real figures depend on the strategy, the instrument and the account.
Reviews left by the people who paid for the work. Nothing here was written by me.
Ustym is a top-tier professional. He is highly reliable, communicates effectively, and delivers high-quality work consistently on time. He is proactive, he does not just execute tasks but thinks ahead to provide the best solutions for the business. A true partner you can trust with your vision.
He is not just a developer, but a high-level technical partner able to engineer complex ESG and fintech solutions from scratch. He turned sophisticated industrial logic into a fluid digital platform. He bridges the gap between complex business requirements and clean, functional code.
Every stage was delivered with precision and care, inside deadlines I did not think were possible. His dedication cut my waiting time by 99%, which saved me money and let me go live far sooner, starting to profit almost immediately.
He made Agendux the complete SaaS appointment booking platform I envisioned, fully functional, stable and production-ready. What impressed me most was his ability to solve complex technical challenges. He was always responsive and transparent, and he far exceeded the original scope.
From the first contact he was extremely helpful, patient and professional. What I liked most was his commitment to delivering work that is genuinely well done. The result was exactly as I imagined it, and the whole process was calmer thanks to his dedication.
He quickly understood the existing system, validated the lesson logic, and improved the interaction flow with a clear, structured approach. He designed a clean, database-friendly content structure that makes future imports straightforward. Well executed and delivered on time.
Ustym is a very talented freelancer. He finished the project accurately and with surprising speed. I want to work with him again if I get the chance.
Reliable, honest and fast developer. He gave solutions that were coherent with the project. Thank you.
Very competent, dedicated and committed to delivery. He showed technical command, organisation and good communication throughout. The work went beyond expectations while always respecting the resources I had available.
He delivered ahead of schedule, with perfect technical results and a clear understanding of the requirements. The final result was accurate, clean and fully functional, showing great attention to detail and a truly professional approach.
He completed the project with excellence, replies very quickly, makes every step of the execution clear, and shows deep knowledge of the subject.
Working with Ustym is very easy. He understands everything perfectly and he applies it very quickly.
Very agile and fast, effective and to the point, even on complex work.
I was very satisfied with Ustym’s work. Excellent professional, fast, competent and very efficient. Recommended.
He built a fully functional store from a local Microsoft SQL Server instance. Impressive work. I hope we can keep working together.
Excellent professional. Fast, polite, great work. Recommended.
Ustym is a top-tier professional. He is highly reliable, communicates effectively, and delivers high-quality work consistently on time. He is proactive, he does not just execute tasks but thinks ahead to provide the best solutions for the business. A true partner you can trust with your vision.
He is not just a developer, but a high-level technical partner able to engineer complex ESG and fintech solutions from scratch. He turned sophisticated industrial logic into a fluid digital platform. He bridges the gap between complex business requirements and clean, functional code.
Every stage was delivered with precision and care, inside deadlines I did not think were possible. His dedication cut my waiting time by 99%, which saved me money and let me go live far sooner, starting to profit almost immediately.
He made Agendux the complete SaaS appointment booking platform I envisioned, fully functional, stable and production-ready. What impressed me most was his ability to solve complex technical challenges. He was always responsive and transparent, and he far exceeded the original scope.
From the first contact he was extremely helpful, patient and professional. What I liked most was his commitment to delivering work that is genuinely well done. The result was exactly as I imagined it, and the whole process was calmer thanks to his dedication.
He quickly understood the existing system, validated the lesson logic, and improved the interaction flow with a clear, structured approach. He designed a clean, database-friendly content structure that makes future imports straightforward. Well executed and delivered on time.
Ustym is a very talented freelancer. He finished the project accurately and with surprising speed. I want to work with him again if I get the chance.
Reliable, honest and fast developer. He gave solutions that were coherent with the project. Thank you.
Very competent, dedicated and committed to delivery. He showed technical command, organisation and good communication throughout. The work went beyond expectations while always respecting the resources I had available.
He delivered ahead of schedule, with perfect technical results and a clear understanding of the requirements. The final result was accurate, clean and fully functional, showing great attention to detail and a truly professional approach.
He completed the project with excellence, replies very quickly, makes every step of the execution clear, and shows deep knowledge of the subject.
Working with Ustym is very easy. He understands everything perfectly and he applies it very quickly.
Very agile and fast, effective and to the point, even on complex work.
I was very satisfied with Ustym’s work. Excellent professional, fast, competent and very efficient. Recommended.
He built a fully functional store from a local Microsoft SQL Server instance. Impressive work. I hope we can keep working together.
Excellent professional. Fast, polite, great work. Recommended.
Verified reviews from Workana. Quotes left in Portuguese, Spanish and Italian were translated into English, originals unchanged on the platform.
Statistics · Kyiv, Ukraine
Strong foundation in algorithms, data structures, computer networks, databases and software engineering principles, applied across 8+ years of professional work.
Certified Blockchain Developer
JavaScript Algorithms & Data Structures
freeCodeCamp – Responsive Web Design
Keeping up with the latest in AI/LLMs, zero-knowledge proofs, Layer 2 scaling solutions, and modern React patterns.
Professional Working Proficiency
Native Speaker
Tell me what the business is losing today and I will tell you whether software fixes it. I work in your hours and I answer in writing.
Open to remote opportunities worldwide