Full bio (About)
Kostiantyn Chaiun specializes in building Telegram bots and automating operational workflows. His focus is turning routine, error-prone tasks into transparent, measurable flows: lead generation, sales funnels, bookings & payments, logistics, customer support, internal policies, reporting, and analytics.
Kostiantyn combines engineering rigor (architecture, security, testing) with product thinking (metrics, usability, scalability). He starts from the business goal: maps the process (BPMN/diagrams), formalizes rules, selects tech and integrations, ships an MVP, measures the key metrics, and iterates. Every project comes with documentation (requirements, diagrams, Swagger/OpenAPI), team instructions, and monitoring to ensure stability.
He works with online education, e-commerce, local services, infobusiness, and SaaS. Kostiantyn sets up CRM and payment integrations, notifications, reporting, roles & permissions, and moves workflows from “spreadsheets and chats” into managed, automated scenarios inside Telegram and connected systems.
Skills & Tech Stack
Languages & Platforms
Python (FastAPI/Flask, aiogram/Telethon), Node.js/TypeScript (Telegraf, NestJS)
SQL/NoSQL: PostgreSQL, MySQL, MongoDB; caching: Redis
Queues & background jobs: Celery/RQ/RabbitMQ
Integrations: REST/Webhooks, OAuth/JWT, webhook signatures
Telegram & Automation
Telegram Bot API, Inline mode, Keyboards, Web Apps/Mini Apps
Payments (where available): TG Payments/Web checkout, invoices, billing
Funnels: lead magnets, quizzes, auto-messaging, segmentation, triggers
Auto-support: answer bases, operator escalation, SLA logic
Document flows: requests/invoices/acts, file uploads, statuses & routing
n8n/Make/Zapier: no-code integrations and custom nodes
Integrations: amoCRM/Bitrix24/HubSpot, Notion/Airtable/Google Sheets, Slack/Discord
Payments & Finance
Stripe, Fondy, LiqPay, WayForPay, PayPal (invoices/checkout/webhooks)
Subscriptions, trials, duplicate-charge prevention, refund workflows
Transaction logging, reconciliation, report exports
DevOps & Quality
Docker/Docker Compose, GitHub Actions (CI/CD)
Monitoring & alerting: Sentry, Prometheus/Grafana, logging
Testing: Pytest/Jest, load testing, canary releases
Security: roles/permissions, secret storage, encryption, GDPR-minded handling
Data & AI (as needed)
ETL/replication to DWH, dashboards (Metabase, Superset)
LLM/AI assistants in bots (request handling, classification, summarization)
Why it helps your business (benefits of working with Kostiantyn)
Business-oriented architecture. Built around metrics (leads, conversions, support AHT, LTV/churn) rather than a random feature list.
Automation from process map to release. Formalized policies, diagrams, specs, MVP, docs, and team training.
Reliability & predictability. Tests, monitoring, event logs, alerts — fewer manual checks and “fire drills.”
Integrations without drama. CRM, payments, sheets, inventory, service desk — with proper webhooks/limits/retries.
Scalability. Queues, caching, schema versioning, feature flags — safe to grow traffic and scope.
Transparency. Clear instructions, checklists, and diagrams — systems live inside the company, not only “in the dev’s head.”
Security & compliance. Access controls, secret management, sensible data practices.
Support & improvements. Post-release sprints, feedback loops, A/B ideas to lift conversion and reduce costs.
Typical deliverables
Lead-gen & quiz bots with qualification and auto-write to CRM.
In-Telegram sales: catalog, cart, invoices, statuses, manager chat.
Support/Service Desk: FAQ + escalations, prioritization, SLAs, reporting.
Internal team bots: leave/purchase requests, approvals, alerts, checklists.
Accounting & reporting: automated KPI collection and exports for finance/marketing.
Workflow (at a glance)
Diagnostics: goals, metrics, pain points, process map.
Design: specs, diagrams, prototypes, integration plan.
MVP build: short iterations, demos, feedback.
Launch: documentation, team onboarding, monitoring.
Improvements: metrics, experiments, scaling.
Engagement models
Turnkey project. From analysis to launch and maintenance.
Iterative growth. Improvement backlog, retainer/support.
Audit & architecture. Review of the current system and a practical roadmap.
Short version (for site/card)
I build Telegram bots and automate business processes: sales, support, bookings, payments, reporting, and CRM/accounting integrations. I deliver robust architecture, clear specs, and documentation, with monitoring and alerts. Projects go live “ready to run” — with metrics, logs, and a growth plan.
