Alexey A. Buldyk

Worked closely with the feature delivery team responsible for the core software monolith, collaborating with Business Analyst and QA engineers to deliver technical improvements driven by architectural constraints, without disrupting existing business workflows.

Areas of Responsibility:

• Authorization and access control design
• Backend architecture and code quality improvement
• Refactoring and technical debt reduction
• Agent-augmented development practices

Key Contributions:

• Redesigned the authorization layer from a role-driven approach to a permission-based model leveraging Symfony Security Core. Limited roles to a foundational level, introduced fine-grained access control via custom voters, and implemented secure user impersonation.
• Integrated reusable Symfony components to standardize and strengthen the backend architecture.
• Refactored legacy modules in alignment with SOLID principles to improve maintainability and extensibility.
• Enriched the project’s dependency injection usage by leveraging Symfony DI more systematically across services.
• Connected Symfony Form to the DI container, enabling form types to operate with container-managed services comparable to the Symfony Framework behavior.
• Bridged Event Dispatcher and DI container, ensuring fully container-managed event handling.
• Leveraged Symfony’s ResetInterface (symfony/service-contracts) to manage stateful services, ensuring predictable lifecycle behavior and improved state consistency.
• Played a key role in the development and launch of a new analytical module that replaced a legacy internal implementation restricted by limited extensibility and reuse.
• Developed custom Psalm extensions to support container cache file specifics and handle non-obvious method invocations.

Achievements:

• Reduced architectural complexity and strengthened long-term maintainability.
• Increased flexibility and scalability of the permission system.
• Established a more granular and secure authorization model.
• Improved service lifecycle management and reduced side effects in stateful components.
• Elevated overall architectural maturity through deeper adoption of Symfony core components.
• Removed unmaintained dependencies to unblock version upgrades of the remaining ecosystem and ensure long-term maintainability.
• Improved static analysis coverage by adapting Psalm to project-specific architectural patterns.

Technologies used:

• Symfony
• composer
• DI
• SOLID
• PHPUnit
• PHP CS Fixer
• Psalm
• junie
• codex

Independently developed new business-driven services built on Symfony.

Areas of Responsibility:

• Developing a RESTful API built with Symfony and API Platform using an alternative ORM approach.
• Stabilizing internal BI service for extracting business events and metrics from service logs.

Key Contributions:

• Fast prototyping and development of a RESTful API service based on Symfony and API Platform
• Designing and maintaining an alternative ORM integration (Cycle ORM instead of Doctrine).
• Organizing event collection from multi-vendor Kubernetes clusters and bare-metal environments.
• Forwarding Google Cloud Pub/Sub subscription events and implementing Vector as an agent to collect and forward logs from nodes outside the GKE ecosystem.
• AI assisted prototyping a Rust microservice to enrich event pipelines with infrastructure metadata.
• Implementing fallback behaviour to collect docker logs for local development purposes.
• Integrating Grafana for metrics visualization and incident alerting.
• Configuring database retention policies for efficient long-term metric storage.

Achievements:

• Built and productionized a fault-tolerant BI platform
• Implemented proactive incident notifications based on non-obvious business metric anomalies
• Increased efficiency and resilience of the distributed metrics processing pipeline.
• Enhanced operational visibility across distributed infrastructure

Technologies used:

• Symfony
• API Platform
• Cycle ORM
• Kubernetes
• GKE
• OVH
• Docker
• Grafana
• TimescaleDB
• Vector
• RabbitMQ
• Rust
• Prompting

Worked in a dedicated team for a single enterprise client.

Areas of Responsibility:

• Maintained a high‑load legacy monolith that processed live data streams 24/7.
• Supported designers and frontend devs by adding backend hooks for a continuous UI redesign.
• Balanced workload across worker processes and message queues to keep throughput stable.
• Delivered both business features and infrastructure tasks.
• Automated server setup and deployments with Ansible.
• Containerised services with Docker for easier rollout.
• Stored and queried big data in ClickHouse.
• Wrote unit tests to safeguard quality as traffic kept growing.

Key Contributions:

• Migrated key-value storage and cached data from Memcached to Redis with zero downtime using a dual-write approach.
• Separated parts of the monolith into independent services to reduce coupling and improve system modularity.
• Refactored critical modules to boost performance, readability, and test coverage.
• Built new Symfony‑based microservices to replace and extend monolithic functionality.

Technologies used:

• RabbitMQ
• Ansible
• Memcache
• Redis
• Docker
• ClickHouse
• MySQL
• PostgreSQL
• Jenkins
• Bitbucket
• PHPUnit

Worked in an international, distributed team for a major client.

Areas of Responsibility:

• Supported a sharded architecture split by market; processed gigabytes of data in batch jobs.
• Followed Scrum methodology and helped each sprint finish on time.
• Communicated daily and weekly with the PO, PM, QA, Dev, DevOps, Delivery, Scrum Master, and BI teams.

Achievements:

• Led the phased upgrade of a large legacy codebase. Updated vendor libraries, refactored key modules, and optimized performance.
• Introduced Composer to stop storing vendor libraries in the repo and simplify dependency management.
• Built a high‑load service that mass‑publishes ads and integrates with third‑party APIs.
• Tuned database queries and indexes to avoid locks and keep performance high.

Technologies used:

• Symfony3
• GitHub
• Google AdWords API
• Bing Ads API
• REST
• SOAP
• Scrum
• PHP
• MySQL

Started as a full-stack developer on internal Drupal-based projects, later focused on backend development with Symfony2 for large international clients.

Areas of Responsibility:

• Worked on developing and maintaining web services for mobile and web applications.
• Communicated directly with English-speaking clients to clarify requirements and ensure alignment.
• Participated in enterprise-level development workflows, including task tracking in Jira and job execution via Jenkins.
• Gained valuable experience working in a large, structured engineering environment.

Technologies used:

• Git
• Symfony2
• SOAP
• REST
• PHP
• MySQL
• PostgreSQL
• JIRA
• Jenkins
• Mercurial

Areas of Responsibility:

• Extended and maintained a proprietary PHP/PostgreSQL-based web framework used across multiple client projects.
• Built websites of varying complexity for studio clients using the in-house framework.
• Gained first experience in collaborative, team-based development.
• Worked extensively with PostgreSQL. Developed stored procedures, used triggers, and applied denormalization techniques to improve query performance.
• Contributed to business logic both in application code and directly within the database layer.

Achievements:

• Gained first hands-on experience collaborating within a team using version control systems.
• Led projects independently, assuming full project management responsibilities.

Technologies used:

• SVN
• PostgreSQL
• PHP
• HTML
• CSS

Areas of Responsibility:

• Developed a high-load PHP-based mass mailing service using PHP cURL.
• Optimized system resource utilization and memory management to support parallel processing and large-scale email delivery.

Achievements:

• Implemented load balancing using pseudo-queues based on database tables.
• Integrated payment gateways into e-commerce platforms.
• Conducted security assessments and testing on application-level protocols (HTTP, FTP, SFTP) to detect and mitigate vulnerabilities.
• Expanded technology stack by learning and working with the Drupal CMS.

Technologies used:

• Kohana
• PHP
• MySQL
• Bash
• Webmoney Merchant API
• HTTP
• FTP
• Curl
• Drupal