Mihail Iavian

Full-stack development for a B2B telecom (MVNO) platform. • Rails backend services: B2B API, orders, SIM inventory, audit logging • Event-driven architecture on RabbitMQ across ~10 services • Billing and traffic pipelines: usage data from ClickHouse into the ERP, invoice reconciliation • ERP integration and major version migration • React frontend of the B2B customer portal • Test coverage and staged Ruby 3.1 to 4.0 upgrade • Docker, Kubernetes, Jenkins CI, ClickHouse, PostgreSQL/MySQL

Full-stack development of a payment processing platform (merchant deposits and payouts). • Rails 7 backend: payment state machines, merchant REST API with OpenAPI docs, role-based access, 2FA • Multi-currency balances, exchange rates, operator matching, dispute flows • Background jobs on Sidekiq and Redis (idempotent, unique) • Back office: search and filtering, reporting dashboards, Excel exports • Frontend with Hotwire (Turbo, Stimulus) • PostgreSQL, Docker, Sentry, Kamal deployments

Backend development for a flight-delay compensation service (EU 261 claims) operating across Scandinavia and Europe. • Ruby on Rails backend, Sidekiq background jobs, MySQL • Claim processing pipeline: intake, deadlines, status tracking, payouts • Integrations with partner law firms in several countries for court proceedings • Zendesk integration for customer and airline correspondence

Development of an internal smart metering system for a national energy utility. • Ruby on Rails backend for collecting consumption data from smart electricity meters • Processing of metering data flows: validation, aggregation, internal reporting • Integration with metering equipment and internal utility systems

IT infrastructure support at a regional gas distribution company. • Administration of the corporate network • Maintenance and configuration of user workstations and office equipment • Hardware and software installation, upgrades and troubleshooting • Day-to-day IT support for company staff

IT infrastructure support and system administration. • Administration of the corporate network and user workstations • Hardware and software installation, upgrades and troubleshooting • Day-to-day IT support for company staff