Dykyi Roman - Senior Software Engineer

Profile

Senior Software Engineer with 16+ years of experience designing and building scalable backend systems. I specialize in DDD, CQRS, Event-Driven Architecture, Event Sourcing, and Microservices, applying Clean, Layered, and Hexagonal architecture patterns to solve complex business problems.

Experienced in Team Lead and Tech Lead roles — driving architectural decisions, mentoring engineers, and delivering high-quality solutions. Passionate about clean code, continuous improvement, and knowledge sharing through articles, teaching, and open-source contributions.

Skills

Programming: PHP, JavaScript, Go, Delphi
Frameworks: Symfony, Laravel, Yii2, CodeIgniter (framework-agnostic mindset)
Data & Messaging: MySQL, PostgreSQL, MongoDB, Redis, Elasticsearch, RabbitMQ, Kafka
Architecture: Clean, Layered, Hexagonal, CQRS, EDA, Event Sourcing, Modular, Microservices
Principles: DDD, ADR, GRASP, SOLID, KISS, DRY, YAGNI, 12-Factor
Design & Docs: C4 diagrams, PlantUML, API specifications (OpenAPI), technical documentation
Quality: PHPUnit, Codeception, Postman, Deptrac, PhpCsFixer, Psalm, PHPStan, PHPDoc
DevOps: Docker, GitLab CI, GitHub Actions
AI: Claude Code, AI agents development, prompt engineering
Leadership: Mentoring, onboarding, team building, SCRUM, SAFe, MoSCoW, GitFlow

Professional Experience

Forex4you

Latvia / Remote

Tech/Team Lead Feb 2023 – May 2025

Senior PHP Developer Apr 2020 – Feb 2023

Designed a service-oriented architecture for billing workflows, ensuring flexibility and maintainability; integrated Zoho CRM, Risk Assessment Matrix, and notification services.
Integrated open banking (Yapily), payment CRMs (Konnektive, Sticky), and payment gateways: BitPay, Fibonatix, MaxPay, ACI PayOn, EmerchantPay, Checkout, Paytend, Trust Payments, and others.
Developed a custom billing solution with microservices for better scalability and modularity, replacing paid payment gateways.
Transitioned a marketplace project from outsourcing to in-house development: formed a dedicated team, created a technical roadmap, and implemented step-by-step refactoring to enhance stability and performance.

Lucky Labs

Riga, Latvia

Senior PHP Developer Jun 2019 – May 2020

Promoted the Domain-Driven Design (DDD) approach within the team to improve project focus and alignment with business goals.
Boosted the speed of functional testing by 3x; implemented new gamification features to increase user engagement.
Integrated a new game provider; compressed data to address SEO performance issues; set up a CI/CD pipeline to automate deployment.

UvoCorp

Kyiv, Ukraine

Team Lead Jan 2017 – May 2019

Integrated Customer.io, Twilio Lookup, HashiCorp Vault, and Document Plagiarism APIs to enhance functionality and security.
Separated the Core bundle into functional modules following the DDD approach; created a Docker environment for streamlined local development.
Migrated error tracking from Errbit to Sentry; integrated Graylog for centralized log management and enhanced troubleshooting.

Travel Professional Group (TPG)

Kyiv, Ukraine

Senior PHP Developer / Team Lead Jun 2014 – Dec 2016

Developed a Skype API messenger integration using PHP and Delphi.
Built an Admin CRM from scratch using Laravel and PHP 7; led full-stack website development projects using WordPress, Laravel, PHP, and JavaScript.

4Shared / 4Sync

Kyiv, Ukraine

Senior Delphi Developer Nov 2012 – Oct 2014

Delphi Developer Jun 2011 – Nov 2012

Developed a coupons module and toolbars for multiple platforms: 4shared Toolbar, 2shared Toolbar, and 4Sync Toolbar.
Created a centralized logging server for all systems using the Syslog protocol (UDP/IP).
Wrote FastReport scripts for automated report generation; developed DLLs for LoadRunner load-testing scenarios; built online and offline installers with NSIS.
Developed various COM objects to support integration and automation tasks.

Selected Achievements

Unified admin panel for microservices architecture: developed a manifest and inter-service communication methods, creating a flexible admin panel that requires no constant adjustments as the system architecture evolves. Also built a custom billing CRM (CardStore, PaymentIntegration, Notification, RiskAssessment) to move away from paid payment gateways and save the business money.
Moved a legacy project from outsourcing to in-house development: formed the team, developed a technical roadmap, and implemented a step-by-step refactoring process — transforming a complex, confusing project into a stable and efficient product without interrupting business operations.
Independent technical audits: professional audits of code quality, architecture, security, performance, and development workflows; built a reputation as a trusted technical consultant through word-of-mouth recommendations.

Teaching & Publications

PHP Teacher — IT School Hillel (Jan 2017 – Dec 2019); public course presentations available on GitHub.
Featured in: PHP Annotated by JetBrains (Sep 2023); PHP Digest (Sep 2025, Aug 2025, #202 Apr 2021).
Writing: medium.com/@dykyi.roman (architecture & engineering) · habr.com/ru/users/dykyi_roman (PHP & DDD).

Education

Bohdan Khmelnytsky National University of Cherkasy

2006 – 2011

Master’s degree — Computer, Information and Biomedical Technology