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// CASES — 04

Products running in production

CRMWEB

Site + CRM for a service company

Leads from 4 channels in one funnel, auto-routing, statuses for clients in Telegram.

→ Problem: Leads were lost between Avito, the site, Telegram and calls. The dispatcher spent 3+ hours daily on manual routing.
→ Solution: Unified ingestion, auto-routing to staff, Telegram notifications to clients.
→ Result: +184% leads/mo, −60% manual work, 3 weeks to launch.
+184%
leads/mo
−60%
manual work
3 weeks
to launch
Next.jsSpring BootPostgreSQLTelegram API
BOTPAYMENTS

Subscription Telegram bot for an online school

Bot sells access, takes payments, auto-renews subscriptions.

→ Problem: Manual renewals, students forgot to pay, access was revoked manually.
→ Solution: Bot with YooKassa, auto-renewals, automatic access revocation.
→ Result: 3,200 payments/mo, 96% retention, 0 manual operations.
3 200
payments/mo
96%
retention
0
manual ops
Node.jsTelegrafYooKassaPostgreSQL
PORTALB2B

Client portal for an audit firm

Clients see their projects, stages, documents and team chat.

→ Problem: Clients didn't understand project status — daily calls and emails.
→ Solution: Portal with projects, documents, chat and timeline.
→ Result: −74% clarification emails, NPS 98%, 14 days to MVP.
−74%
emails
14 days
to MVP
98%
NPS
ReactNode.jsS3WebSockets
CRMAUTOMATION

Sales funnel automation

Leads from 4 sources, auto-routing, nurture sequence.

→ Problem: Up to 30% of leads lost per day, manual routing.
→ Solution: Unified ingestion, auto-routing, nurture.
→ Result: Conversion ×2.4, 4-min response, 7 integrations.
×2.4
conversion
4 min
response
7
integrations
Node.jsBitrix24 APIRedisRabbitMQ
ENGINEERING CONCEPTS

Systems built for real-world complexity

Examples of how we approach Java and AI architecture, from business workflows to resilient implementation.

These are illustrative concepts, not published client projects. No performance metrics or client outcomes are claimed.

Concept
JAVA · SPRING BOOT

B2B operations platform

One workspace for requests, approvals, and documents across teams and branches.

Challenge

Requests move through email, spreadsheets, and CRM. Statuses get lost, and every branch follows a different process.

Architecture

Spring Boot modular monolith, PostgreSQL, role-based access and audit trail, plus an integration layer for ERP and CRM.

Business value

A traceable path from intake to completion, with room to add workflows and integrations without rewriting the core.

Multi-tenantRBAC + auditERP / CRM
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Concept
JAVA · QUARKUS

Event-driven logistics platform

A resilient order and telemetry pipeline for field teams, unreliable networks, and traffic spikes.

Challenge

Scans and status changes can arrive late or more than once. A lost event can mean a routing or inventory error.

Architecture

Quarkus services, Kafka, idempotent consumers, event retries, PostgreSQL, and observability through OpenTelemetry.

Business value

Events survive temporary outages, while the order state can be reconstructed from a single processing history.

Event-drivenResilient deliveryKubernetes
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Concept
AI · RAG · HUMAN REVIEW

Support AI assistant with sources

The assistant searches approved knowledge, shows supporting passages, and leaves sending the reply to a human.

Challenge

Teams spend time on repeat questions, but an unsourced automated reply can damage customer trust.

Architecture

RAG over approved content, source links, tenant data isolation, sensitive-data filtering, and operator approval.

Business value

Agents can compose accurate answers faster and see the documents behind them; uncertain cases stay with the team.

Cited answersHuman-in-the-loopRole-based access
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