Vladislav K.

Senior Software Engineer and Technical Consultant with 15+ years of experience designing, modernizing, and troubleshooting production software systems. Specializing in backend and API engineering, distributed systems, AWS, databases, performance and scalability, and software architecture. Experienced in taking ownership of complex technical problems, modernizing legacy systems, and delivering business-critical platforms. Backend & API Engineering: Design and development of production-grade backend applications and APIs using modern PHP, Symfony, Laravel, Node.js, and TypeScript, including both framework-based and custom implementations. Extensive experience with REST and GraphQL APIs, API contract and schema design, versioning, backward compatibility, pagination, integration patterns, and OpenAPI specifications. Distributed Systems & Software Architecture: Design and implementation of scalable microservice, service-oriented, and event-driven architectures. Strong experience with asynchronous processing, messaging, eventual consistency, idempotency, retry and failure-handling strategies, service boundaries, distributed workflows, and pragmatic architectural decision-making. AWS & Cloud Engineering: Hands-on experience designing, deploying, and operating cloud-based systems on AWS using EC2, ECS, RDS, DynamoDB, SQS, SNS, EventBridge, S3, and related services, including containerized deployments, infrastructure automation, and cloud-native application design. Databases, Caching & Data Performance: Data modelling, database architecture, query optimization, bottleneck analysis, and performance tuning across PostgreSQL, MySQL, MariaDB, DynamoDB, and SingleStore. Extensive use of Redis and Memcached for caching, distributed state, and application performance optimization. Performance, Scalability & Observability: Application profiling, load testing, capacity and bottleneck analysis, API and database performance optimization, caching strategies, production troubleshooting, log analysis, monitoring, and reliability improvements using Datadog and New Relic. Application & API Security: Design and implementation of secure authentication and authorization flows, OAuth 2.0, JWT-based authentication, access-control mechanisms, API security, secrets management, and secure service-to-service integration. Testing & Quality Engineering: Development of automated testing strategies and test suites following TDD and BDD practices, covering unit, integration, behavioural, and end-to-end testing with PHPUnit, Mocha, Karma, Cypress, and Gherkin. DevOps, Infrastructure & CI/CD: Design and implementation of automated build, test, deployment, and infrastructure workflows using Docker, Terraform, Github Actions, and Travis CI. Experience with feature-flag-driven releases, progressive delivery, controlled rollouts, rollback strategies, and LaunchDarkly, together with branching and release-management practices. Technical Leadership & Engineering Practices: Leading technical decision-making, architecture and code reviews, mentoring engineers, and establishing coding, testing, and code-review standards. Driving improvements in maintainability, testability, refactoring practices, technical-debt management, and overall engineering quality, with a pragmatic approach to SOLID principles and software design. Preparation of technical specifications, architecture documentation, API contracts, implementation plans, and developer documentation, including OpenAPI-based specifications. Additional tooling: Git, Jira, Confluence, Slack, Trello, Webpack, JavaScript, TypeScript, Vue.js, React.