Віктор

VIKTOR YASINEFTA
Senior/Staff Full-Stack & Backend Engineer

PHP · Laravel / Yii 2 / Symfony · React / React Native · HighLoad & OLAP
(ClickHouse) · DDD / EDA / SOA · API & Platform Architecture · Legacy
Modernization · AI-Augmented Development · Autonomy · 14 yrs

LinkedIn
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GitHub
https://github.com/victorian-august

E-mail
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Professional Summary
Senior/Staff Full-Stack & Backend Engineer with 14+ years of experience specializing in
high-load backend systems, analytical platforms, complex cloud infrastructure solutions,
and reviving long-inactive legacy systems. Expert in the PHP ecosystem and frameworks
(Laravel up to 13.x, Yii 2), and robust data storages (PostgreSQL, ClickHouse, MySQL),
with a proven track record of comprehensive full-stack modernization by simultaneously
upgrading monolithic PHP backends and React Native mobile clients (up to 0.72.15 with
React 18) under modern build environments. Focused on transforming monolithic legacy
systems into clean, modular structures using DDD, SOA and EDA architectures. Thrives in
autonomous, outcome-driven teams where engineering and product think together.

Engineering Excellence & Paradigms

● Software Design: Deep understanding of OOP principles and SOLID design
patterns to build maintainable and scalable systems.
● Development Philosophy: Strict adherence to KISS, DRY, and YAGNI to minimize
technical debt and ensure code clarity.
● Design Patterns: Practical application of GoF patterns (Factory, Adapter, Proxy,
and Strategy pattern for dynamic data scraping and parsing engines) within
complex business logic.
● Refactoring: Transforming monolithic legacy systems into clean, modular
architectures, legacy software revival and major platform migration.
● AI-Driven Engineering: Pragmatically orchestrates autonomous AI coding agents
(OpenHands, Cursor, Claude Code) to automate routine boilerplate, accelerate
prototyping and execute multi-stage infrastructure migrations, while acting as
technical supervisor to define precise architectural constraints, review generated
diffs, enforce code quality and security standards before merge.
● AI-Augmented Productivity: Utilizes Gemini Notebook to synthesize large-scale
project documentation and navigate complex legacy codebases, ensuring faster
onboarding and accurate requirement discovery.

Programming & Languages

● PHP: Expert level (14+ years). Proficient in versions 5.3 through 8.4 (adopting
readonly properties, constructor property promotion, enums, and attributes).
● JavaScript & TypeScript: Full-stack development, mobile component architecture,
and strongly-typed API client generation.
● SQL: Complex query design, optimization, data migrations, window functions.
● HTML5 / CSS3 / Sass: Cross-browser responsive layouts, BEM methodology.
● Low-level & Systems background: C/C++, Assembler, Delphi/Pascal.

PHP Frameworks & Ecosystem

● Frameworks: Laravel 13.x and libraries (Laravel Scout, Spatie MediaLibrary,
L5-Swagger), Symfony (components), Yii 2, Zend Framework (2/3), CodeIgniter.
● CMS: WordPress / WooCommerce (headless & custom solutions), OpenCart,
OctoberCMS (Laravel-based).

Frontend Frameworks & Libraries

● Modern: React Native 0.72.15, React 18.2.0, Angular (2+), TypeScript.
● Mobile Libraries: Redux, react-native-reanimated (C++17 standard),
GestureHandlerRootView.
● Legacy/Utility: jQuery, Backbone.js, Bootstrap, Twig.

Databases & Storage

● Relational: PostgreSQL (PostGIS, JSONB, composite types), MySQL 8.0, MariaDB.
● NoSQL & Cache: Redis (asynchronous event queueing, multi-layer caching),
Memcached (ExpressionDependency).
● Analytical / Big Data: ClickHouse (OLAP analytics for ad traffic).
● Search Engine: Elasticsearch (high-speed product discovery and similar items
suggestions).

Architecture & System Design

● Patterns: Domain-Driven Design (DDD), Event-Driven Architecture (EDA),
Service-Oriented Architecture (SOA).
● API Design: Professional RESTful API design from scratch, Swagger/OpenAPI,
Contract-First API development with TypeScript generator integration.
● System Health: High-load optimization, Database normalization, Legacy system
refactoring.
● System Integrity: "Soft Interception" registration flow (reconciling pre-created
contacts with OTP verification to prevent unique field conflicts).
● Custom Solutions: EAV (Entity-Attribute-Value), MirrorTrait for database
synchronization.

DevOps & Infrastructure

● Containerization: Docker, Docker Compose (orchestrating multi-container
systems with dedicated queue-worker).
● Cloud & Virtualization: OpenStack (API automation), Vagrant.
● CI/CD: GitLab CI/CD, TeamCity, Git (Git Flow, Bitbucket, GitHub).
● Monitoring: Zabbix (nvidia-smi integration for GPU farms).
● Server Management: Linux (Ubuntu), Nginx, Apache, SSH, Bash scripting.
● iOS Build Pipeline: Xcode 16, CocoaPods, patch-management for legacy native
code (RCT-Folly C++ redefinition patches, Swift Concurrency linking
configuration).
● Android Build Pipeline: Gradle 8.1.1, AGP 8.1.1, Java 17, Target SDK 34.

Engineering Culture & Quality

● Practices: Code review (Senior/Lead level), Mentoring, Technical debt
management and liquidation (rebuilding Swagger documentation on PHP 8
Attributes, standardizing API responses via strict JSON Resources.
● Standards: SOLID, DRY, KISS, YAGNI.

Testing (QA)

● Backend Testing: PHPUnit.
● E2E Testing: Detox (E2E automation, writing comprehensive user behavior
scenarios, testID instrumentation).
● Static Analysis: ESLint, PHPStan / Psalm.

Methodologies & Management

● Workflow: Agile, Scrum (sprints, retrospectives, planning), Kanban, autonomous
technical scoping & legacy risk assessment.
● Management Tools: Jira, Redmine, Trello.

Domains

● AdTech/MarTech: Designing REST APIs for video ad monetization (VAST/VPAID),
developing offer parsers, and integrating remarketing/tracking scripts.
● E-commerce & Retail: End-to-end shop development (OpenCart, WooCommerce),
accounting system integrations, complex product filtering, payment gateway
implementation (LiqPay), and PageSpeed optimization.
● Logistics / WMS: Architecting Warehouse Management System (WMS) and
fulfillment platform using Domain-Driven Design (DDD) for complex business logic.
● Web Analytics & Data: Building automated site audit reporting tools (SiteExpertise)
and processing Big Data at AGA Medialab.
● Network Security / VPN: Developing backend services (VPNManager) for account
management and connection handling with data replication support.
● Cloud Services / IaaS: Automating server lifecycles and managing resource quotas
(flavors) via OpenStack APIs.
● Travel & Booking: Integrating third-party travel APIs (Aer Lingus, Sceptre
Vacations) and building comprehensive administrative panels.
● Social E-Commerce & Gifting Platforms: Synchronization of physical phone
contacts, custom wishlist architectures, automated web parsing/scraping, and
real-time push notification delivery.

Professional Experience

Full-Stack Modernization Engineer | Social E-commerce & Gifting
Platform

Jun 2026 – Aug 2026 · 3 mos · Kyiv, Ukraine · Remote

About the Project:
An application is a mobile-first social e-commerce and gifting platform (iOS/Android) that
allows users to synchronize phone contacts, create wishlists, and reserve/parse products
directly from major global retail sites.

Achievements:
● Spearheaded Legacy Full-Stack Revival: Resurrected a "frozen" 5-year-old
codebase via a risk-minimized, staged migration strategy: advancing the backend
sequentially through 6 major Laravel versions (6.18 → 13.x, PHP 7.4 → 8.4, MySQL
8.0) while progressing the mobile app through 3 major React Native milestones
(0.62 → 0.68.7 → 0.72.15, React 18.2.0) on Node.js 22 (LTS), synchronizing API
contract changes with mobile releases at each stage to prevent breaking changes.
● Resolved Xcode 16 & Android target SDK 34 Blockers: Overcame severe
compilation issues in modern build toolchains. Patched RCT-Folly for C++ conflicts
in Apple SDKs, forced C++ 17 standard compiler configurations for
react-native-reanimated, configured Swift Concurrency runtime linking
(_swift_coroFrameAlloc), resolved Kotlin bytecode version conflicts in the Android
D8/R8 dex compilation stage via targeted dependency pinning, locked the Firebase
BOM to preserve legacy push-notification compatibility, and upgraded the Android
pipeline to Gradle 8.1.1, AGP 8.1.1, and Java 17.
● Engineered a Resilient Product Parsing Engine: Developed an intelligent product
parser using the Strategy Pattern (JsonLd, Microdata, OpenGraph). Implemented
an Intelligent Fallback mechanism to gracefully handle third-party site availability
issues (HTTP 403 responses) via automatic degradation to URL-based
meta-extraction, with configurable retry/backoff logic to maintain service reliability.
● Audited Legacy Registration Architecture: Diagnosed a critical conflict in the
pre-existing "shadow profile" registration flow (contact-sync placeholders
blocking legitimate user sign-up) and defined an OTP-verification-based resolution
path, while preserving system stability during the framework migration.
● Established Mobile E2E Testing: Built a robust end-to-end testing infrastructure
using Detox, authoring 30+ comprehensive behavioral scenarios covering the
complete core journey (User Registration -> Sync -> Create Wishlist -> Parse &
Reserve Product).

● Optimized Network Layer & UI Stability: Resolved critical API Request Loops and
memory leaks by implementing strategic useMemo hooks in Api.hooks.ts.
Eliminated Safe Area overlaps and notch-related rendering issues across various
iPhone and Android device profiles. Integrated FCM (Firebase Cloud Messaging)
for Silent Push Notifications to trigger instant background UI updates once
server-side workers finish scraping.
● Detected Cross-Account Data Leak: Diagnosed a critical client-side session
isolation defect causing cross-account data leakage on account switch,
root-caused to stale JWT token persistence in Redux-persist/AsyncStorage.

Key Responsibilities:
● Owned the entire full-stack technical scoping, Docker-compose infrastructure
orchestration, and technical debt liquidation.
● Automated staging demo data generation by writing advanced database seeders
and integrating Spatie MediaLibrary for automated media processing.
● Standardized backend-frontend communication contract using OpenAPI Generator
(TypeScript) with strict JSON Resources, enforcing explicit "operationId"
annotations across API controllers to guarantee stable, human-readable generated
client methods across framework upgrades, and including automated
HTTP/HTTPS protocol switching and local URL normalization for consistent
cross-emulator development.

Skills: Full-Stack Autonomy, Legacy Modernization, Systems Integration,
Automated E2E Testing, Cloud Infrastructure.

Tech Stack: PHP 7.4 (up to 8.4), Laravel 6.18 (up to 13.x), MySQL 5.7 (up to 8.0),
Docker Compose, Redis 5 Alpine, Elasticsearch 7.17, React Native 0.62 (up to 0.72.15),
React 16.11 (up to 18.2.0), Redux, Detox, Node.js 16 (up to 22), TypeScript, OpenAPI Generator,
Java 8 (up to 17), Gradle 8.1.1, Spatie MediaLibrary, Firebase Cloud Messaging (FCM),
Bugsnag, AI Tools (Gemini Notebook, Claude), IDE Android Studio, Xcode 16, macOS.

Full-Stack Engineer / Technical Consultant (Contractor) | Mobilunity

Apr 2023 – Jun 2026 · 3 yrs 3 mos · Kyiv, Ukraine · Remote

About the Company:
Mobilunity is a global provider of dedicated development teams. The company believes
that the key to any successful endeavor lies in the people that commit themselves to it.
Therefore the company leverages the relationships that we have locally, to unite
companies from around the world, with the very best IT talents. All done by investing in
people, ensuring employee retention, effective teamwork, and advanced performance.

Achievements:
● Significantly improved the performance, maintainability, and load times of web
components for the company's core marketing platforms.
● Optimized engineering operations by authoring a standardized "macOS Local
Environment Guide," slashing developer onboarding/setup time from 1 day to 1 hour
through automated Homebrew-based configurations.
● Resolved complex infrastructure blockers during a major platform migration,
including debugging Docker container builds and fine-tuning Nginx reverse proxy
configurations to handle local virtual hosts and specialized media asset
permissions.
● Led technical decomposition and estimation for high-priority frontend features,
including the "Our Clients Page", identifying architectural requirements for dynamic
filtering functionality and data-driven section banners.
● Facilitated cross-functional technical reviews by identifying edge cases in design
templates (e.g., responsive logo cropping and interactive banner behaviors),
reducing potential UI regressions before the development phase.

Key Responsibilities:
● Developed and optimized scalable web features across PHP and WordPress-based
distributed systems.
● Integrated modern development workflows and AI-driven tools (e.g., Cursor,
Claude) to accelerate feature delivery and maintain high code quality standards.
● Provided accurate task estimations and drove technical documentation initiatives
within an Agile team environment.

Skills: Autonomy, Teamwork, Agile Methodologies, Technical Documentation, Task Estimation.

Tech Stack: PHP, WordPress, JavaScript, TypeScript, Docker, Git, GitLab, Redmine, macOS.

Full-Stack Engineer | Retriever Media Informatie (via 3asoft)

Apr 2023 – May 2023 · 2 mos · Netherlands / Belgium · Remote

About the Company:
Retriever is the media database for professionals: complete & up-to-date. To create a
successful media campaign you need knowledge of current opportunities and possible
reach. Retriever collects data from all Dutch, Belgium and Luxembourg media and
converts this into valuable information and solutions. This enables media professionals to
carry out the right analyses and use these to compose the best media strategies.

3asoft is a software development company which provides high-quality services for
start-ups, digital agencies and small to medium-sized businesses.

Achievements:
● Eliminated the need for synchronized frontend-backend deployments for UI
changes by migrating legacy PostgreSQL composite types to dynamic
JSON-based configurations via json_build_object(), allowing the React
register_renderer() to deliver components directly from DB-metadata.
● Eliminated cross-environment authentication failures and redirect loops in the
development environment by implementing unified routing logic and pw_hash for
administrative accounts, ensuring consistent session behavior between local and
dev environments.
● Stabilized analytical workloads by profiling and recalibrating memory allocation for
retriever_be_gis (PostgreSQL/PostGIS) databases, preventing OOM-crashes during
intensive GIS data processing.
● Successfully accelerated the delivery of a modern media resource management
admin panel utilizing React and TypeScript.
● Executed critical database migration initiatives, modernizing legacy data structures
and ensuring complete data integrity.

Key Responsibilities:
● Built scalable React + TypeScript frontend components for data-heavy
administrative interfaces.
● Collaborated closely with product managers and cross-functional teams to
modernize core architectures within a Scrum framework.

Skills: Teamwork, Agile Methodologies, Scrum, CI/CD.

Tech Stack: Docker, JavaScript, TypeScript, React, PostgreSQL, PostGIS, Git, GitHub, macOS.

Full-Stack Engineer | Similarweb

Dec 2022 – Dec 2023 · 1 yr · Tel Aviv, Israel (Remote) / Kyiv, Ukraine (Hybrid)

About the Company:
The company powers businesses with the best digital data. The mission is to create the
most accurate, comprehensive, and actionable digital data, so every business can win
their market.
Similarweb is a platform that gives customers a true 360 degree view of all digital activity
across customers, prospects, partners, and competition.

Achievements:
● Engineered scalable internal tools and developed robust features for the corporate
platforms using Symfony migrations and ~30-40 ACF components, accelerated
content delivery for marketing teams by 50% and supported a global platform
scaling to ~6.5M monthly visits.
● Developed autonomous internal database reporting tools that streamlined data
extraction and analysis, resulting in accelerated workflows for product and
marketing teams.
● Optimized system reliability during major releases (e.g. Buyer Journey) by
refactoring environment helper classes and implementing automated content
migrations to ensure 100% data integrity across environments.
● Enhanced cross-functional delivery efficiency by integrating GitLab Merge Request
tracking with Jira and proposing architectural shifts to move logic from templates
into components, facilitating faster feature delivery.

Key Responsibilities:
● Engineered scalable web components from scratch for the Similarweb corporate
websites and marketing blog (Similarweb Corp, Similarweb Blog, Digital 100),
ensuring high availability for global traffic.
● Spearheaded the refactoring of critical legacy nodes within the corporate platform,
utilizing Symfony components to decouple business logic from the WordPress
core, which significantly enhanced system stability and long-term maintainability.
● Facilitated architecture discussions, and provided Senior-level code reviews to
mentor peers and championed new team-wide coding agreements (strict typing,
PSR standards, and design patterns), directly improved codebase quality and
reduced technical debt.

Skills: Teamwork, Design Patterns, Agile Methodologies, Scrum, Mentoring, CI/CD.

Tech Stack: PHP, Symfony, WordPress (headless), Advanced Custom Fields (ACF), MySQL,
JavaScript, CSS, HTML, GitLab, Docker, JIRA, macOS.

Full-Stack Developer | DH Enterprise (via KSF Technologies)

Feb 2019 – Aug 2021 · 2 yrs 7 mos · New York, US (Remote) / Kyiv, Ukraine (Hybrid)

About the Company:
DH Enterprise and Associates, Inc. has been in business under various different names
since 1980. Today this is a parent company of Great Value Vacations, an online leader of
expertly designed vacations at an affordable price, and GCS, our industry-facing product
sourcing division. With GCS, DH offers turn-key solutions in the areas of travel
technology, management, and operations. All brands, including Sceptre Vacations, and
the Aer Lingus Vacation Store, offer premium air-inclusive packaged vacations worldwide.

KSF Technologies is a software development company providing services worldwide
since 1992.

Achievements:
● Engineered seamless and reliable integrations with major third-party travel APIs
(including Hertz car rental service, Aer Lingus, Sceptre Vacations), expanding the
platform's booking inventory by 30% and seamlessly handling traffic of over 300K
monthly visits.
● Systematically mitigated technical debt and improved delivery predictability by the
refactoring of a monolithic legacy codebase into a modular Laravel architecture
using Service-Oriented Architecture (SOA) and Event-Driven Architecture (EDA)
principles.

Key Responsibilities:
● Developed complex admin dashboards, UI components, and secure REST API
integrations utilizing the Laravel framework.
● Enhanced overall system stability by implementing comprehensive unit test
coverage with PHPUnit.
● Prepared and delivered iterative product demos for owners and marketing teams,
ensuring 100% alignment between technical delivery and business objectives.
● Optimized full-stack operational efficiency within an Agile/Scrum environment by
coordinating closely with a 5-member QA team to identify and resolve critical
architectural bottlenecks, resulting in a more resilient and predictable deployment
pipeline.
● Facilitated cross-functional technical communication with stakeholders across QA,
marketing, and third-party service providers.

Skills: Teamwork, Design Patterns, Unit Testing, Agile Methodologies, Scrum, CI/CD.

Tech Stack: PHP, Laravel, PHPUnit, MySQL, Elasticsearch, JavaScript, React, TypeScript,
CSS, HTML, Git, Vagrant, JIRA, Linux (Ubuntu).

PHP Developer | ARVI Lab

Dec 2016 – Feb 2019 · 2 yrs 2 mos · Kyiv, Ukraine

About the Company:
The company is a global leader in the LBE VR market, offering the largest in-house AAA
content library. The company helps businesses grow and operate effectively through
extensive marketing resources, research-backed insights to attract and retain more
customers, and a marketplace with high-quality third-party content.

Achievements:
● Developed and launched the official corporate website, expanding the company's
global LBE VR market presence.
● Achieved high-performance product ranking and competitive analytics by
developing a scalable data grabber Steam Parser (PHP/Laravel) that processed
massive JSON datasets from the Steam store and optimizing database architecture
to handle high transaction volumes. This resulted in analytical reports generating
dozens of times faster and provided the business with real-time insights into game
positions and market trends.
● Conducted a comprehensive optimization of images and resources, which
increased Google PageSpeed Insights scores, i.e. blog page from 17/73
(mobile/desktop) to 24/93.
● Automated the lifecycle of virtual servers via OpenStack API, configured quotas
(flavors), and implemented Bash pre-initialization scripts (user_data) for automated
Ubuntu deployment with CUDA/Tensorflow support.
● Built a proactive monitoring system for GPU farms via Zabbix API. Integrated
nvidia-smi to monitor video card load; created console commands to automatically
identify idle capacity.
● Engineered a custom "Mirror trait" for real-time data synchronization between
PostgreSQL and MySQL, ensuring high availability and 100% data consistency
across a distributed VPN management infrastructure.
● Eliminated critical race conditions and prevented resource over-utilization by
implementing strict session concurrency controls (limited to 5 active connections
per account), stabilizing the platform under high-load request volumes.
● Achieved stable and automated operation of a distributed worker network by
developing a core REST API (based on Laravel and October CMS) for dynamic
OpenVPN configuration lifecycle management (HideMyAss, IPVanish) and
implementing a Quality of Service (QoS) monitoring system, resulting in successful
pool scaling to 95 simultaneous secure connections (across 47 machines),
automatic isolation of non-functional tunnels, and the complete elimination of
routine account administration.

Key Responsibilities:
● Developed the backend and API for more than four different business areas:
AdTech (Video Ads CRM), AI PhotoPolls (ReTouch), VPN/Network Monitoring, and
Cloud Software.
● Developed an internal corporate portal for managing employee data and secure
storage of scanned copies of documents using Laravel-based OctoberCMS
framework.

Skills: Autonomy, Design Patterns, Database Design, HighLoad, RESTful Architecture,
Teamwork

Tech Stack: PHP, Laravel, OctoberCMS (Laravel-based lightweight framework), MySQL,
Swagger, JavaScript, CSS, HTML, Git, OpenStack, Zabbix, Swagger, JIRA, Linux (Ubuntu).

Software Engineer | AGA Medialab (via ARVI Lab)

Dec 2016 – Dec 2018 · 2 yrs · New York, US · Remote

About the Company:
AGA Medialab is an experienced marketing agency with relentless focus on improving
user experience and monetization across emerging media consumption channels. We
work primarily with Virtual Reality (VR), Augmented Reality (AR), Mixed Reality (MR),
Over-The-Top (OTT) content owners and Internet Protocol Television (IPTV) providers to
help bring their product to market and identify additional advertising monetization
streams. As a part development, part creative, and part marketing group we are intimately
familiar with every step of a successful launch and monetization in AR, VR, MR, and OTT
channels.

Achievements:
● Architected and launched a VAST/VPAID-compliant AdTech CRM from scratch to
production.
● Implemented multi-layer API caching (Memcached/Redis) verified by Apache
Benchmark, confirmed 2x throughput increase on high-traffic endpoints.
● Optimized high-load analytical data processing by implementing and querying
ClickHouse (OLAP), enabling rapid handling of massive ad traffic volumes.
● Slashed complex report generation time by 10x and ensured the API sustained
peak ad network loads with zero downtime.
● Exceeded data accumulation ~250 millions records per week on average and 11TB
totally.

Key Responsibilities:
● Designed robust REST APIs utilizing Yii 2 and Swagger.
● Managed complex PostgreSQL/MySQL-based storage systems and engineered
advanced data manipulation workflows.

Skills: Design Patterns, Database Design, HighLoad, RESTful Architecture, Teamwork.

Tech Stack: PHP, Yii 2, PostgreSQL, ClickHouse, Swagger, JavaScript, Angular, React, CSS,
HTML, Git, JIRA, Linux (Ubuntu).

PHP Developer | IQ Creative Group

Jun 2015 – Jun 2016 · 1 yr · Varna, Bulgaria · Hybrid

About the Company:
IQ Creative Group is an advertising agency, which is working on the internet market. The
company is creating solutions to promote brands and sell products, using most modern
technologies. The agency has two divisions in Europe. The main market is in Bulgaria.

Achievements:
● Designed, engineered, and successfully launched the beta version of a highly
complex Warehouse Management System (WMS), flawlessly processing over 100K
delivery requests for an active B2B user base of 800+ clients.
● Applied strict Domain-Driven Design (DDD) principles to accurately model,
architect, and streamline fulfillment logistics operations.
● Reduced Time-to-Market (TTM) for onboarding new clients by implementing an…