Artem Lomakin

Backend Engineer working on an online casino platform, focused on building and maintaining core gaming and financial infrastructure. Responsibilities & impact: - Design and implementation of an authentication & authorization system: session management, JWT token rotation, and multi-factor authentication flows; - Built an end-to-end observability and telemetry pipeline using OpenTelemetry: custom spans, metrics instrumentation, and collector configuration for incident detection and system health monitoring; - Development of a fault-tolerant financial ledger ensuring correctness and consistency of balance operations under concurrent player transactions with full audit trail support; - Engineering a real-time statistics aggregator processing high-volume game event streams and materializing aggregates for reporting and analytics endpoints; - Architecture and implementation of a high-throughput live game feed with low-latency event broadcasting via WebSockets, supporting thousands of concurrent connections during peak load; - Participation in architecture decisions, performance profiling, and improving overall system reliability and scalability.

Backend Engineer working on a cryptocurrency exchange, focused on building and maintaining core financial and trading services. Responsibilities & impact: - Design and development of financial services: balances, transactions, accounting logic, and settlement flows; - Implementation of high-load backend systems for trading and payment processing; - Development of wallet and payment integrations (deposits, withdrawals, on-chain & off-chain flows); - Ensuring data consistency, correctness, and fault tolerance in financial operations; - Working with concurrency, synchronization, and performance-critical components; - Integration with internal and external services (risk, compliance, payments, blockchain nodes); - Participation in architecture decisions and improving system reliability and scalability.

My freelance work has involved developing a variety of projects. Here are the ones I’m allowed to describe and share publicly: - new website for the hosting provider xorek.cloud, including an admin panel for content management; - billing system and VM management panel with hourly billing, a referral program, and full hosting-provider billing functionality; - automated complaint handling system for clients; - dozens of scripts automating business processes; - complete software suite for an online payment service in a SaaS format; - SaaS referral program; - website and personal account system for the Unturned game server (project "WhyMe?"); - new website and personal account system for a Minecraft game server (project "SideMC"). There are also other cases I cannot publicly describe, but I can discuss them in general terms during a private conversation.

Full Stack Engineer working on a high-risk payment processing platform, responsible for end-to-end development of a payment system built on a microservices architecture. Responsibilities & achievements: - Designed and implemented a microservices-based payment processing system from scratch - Developed high-performance backend services using Node.js with uWebSockets for low-latency and high-throughput processing - Implemented core payment flows: authorization, processing, callbacks, and status reconciliation - Built and maintained Backoffice systems for operations, monitoring, and manual review using PHP (Laravel) - Designed and optimized PostgreSQL schemas for transactional and financial data - Ensured reliability, fault tolerance, and data consistency in high-risk payment scenarios - Integrated with external payment providers and PSPs, handling edge cases and failure scenarios - Worked closely with risk and operations requirements specific to high-risk merchants Tech stack Backend: Node.js (uWebSockets), PHP (Laravel), Kafka Databases: PostgreSQL Architecture: Microservices

Development of a billing system and an admin panel from scratch, automation of dedicated server provisioning for clients (automating OS installation and network configuration), and an administrative panel for staff.