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Dmytro O.
Senior PHP / Laravel Developer | Backend Engineer
Email: [open contact info](look above in the "contact info" section) Phone: [open contact info](look above in the "contact info" section) Languages: Ukrainian (native), English (fluent)

Professional Profile
Senior PHP/Java developer and backend engineer experienced in modernizing legacy systems, delivering new product features and operating
production services. Strongest focus is PHP and Laravel, with additional Java/Spring Boot experience across mortgage, FinTech, FoodTech,
aviation, HealthTech and eCommerce products. Comfortable working across several services in one product, integrating third-party systems,
handling rate limits, improving reliability and collaborating on architecture and delivery.

Core Expertise
• PHP and Laravel: PHP, Laravel 9/12, Slim, WordPress, REST APIs, MySQL, • Data and APIs: MySQL, PostgreSQL, TimescaleDB, Redis, GraphQL,
PostgreSQL and Redis OpenAPI, Prisma and WebSockets
• Modernization and architecture: Legacy refactoring and rewrites, • Cloud and delivery: AWS, Azure, Docker, GitHub Actions, GitLab CI/CD,
application and database design, service boundaries, code reviews and Jenkins, Prometheus, Grafana and Loki
production readiness
• Integrations and platform reliability: Third-party APIs, Shopify, Stripe, • Supporting technologies: TypeScript, Node.js, NestJS, Next.js, React,
AWS services, rate limiting, caching and operational troubleshooting Python, FastAPI and Playwright
• Java backend: Java, Spring Boot, Gradle, REST, microservices, Kafka and
PostgreSQL

Professional Experience
Design boutique W* | 2018-present
IA* | Tech Lead
2026-present | Aviation / Regulatory AI
• Lead architecture, security, quality and delivery for a multi-repository regulatory AI platform spanning a Python RAG engine, APIs, web/admin/mobile
clients, evaluation and AWS infrastructure.
Technology: Python, FastAPI, AWS Bedrock, OpenSearch, PostgreSQL, Redis, TypeScript, NestJS, Next.js, React, Flutter/Dart, AWS ECS/Fargate, Terraform, Docker,
GitLab CI/CD, pytest, Jest, Vitest, Playwright

MM* | Full-stack Developer
2025-2026 | FinTech / High-load market analytics
• Reworked an early client prototype into a production-grade, multi-service platform for market data, subscriptions, AI-assisted research and
customer/admin workflows.
• Built product and admin APIs, AI and bot services, and real-time WebSocket/STOMP communication with third-party data providers and web clients.
• Implemented Kafka/Protobuf ingestion and time-series storage for tens of millions of messages per day, plus Stripe subscriptions, CI/CD and
observability.
Technology: Java 25, Spring Boot 3.5, Gradle, TypeScript, Node.js, Next.js 16, React 19, PostgreSQL 18, TimescaleDB, Kafka, Protobuf, Redis, WebSockets/STOMP,
Stripe, Docker, GitHub Actions, Prometheus, Grafana, Loki, Playwright

LB* | Senior PHP / Java Developer
2024-2026 | FinTech / Mortgage platform
• Refactored and rewrote legacy code while delivering new features for a platform supporting mortgage workflows.
• Worked across several related projects and services within one product, maintaining contracts and reliability across service boundaries.
• Implemented rate-limiting controls and third-party integrations in a production environment.
Technology: PHP, Laravel 9 and 12, Java, Spring Boot, AWS, PostgreSQL, MySQL, MongoDB, Redis

Additional Project Experience
VC* | Java Developer
2025 | EdTech
• Modernized a legacy education platform, established CI/CD and delivered ongoing maintenance and updates.
Technology: Java 8, Spring, Grails, Tomcat, MySQL, Azure

TS* | Node.js Developer
2025 | eCommerce
• Implemented fine-grained authorization across hundreds of GraphQL queries, mutations and fields for a ticketing platform.
Technology: Node.js, TypeScript, NestJS, Jest, CircleCI, Prisma, PostgreSQL, Redis, GraphQL, Oso Cloud

OZ* | Node.js Developer
2024-2025 | Security
• Designed application and database architecture for an AI-assisted platform that analyzes infrastructure changes and produces threat-remediation
guidance and certification playbooks.
• Integrated OneNote and implemented infrastructure snapshot analysis and comparison.
Technology: Node.js, TypeScript, NestJS, Jest, Prisma, PostgreSQL, Redis, REST, Azure

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Dmytro O. | Tech Lead / Software Engineer

XL* | Java / Node.js Developer
2023-2025 | HealthTech
• Delivered Shopify and Stripe integrations, optimized database access, resolved overdue defects and contributed Redis work, PR reviews and refactoring
in a microservice monorepo.
Technology: Java 17, Node.js, Spring Boot, Kafka, PostgreSQL, Redis, Jenkins, REST, GraphQL Federation, Azure

HD* | Node.js Developer
2023-2024 | FinTech / Mortgage brokerage
• Designed a Strapi-based platform for mortgage brokers with Azure B2C authorization, custom administration and Stripe subscriptions.
Technology: Node.js, Strapi, PostgreSQL, GraphQL, Stripe, Azure B2C

XC* | Node.js Developer
2023-2024 | HealthTech
• Designed a collaboration platform for coaches, patients and medical centers, including GraphQL APIs, Redis caching, and Azure B2C authentication and
authorization.
Technology: Node.js, TypeScript, NestJS, Prisma, PostgreSQL, Redis, REST, GraphQL, Azure B2C

RE* | Node.js Developer
2020-2022 | FinTech / Online education
• Designed a Strapi-based platform providing subscription access to paid courses.
Technology: Node.js, Strapi, PostgreSQL, GraphQL, Stripe

GN* | PHP Developer
2019-2021 | FoodTech
• Designed a custom headless CMS integrated with Shopify and a mobile application.
• Built a high-load REST API, handled performance concerns and implemented Redis caching and Shopify/AWS integrations.
Technology: PHP, MySQL, Slim, Redis, Shopify, AWS

SM* | PHP Developer
2018-2019 | FinTech
• Customized a WordPress administration experience to simplify complex website content management.
Technology: PHP, MySQL, WordPress

Earlier Experience
Earlier roles primarily involved desktop application development using C, assembly, Visual Basic and Perl. Additional details are available upon request.

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