Konstantin

Kostiantyn Sivenkov
Backend Developer
[open contact info](look above in the "contact info" section)

●​ 10+ experience of work as PHP developer.
●​ Worked with Laravel, Symfony, MySQL, PostgreSQL, and Redis
●​ Hands-on experience with microservices, API integrations, Docker, Kubernetes, and AWS
●​ Apply OOP, MVC, SOLID, REST API, and Design Patterns principles
●​ Detail-oriented, responsible, and a good team player

Skills

Frameworks Laravel, Symfony, Vue.js, Bootstrap, Tailwind, jQuery

Programming
PHP, JavaScript, Golang
languages

Databases MySQL, PostgreSQL, Redis, MongoDB, RDS, S3

OS OSX, Linux/Debian, Windows

Front-end HTML5, CSS, Vue.js, jQuery, Ext-JS

Servers Apache, Nginx, AWS EC2

VCS Git, GitLab, GitHub, Bitbucket

Languages English - B2, Ukrainian - C1

Microservices, LAMP stack, REST API, MVC, OOP, Design patterns, Agile,
Other AJAX, Test-driven development, Database management, Docker, Kubernetes,
Swagger, Telegram Bot API, Pimcore System
 Work Experience

Project 1 Job Advertising Pimcore System

A large-scale German job advertising aggregation platform that collected,
normalized, indexed, and distributed job listings from multiple external sources
and partner feeds. The system was built on top of Pimcore, an
enterprise-grade open-source platform for Product Information Management
(PIM), Digital Asset Management (DAM), and content management, which
was extended and customized to serve as the core data and content
orchestration layer for vacancies, companies, and media assets.
Project description
The platform processed high volumes of structured and semi-structured data,
provided advanced search and filtering capabilities, and supported
multi-channel publishing and distribution of job advertisements. It served both
B2B partners and end users, requiring high availability, performance
optimization, and continuous scalability improvements. The project involved
complex data pipelines, search infrastructure, and integrations with third-party
providers and internal microservices.

●​ Designed and implemented backend architecture and core business
logic for vacancy aggregation, normalization, and publishing workflows.
●​ Extended and customized Pimcore modules to support domain-specific
entities, data models, and administrative tooling.
●​ Developed and maintained RESTful APIs and technical documentation
for internal and external integrations.
●​ Implemented multi-channel notification and mailing systems (email and
other delivery channels), including templating, scheduling, and delivery
Responsibilities tracking.
●​ Introduced and integrated a full-text search engine, designing indexing
strategies, analyzers, and relevance tuning to significantly improve
search performance and accuracy.
●​ Optimized database queries, data storage strategies, and caching
layers to handle large datasets and high traffic loads.
●​ Worked on performance profiling, bottleneck analysis, and system-wide
optimizations across services and data pipelines.
●​ Participated in infrastructure and deployment improvements, including
containerized environments and orchestration configuration.
 ●​ Collaborated closely with frontend developers, QA engineers, and
product managers to refine requirements, plan releases, and ensure
delivery quality.
●​ Conducted code reviews, enforced coding standards, and mentored
team members as a senior developer.
●​ Integrated third-party data providers and external services, ensuring
data consistency, fault tolerance, and monitoring.
●​ Contributed to architectural decisions, technical planning, and long-term
scalability strategies of the platform.

Project duration 8 months

PHP 8, Symfony, Pimcore, Ext-JS, Microservices, Kubernetes (k8s), Docker,
Used technologies
AWS

Project 2 Nutrition Management Mobile App

A mobile application designed to help users track their nutrition, calculate
calorie intake, and receive personalized dietitian recommendations. The
Project description
system includes a food database, AI-based meal suggestions, and integration
with wearable devices for real-time activity tracking

Developed and maintained the backend using Laravel and
microservices.Implemented user authentication, role-based access control,
and secure API endpoints.Integrated AI-based recommendation algorithms for
Responsibilities personalized diet plans.Optimized database queries and API response times
for a smooth user experience.Worked on cloud deployment and containerized
services using Kubernetes and Docker.Integrated AWS services for data
storage and real-time analytics.

Project duration 8 months

Used technologies PHP 8, Laravel, Microservices, Kubernetes (k8s), Docker, AWS, Vue.js
Project 3 NDA

An independent project for developing an online casino platform with a
microservices architecture. The system included a modular gaming engine,
Project description real-time analytics, and a secure payment processing system. The backend
was designed to handle high-load transactions and user activity while
maintaining performance and reliability

Designed and developed the backend using Symfony and
microservices.Implemented real-time monitoring using Grafana and
Prometheus.Worked with MySQL databases for storing user data,
Responsibilities transactions, and game history.Deployed and managed the system using
Kubernetes for scalability and fault tolerance.Integrated AWS services for data
storage, security, and serverless processing.Ensured compliance with security
standards and optimized performance for high traffic.

Project duration 1 year

Symfony, Microservices, Kubernetes (k8s), Grafana, MySQL, Prometheus,
Used technologies
AWS

Project 4 Enterprise-Level Sports Platform

A web platform for professional athletes, coaches, and sports analysts,
providing tools for monitoring, training, and statistical analysis. The system
integrates data from wearables, training devices, and external APIs to offer
Project description
real-time analytics and performance tracking. The platform supports over 30
API integrations with third-party services such as fitness apps, wearables, and
video analysis tools.

Developed and maintained a scalable backend using Laravel and
microservices.Integrated third-party APIs for data collection, including fitness
Responsibilities trackers and performance monitoring systems.Optimized database
performance using indexing, caching (Redis), and query optimization.Worked
on real-time data processing for instant athlete performance
updates.Developed custom dashboards and reporting tools for coaches and
 analysts.Deployed and managed the system using Kubernetes, Docker, and
AWS services.

Project duration 3 years

Laravel, Swagger, Docker, Microservices, Kubernetes, Vue.js, AWS, Redis,
Used technologies
MySQL, Nginx

Project 5 Teaser Ads Aggregation System

A high-load system that aggregates teaser ads from various affiliate programs.
The platform ranks these ads using proprietary algorithms, optimizing their
display based on performance metrics such as CTR, conversion rate, and
Project description
revenue. The system also includes advanced traffic segmentation, directing
targeted users to the most relevant ads to maximize engagement and
profitability.

Designed and implemented the backend architecture using a microservices
approach.Developed an ad ranking algorithm to optimize performance and
revenue generation.Integrated multiple affiliate networks and APIs for
seamless ad fetching and reporting.Implemented traffic segmentation logic to
Responsibilities
ensure relevant user targeting.Optimized MySQL queries and Redis caching
to handle high-load traffic.Deployed and maintained infrastructure using
Kubernetes (k8s) and AWS services.Ensured system scalability and fault
tolerance under high traffic loads.

Project duration 1 year

Symfony, Microservices, Vue.js, AWS, Redis, MySQL, Nginx, Swoole,
Used technologies
Kubernetes, RabbitMQ

Project 6 E-commerce Solutions Development

Project description Development and maintenance of various online stores, including B2B and
B2C solutions. The platforms included features such as advanced product
 filtering, multi-language support, payment gateway integrations, and real-time
inventory management.

Developed and maintained custom e-commerce platforms using
Laravel.Implemented advanced product search and filtering
functionalities.Integrated payment gateways such as Stripe, PayPal, and local
banking solutions.Optimized checkout processes to improve conversion
Responsibilities
rates.Worked with Akeneo PIM for product data management and
synchronization.Improved database performance using indexing, query
optimization, and Redis caching.Implemented security best practices for data
protection and payment processing.

Project duration 3 years

Used technologies Laravel, Telegram Bot API, MySQL, Docker, Redis, Akeneo PIM
 Education

Period Issued by Degree

Sep. 2023 – Dec 2024 European University - Master’s Degree in Computer Engineering
Kyiv

Sep. 2014 – May. 2018 Oles Honchar National Bachelor’s Degree in Computer Engineering
University - Dnipro