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Esplora
Fiverr Pro
Italiano
$
USD
Sergey K.
@sergey_kozlov01
Backend developer: Telegram bots, scrapers, automation
Georgia
Russo, Inglese
Chi sono
Hi, I'm Sergey, a backend developer (Node.js / NestJS). I build backend and integrations for a marketing team, including a lead processing service handling ~20,000 leads a day.
What I build:
- Telegram bots and Mini Apps
- Discord and Slack bots
- AI agents for lead generation
- Web scrapers and PDF / OCR data extraction
- Chrome extensions
- API integrations
I work through Fiverr chat only, no calls. Everything stays in writing, so nothing gets lost. Message me before ordering and I'll tell you honestly if your task is a good fit.
Competenze
Sergey K.
offline •
Consulta i miei servizi
Automazioni e agenti
I will build API integrations and web scrapers for your business
Chatbot basati su regole
I will build a custom telegram bot or mini app with payments
Portfolio
Esperienza lavorativa
Backend Developer (Node.js / NestJS)
Performance marketing team • Freelance
Dec 2024 - Present • 1 yr 11 mos
Backend developer for a performance marketing team. I built the team's infrastructure from scratch and own its core services. - Lead processing service: ~20,000 leads a day. Intake from landing forms, queues (Redis / BullMQ), validation, deduplication and routing to partners. - Monetization services: logic that routes traffic to partner offers and the thank-you page offerwall. - Analytics: event storage in ClickHouse, data in MongoDB, conversion tracking for ad counters. - Integrations with partners and ad platforms via REST APIs and webhooks. Stack: Node.js, TypeScript, NestJS, MongoDB, ClickHouse, Redis, BullMQ, Docker.
