Arsalan Naguslaev

Contracted via LLC Bitorix / NDA entity • Contributed to the evolution of fintech and compliance-related backend systems in a high-load crypto platform. • Designed and delivered backend solutions for onboarding, transaction processing, and risk-related workflows, including mobile number verification with scam intelligence checks and geolocation-based user lookup services. • Developed a dynamic Bitcoin on-chain fee calculation flow, improving flexibility and maintainability of transaction cost handling. • Expanded blockchain-related platform capabilities by integrating Tron energy rental functionality and related backend workflows. • Improved transaction monitoring and wallet infrastructure by enhancing KYT integrations and refining BitGo-related flows, including UTXO handling and consolidation logic. • Led backend changes aimed at increasing privacy and operational consistency, including the removal of phone numbers from registration and verification-related systems and implementation of automated account maintenance fee processing. • Contributed to greater transparency and operational predictability across financial and compliance flows through targeted improvements in backend logic and system behavior. Stack: PHP/Laravel monolith, Go microservices, Python/Django, Java, PostgreSQL, MongoDB, Redis, Kafka/Zookeeper, Beanstalkd, k9s, ELK, Prometheus, Grafana

• Improved architecture of delivery-related backend integrations by evolving interaction patterns with external delivery services. • Designed and implemented a delivery gateway service extracted from the monolith, contributing to clearer service boundaries and more maintainable integration logic. • Developed a reusable delivery methods library with multilingual support, helping standardize delivery-related logic across product flows. • Contributed to modularization of logistics-related backend systems, improving maintainability and clarity of integration boundaries. Stack: Go, C++, Userver, PostgreSQL, Pytest, ELK, Grafana

• Led a 10-person cross-functional team of analysts, developers, DevOps engineers, and QA. • Established team delivery processes based on Scrum and introduced engineering standards covering workflow, code quality, and review practices. • Defined and executed a roadmap for backend architecture refactoring and migration toward a microservices-oriented scheme. • Identified delivery and system bottlenecks, translated them into technical initiatives, and aligned implementation with SLA-driven support processes. • Improved engineering effectiveness by introducing CI quality checks, optimizing build workflows, and formalizing release policies. • Increased delivery predictability and reduced routine feature lead time from months to days through process standardization and tighter coordination between development and support lines. Stack: PHP, Laravel, Symfony, MySQL, Redis, RabbitMQ, ELK, OpenShift, CI/CD, Shell Scripting

• Improved onboarding and verification-related backend flows, including Sumsub integration across registration and review pipelines. • Improved service observability by building Datadog dashboards and integrating Prometheus scrapers for operational metrics collection. • Supported modernization of the PHP codebase through version upgrade work and related maintainability improvements. • Introduced code quality tooling and code style checks to improve engineering consistency. • Resolved issues in verification-related flows, increasing stability of onboarding and account-check processes. Stack: PHP, Laravel, PostgreSQL, Redis, ELK, Datadog, Prometheus, Grafana

• Implemented WebSocket-based functionality using Centrifugo, including real-time messaging, forced logout, and alert delivery. • Developed backend functionality for product services and internal tools, including business logic changes and integration-related tasks. • Supported production issue resolution and incremental codebase refactoring to improve maintainability. Stack: PHP, Yii1/2, MySQL, Redis, Centrifugo, ELK, Grafana

• Developed backend functionality for internal platform features and service integrations. • Supported production systems through bug fixing, maintenance, and incremental refactoring. • Contributed to feature delivery and day-to-day operational reliability of backend services. Stack: PHP, MySQL, Redis, ELK, Grafana