Eldiyar — Senior Backend / Node.js Engineer

// PROFILE

Senior Backend Software Engineer with over 6 years of experience designing high-load distributed systems, Highload, FinTech, Web3, RMM, AI solutions, and real-time infrastructure. Specialize in backend system architecture, Event-Driven Architecture, microservices, low-latency data processing, and scaling services to hundreds of millions of requests per day.

Over recent years, I have contributed to the development of crypto exchanges, payment platforms, IoT SaaS, AI services, and algorithmic trading systems. My solutions have cut business operational costs by up to 90%, reduced processing times from hours to seconds, decreased false trading signals by 50%, delivered 3000+ RPS processing, and maintained a 99.99% SLA under high load.

My core strength is system design. I design architecture with scalability, fault tolerance, observability, technical debt management, and long-term product maintainability in mind. I apply Domain-Driven Design, Clean Architecture, Event-Driven approaches, CQRS-like patterns, CI/CD, and engineering excellence practices. Beyond development, I actively contribute to technical leadership, architectural decision-making, Code Reviews, engineer mentoring, and translating complex business requirements into scalable engineering solutions.

// ARSENAL

// MISSION LOG

• MAY 2026 — PRESENT
  Founding Software Engineer Independent IT Contractor
  Deterministic algorithmic trading engine based on a trend-following strategy for the BTC futures market, along with a multi-agent AI-powered market analytics system built on n8n, integrating LLMs, TimeGPT, and external data providers.
  • Designed a deterministic BTC futures trend-following engine with a 6-factor scoring model, PIT-MAD normalization, regime classifier and HTF consensus gate; reduced false signals by 50%
  • Built a real-time Binance WebSocket pipeline for order books, trades and liquidations with in-memory quant metrics and Funding Z-score calculation in Redis; reduced PostgreSQL load by 90% with 99.99% uptime
  • Implemented Carver volatility targeting, dynamic position sizing, 15 pre-trade risk guards, circuit breakers and an 8-scenario exit matrix to cap daily drawdown at 3%
  • Created a fault-tolerant CCXT execution engine with Limit → Re-quote → IOC → Market escalation and per-symbol Redis locks to remove race conditions during extreme volatility
  • Designed an event-driven analytics architecture with 12+ microservices on Redis Streams and n8n, reducing report generation from 30–60 minutes to 10–15 seconds
  • Built a hierarchical multi-agent GPT-5 analysis layer via OpenRouter with parallel orchestration of 7 modules, local TimeGPT, Matrix Profile and custom JS technical indicators
  • Implemented an asynchronous N×M real-time sentiment analysis module for news feeds via GPT-4o, automatically matching aggregated context against active market orders
  • Deployed an observability stack (Pino JSON, Promtail, Grafana Cloud Loki) and an LLM-powered Telegram control interface, ensuring transparent auditing of AI agent behavior and cutting production validation time for new prompts
  stack: Node.js · Bun · TypeScript · Python · PostgreSQL/TimescaleDB · Redis · CCXT · n8n · OpenAI API · OpenRouter · TimeGPT · Grafana Cloud · Linux
• DEC 2025 — MAY 2026 · 6 MO
  Senior Software Engineer Independent IT Contractor
  Web3/FinTech ecosystem: decentralized multichain DEX interfaces (15+ EVM/non-EVM networks), real-time monitoring of on-chain events, liquidity, and price quotes (REST API, WebSocket). Backend platforms for automating multichain deposits and B2B/B2C SaaS services focused on transaction cost optimization (TRON energy rental, EVM gas management). Full-cycle crypto operations processing: real-time monitoring, transaction execution, and automated fund distribution across custodial wallets.
  • Designed a Clean Architecture payment core on Encore.ts microservices, processing 3,000+ RPS and 100M+ requests per day with 99.99% uptime
  • Built a high-performance WebSocket engine and ingestion system for parallel on-chain data streaming across 15+ EVM and non-EVM networks
  • Reduced public RPC node pressure by 70% through two-level Redis caching and brought market data latency below 200 ms
  • Implemented sweep-on-deposit automation with TRON energy rental and dynamic EVM gas top-ups, cutting on-chain operating fees by 90%
  • Created an event-driven transaction tracking pipeline for 3M+ multichain wallets with parallel deposit splitting and concurrent nonce tracking; reduced settlement latency to 2–3 seconds
  • Hardened the custodial layer against MEV and front-running attacks and implemented Web3 signatures, HMAC and AES-256 authorization protocols
  • Deployed a local testing environment with isolated protocol nodes for BTC, ETH, and TRON, and built a testing pyramid (unit/component/e2e) securing 80% coverage of critical paths and enabling zero-downtime releases
  stack: Web3 · NestJS · Encore.ts · Redis · PostgreSQL · TRON · EVM · Highload · Gas Optimization · MEV Protection · Event-Driven Architecture
• DEC 2024 — DEC 2025 · 1 YR
  FullStack Software Engineer Independent IT Contractor
  A regulated OTC platform for exchanging crypto assets (USDT, BTC, ETH) for fiat currency (USD, KGS) with a full-cycle KYC/AML workflow, banking settlement, and an operational dashboard for managers.
  • Designed and implemented a state machine for deal lifecycle management and RBAC, reducing request processing time from 3 hours to 3 minutes
  • Built a DDD modular monolith and API-first pipeline with generated frontend types, eliminating contract errors during integration
  • Implemented a pricing engine with Redis caching for external quotes refreshed every 5–30 seconds, minimizing paid data-provider API costs
  • Integrated an end-to-end KYC/AML workflow for wallet screening and counterparty identification, plus MFA, session invalidation and webhook verification
  • Built Web3 wallet authorization and localization architecture for 8 language zones to support regional product expansion
  stack: NestJS · React.js · Redux · PostgreSQL · Redis · State Machine · RBAC · KYC/AML · tRPC · DDD · Web3.js · API-First
• NOV 2023 — NOV 2024 · 1 YR
  Senior Software Engineer Devprom Software
  Real-time AI interpretation and streaming platform for international conferences, webinars, and hybrid events. The system enables live speech capture, sub-second speech recognition, translation into 50+ languages, and delivery of synthesized audio streams to thousands of concurrent listeners. Also designed an RMM & Command and Control (C2) platform for centralized management of distributed edge agents and Red Team operations. The architecture includes a real-time Control Plane, secure communication channels (TCP/WebSocket, SOCKS5), automated agent build pipeline, multi-tenant web console, and reverse proxy/tunneling infrastructure.
  • Built multi-tenant media-session isolation on OpenResty, Redis and PM2 with a dedicated Node.js process per room, supporting 10,000+ WebSocket connections
  • Designed an event-driven AI-provider integration bus for OpenAI, Deepgram and ElevenLabs with caching and fan-out deduplication; reduced latency below 250 ms and API costs by 40%
  • Implemented background audio streaming for Safari/iOS through Web Audio API and silent audio to keep playback uninterrupted with the screen off
  • Delivered hot switching across 50+ languages without packet loss or WebSocket reconnects and brought the MVP to production
  • Designed a high-load Node.js/Redis TCP/WebSocket Control Plane for real-time orchestration and broadcast command execution across thousands of edge devices
  • Built Red Team infrastructure with SOCKS5, reverse proxy, remote shell, AES-256 encryption and RBAC in a secure multi-tenant environment
  stack: Node.js · React.js · Real-time Streaming · TCP/WebSocket · OpenResty · Redis · LLM Integration · SOCKS5 · Reverse Proxy · AES-256-GCM · RBAC · C2/RMM
• JAN 2023 — NOV 2023 · 11 MO
  Senior Software Engineer Devprom Software
  An end-to-end content pipeline for high-volume digitalization and distribution of books: automated scraping of publisher catalogs, structured data extraction via external APIs, multimedia content normalization, and headless generation of print-ready PDF editions.
  • Designed and launched an end-to-end aggregation pipeline for autonomous import, normalization and headless generation of 4,000+ publishing catalog SKUs
  • Built a resilient download orchestrator on Bun with 64 isolated workers, in-memory caching and checkpoint resume, increasing throughput by 10x
  • Implemented file-locking and idempotent restart mechanics to remove manual recovery work and reduce progress loss to 0%
  • Created a CPU/GPU-scalable Sharp and FFmpeg batch pipeline for media compression, reducing storage volume by 50% without visual quality loss
  • Led the CKEditor v4 → v5 migration with TypeScript refactoring and custom plugin architecture
  • Organized decentralized P2P data replication through Tailscale and Syncthing, eliminating dependency on commercial cloud egress
  stack: Playwright · Chromium · Bun · Batch Processing · Media Optimization · Node.js · P2P Networks · Cheerio · Python · FFmpeg · CKEditor v4/v5
• AUG 2021 — DEC 2022 · 1 YR 5 MO
  Backend Node.js Engineer aQsis
  A cloud B2B SaaS platform for managing a distributed fleet of IoT terminals for vending machines: online transaction fiscalization, remote device configuration, payment acquiring, service route automation, and real-time sales analytics.
  • Designed the event-driven core of a multi-tenant IoT SaaS platform for vending terminals, fiscalization, remote configuration, acquiring, route automation and real-time sales analytics
  • Built messaging infrastructure with Apache Kafka and NATS reaching up to 60,000 RPS and guaranteed asynchronous delivery between business domains
  • Standardized API contracts and collaborated on scoping and estimation with Frontend and QA teams, reducing release-stage integration defects
  • Optimized PostgreSQL storage across 60+ tables and an 8-level hierarchy to speed up analytical queries
  • Implemented a bidirectional IoT terminal communication protocol, enabling automatic 54-FZ fiscalization for 99% of transactions without operator intervention
  • Introduced mentoring and code review practices that accelerated backend onboarding and improved engineering quality
  stack: TypeScript · Node.js · Microservices · PostgreSQL · Redis · Apache Kafka · NATS · RabbitMQ · Docker · ELK · Jenkins · GitLab CI/CD · Moleculer.js · Adonis.js
• AUG 2021 — FEB 2023 · 1 YR 7 MO
  Full Stack JavaScript & Golang Mentor SkillFactory
  Provided technical mentoring, upskilling, and curriculum management for Senior/Middle engineers studying Full Stack JavaScript and Golang. Taught the design of fault-tolerant microservice architectures, industry-standard development practices, deep Code Reviews, and efficient team Git workflows.
  • Mentored Junior, Middle and Senior developers across Full Stack JavaScript and Golang tracks, covering industrial development practices, Linux setup and team Git workflows
  • Conducted 100+ deep code reviews, helping improve code quality, React/NestJS application architecture and Golang microservice performance
  • Designed and delivered practical workshops on distributed systems, databases and backend platform security
  stack: JavaScript · React · Golang · Node.js · NestJS · Linux · Git · GitHub
• NOV 2019 — AUG 2021 · 1 YR 10 MO
  Full Stack / Mobile (React Native) Developer Sedi
  HRM time and attendance management system featuring a Golang backend, React-based admin dashboard, React Native mobile application, and employee biometric verification powered by AWS Rekognition.
  • Designed and launched an HRM time-tracking system from scratch with a Golang backend, MySQL database, React admin panel and React Native mobile app
  • Integrated AWS Rekognition biometric verification to automate facial check-ins and reduce attendance fraud
  • Built the React/TypeScript frontend for a B2B billboard management platform with reusable UI components and optimized Redux state management
  • Created an Ionic + React PWA for taxi ordering with bundle-size optimization and aggressive caching for stable 2G/3G operation
  • Migrated legacy projects to TypeScript, reduced production runtime errors and optimized slow MySQL queries and indexes under growing user load
  stack: Golang · JavaScript · React · React Native · Redux · NativeBase · MySQL · AWS Rekognition · Linux · Git · PWA · TypeScript

// UPLINK