Oleksandr

Oleksandr Lehotskyy
Senior Software Engineer
Lviv, Ukraine
[open contact info](look above in the "contact info" section)
[open contact info](look above in the "contact info" section)
LinkedIn: [open contact info](look above in the "contact info" section)

EXECUTIVE SUMMARY

Senior Software Engineer with 10+ years of commercial experience building
high-performance APIs and scalable backend systems (PHP, Laravel, Symfony).

● Architecture & Performance: Designed event-driven architectures
(RabbitMQ, Kafka, MQTT) and optimized MySQL databases. Delivered
solutions handling up to 100k RPM with a 50% response time reduction.
● Leadership: Mentored engineers, conducted code reviews, and drove
architectural decisions in distributed Agile teams.
● Domain & Infrastructure: Experienced in e-commerce, SaaS, IoT, and
real-time communication. Skilled in AWS, Docker, test automation, and
modern CI/CD practices.

SKILLS
● Languages: PHP, Python, JavaScript, HTML/CSS
● Frameworks & Libraries: Laravel, Symfony, Slim, Yii, ReactJS, VueJS
● Architecture & Methodologies: Event-Driven Architecture (EDA), System
Architecture, OOP, TDD, REST APIs Design
● Databases & Search Engines: PostgreSQL, MySQL, SQLite, Redis,
Meilisearch, Algolia
● Message Brokers & Streaming: Apache Kafka, MQTT
● Cloud & DevOps: Amazon AWS (S3, SNS), Docker, CI/CD (GitLab CI/CD, GitHub
Actions)
● Testing & Tools: API Testing, OpenAPI / Swagger Documentation
● Version Control & OS: Git (GitHub, GitLab, BitBucket), Linux, MacOS
● AI & Automation: AI agents, LLM Integration

EXPERIENCE

Web application "Cashier's Workplace" (Point of Sale System)
Lead Software Engineer | Dec, 2025 – Aug, 2026.
Responsibilities:
 ● Leading the development of a robust point-of-sale system, authoring
technical documentation, and conducting precise task estimations.
● Engineered the core business logic for a high-load sales platform,
ensuring fault tolerance and high availability for up to 5,000 concurrent
users and continuous transaction processing.
● Designing a scalable microservices architecture utilizing Apache Kafka to
accommodate future ecosystem expansions, including a product catalog,
equipment repair service, and a mobile app API with a loyalty program.
● Architecting a seller's personal cabinet for tracking individual
statistics and managing vacation schedules.
● Optimizing application performance and asynchronous task processing using
Laravel Octane and Horizon, with the infrastructure deployed on
DigitalOcean.
● Implementing real-time features and WebSocket communication utilizing
Laravel Reverb and React.
Tech Stack: Laravel, React, Laravel Octane, Laravel Horizon, Laravel Reverb,
Apache Kafka, DigitalOcean.

Web application for online monitoring of ATM service routes
Senior Software Engineer | Aug, 2025 – Dec, 2025.
Responsibilities:

● Developed backend REST API for route tracking and escalation management.

● Configured WebSocket server for real-time data synchronization between
the field and managers.

● Developed a convenient web interface that allows the manager to
effectively track routes and respond to escalations that arise on the
route.
● Prepared clear documentation for a quick start with the web application.
● Integrated Notifications for efficient message delivery.
Tech Stack: Laravel, React, WebSocket, OpenStreetMap

Company for Elevator and Lifting Devices Setup and Installation
Lead Software Engineer | Jan, 2023 – Nov, 2024.
Responsibilities:

● Developed and deployed a high-performance PHP (Laravel) API enabling
real-time communication between elevator operators and passengers,
handling up to 100,000 requests per minute and reducing response time by
50%.
● Designed and implemented a scalable messaging architecture using MQTT and
WebSockets to ensure reliable message delivery.
● Authored comprehensive API technical documentation (Swagger),
significantly accelerating frontend team integration.
● Collaborated closely with product managers and stakeholders to define
project requirements and roadmaps.
Tech Stack: PHP, Laravel, React, MQTT, WebSocket.
Fiber Optic Laying Services Company
Senior Software Engineer | Jan, 2022 – Dec, 2022.
Responsibilities:

● Designed and developed APIs for an order processing service and a
materials accounting and procurement system, increasing order processing
speed by 30% and optimizing inventory levels.
● Developed database architecture to support complex business processes,
ensuring data integrity and high performance.
● Configured inter-service message processing with Apache Kafka,
integrating various internal systems and reducing data latency.
● Regularly conducted code reviews for colleagues and actively participated
in evaluating new tasks and identifying optimal solutions.
Tech Stack: PHP, Laravel, Python, Kafka, Vue js

Online Platform for Selling Plants and Gardening Supplies
Lead Software Engineer(Freelance/Direct Contract) | Nov, 2021 –
Oct, 2022.
Responsibilities:

● Led API development (Laravel, PHP) for an e-commerce platform supporting
thousands of unique users and transactions.
● Designed and implemented system architecture to ensure seamless platform
operation during peak loads, significantly reducing error rates.
● Developed a personalized product recommendation system that analyzed
authenticated user behavior (purchases, search queries, page visits,
abandoned carts) to generate tailored product lists for email campaigns,
enabling fast and effective personalized offers.
● Configured and customized the administrative panel (Laravel Nova),
improving order processing efficiency for managers.
● Utilized AWS services to optimize data storage and communications.
● Optimized product upload and update processes, cutting upload time from 6
hours to 30 minutes.
● Mentored junior developers, conducting code reviews and fostering best
practices within the team
Tech Stack:Laravel, Laravel Nova, AWS, PHP, MySQL, React, Vue js

Meditation APP
Senior Software Engineer | Jun, 2021 – Dec, 2021.
Responsibilities:

● Developed and maintained the API (PHP, Laravel) for a Ukrainian
meditation and relaxation application.
● Integrated Firebase Notifications for efficient message delivery.
● Refactored the existing codebase, leading to improved performance and
simplified future maintenance.
● Actively participated in technical documentation efforts and task
estimation.
Tech Stack: Git, PHP, MySQL, Laravel, Laravel Nova, AWS, Firebase, Swagger
Reviews and recommendations APP
Software Engineer | Nov, 2020 – May, 2021.
Responsibilities:

● Developed and maintained the API (PHP, Laravel) for a mobile app focused
on cafe and restaurant reviews, ensuring rapid loading of a high volume
of daily reviews.
● Customized and configured Laravel Nova for efficient content management.
● Integrated Firebase Notifications and Google Services to enhance user
experience and expand functionality.
Tech Stack: Git, PHP, MySQL, Laravel, Laravel Nova, AWS, Firebase,Google
Services, Swagger

API Development for E-commerce Industry Websites
Software Engineer | Nov, 2019 – Aug, 2020.
Responsibilities:

● Developed and deployed a REST API (Laravel, PHP, MySQL) for a used goods
buying and selling platform.
● Engineered core backend components and implemented comprehensive testing
protocols, securing high fault tolerance and system stability.
● Integrated an auction system with a unique selling mechanism for limited
collections. I built the backend to handle real-time bids, manage auction
timers, and connect results to the order fulfillment process, ensuring
fair bidding.
Tech Stack: Laravel, REST API, PHP, MySQL

Warehouse Management Platform
Software Engineer | Feb, 2019 – Oct, 2019.
Responsibilities:
● Developed backend functionality (Symfony, PHP, MySQL) for a warehouse
management platform, optimizing processes for delivery organization,
inventory control, and procurement.
● Conducted thorough project testing, ensuring the absence of critical
errors and correct system operation.
● Created technical documentation, which simplified onboarding for new team
members.
Tech Stack: Symfony, PHP, MySQL, JS, JQuery, Google Services

Packaging manufacturing company
Software Engineer | Jun, 2018 – Jan, 2019.
Responsibilities:
● Developed a production line management system (PHP, Slim, MySQL) for a
manufacturing enterprise, increasing production efficiency and enabling
rapid response to emergency line stoppages.
● Conducted comprehensive system testing, ensuring its stable and
uninterrupted 24/7 operation.
Tech Stack: PHP, Slim, MySQL, JS, JQuery, Twig, HTML, CSS

IT Support & Development Company
Technical Support Engineer / Junior Software Engineer | Aug, 2016
– May, 2018.
Responsibilities:
● Provided technical support for enterprise systems and assisted the
development team with bug fixing and minor feature implementation.
● Gained foundational commercial experience in software development
lifecycle, debugging, and database management.

FOREIGN LANGUAGE SKILLS

English — Upper-Intermediate

Ukrainian — Native