In the last 5 years, I designed, developed, and delivered various applications for different markets and customers from idea and architecture concept to support phase. Besides extensive experience in software development, I also used to do project management and prepare commercial plans. In addition, I used to manage a team of 4 people and performed competency management duties.Key Achievements & Projects@ Team-lead Software Engineer | AppVales (Traveltek) | May 2023 – Present (1 yr 8 mos)* Modernized legacy Perl system to Python (FastAPI) and React.js, enhancing scalability and reducing maintenance costs.* Led sprint planning, code reviews, and stakeholder communications;* Managed CI/CD pipelines with Terraform and GitHub Actions, enhancing integration and deployment processes.* Integrated GraphQL for client APIs and implemented Datadog & Sentry to monitor and resolve issues.* Facilitated collaborative development through agile leadership, team coordination, and risk management.Key technologies:Python (FastAPI), PostgreSQL, React.js, AWS Tools, GraphQL, RESTful APIs, SQLAlchemy ORM, PyTest.@ Web & Software Python Developer, Solution Architect, DevOps | Singapore Job and Tuition | Jan 2022 – Jun 2023 (1 yr 6 mos)* Managed backend development for standalone website clusters, admin panels, and Telegram bots.* Implemented RESTful APIs, JWT authentication, and features like SMS/email modules, enhancing overall system functionality.* Utilized Nginx and Gunicorn for routing, SSL management, and performance optimization.* Improved data consistency and automated routine tasks; resolved issues such as data duplication.Key technologies:Python, Flask, RESTful API, MongoDB, RabbitMQ, JWT, Linux, Nginx@ Web & Software Python Developer | DigSee | Dec 2020 – Mar 2022 (1 yr 4 mos)* Developed and maintained bots for the PayForSay platform using Django, SQLAlchemy, and MySQL.* Optimized SQL queries for large datasets, achieving sub-millisecond response times.* Trained interns and conducted code reviews; contributed to decision-making on optimization and features.@ Full-stack Python Developer | Freelance | Jul 2020 – Nov 2020 (6 mos)* Designed and developed a web application for a Ukrainian entrepreneur, including a gallery and admin panel using Flask.* Implemented content management systems and DNS settings; built an API for managing image files.
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Senior Python DeveloperVimmiKyiv, Ua -
Python DeveloperAppvales May 2023 - PresentUkraineAt AppVales, I worked on Cruise Connect for Traveltek, a UK travel tech leader. We modernized their Perl system to Python and React.js microservices, improving scalability and reducing maintenance costs.I progressed from senior developer to team lead. As Team Lead, I managed sprint planning, code reviews, and stakeholder communication. I fostered independent decision-making and tackled challenges like updating shared libraries and migrating large clusters. -
Python DeveloperUpwork Feb 2022 - Jun 2023Kyiv City, UkraineTelegram Bot API, MongoDB, Flask-Admin, Flask-RESTXI am developing and maintaining several applications. The products of continuous work are several standalone clusters consisting of a website, an admin website, and a telegram bot. The websites' frontend was handled by different contractors.Singapore tutor searching and tuition offering service 🧑🎓:Website 🌐: https://tuitionassignments.com.sg/Telegram bot 🤖: @SgTuitionBotTop 3 Channels 📣: https://t.me/SgTuitionAgencyhttps://t.me/SgTuitionsJobhttps://t.me/SgTuitionsAssignments[🔧 Work in progress 🔧] Singapore job seeking and posting service 👷🧑🏭:Backend for Website 🌐 [ under construction ]: https://singaporejobs.com.sg/Telegram bot 🤖: @SgJobBotTop 3 Channels 📣: https://t.me/SgPartTimeAgencyhttps://t.me/SgFullTimeAgencyhttps://t.me/SgJobAgency -
Python EngineerDigsee Oct 2020 - Jan 2022Zaporizhzhya, UkrainePayForSay https://payforsay.com/en/Django, Django Admin, MySQL, SQLAlchemy, Git, Linux, Docker, Telegram Bot API, Telegram User Bot, aiohttpPayFor Say is a digital word-of-mouth radio marketplace and promotion platform. The engine is Telegram Bot API.The technical challenge comes from the application's design: 1 master process which spawns N number of subprocesses that shared the same memory. The project relied on Context Mixin and class inheritance. The project was first written as functional and then refactored as Object Oriented structure. I got into the project 30 days into the development phase (from level 0.1). Initially, my role was to implement the business logic of the project in a task-to-task style. Later on, I was trusted with the development of my own type of bot - A publisher bot. Further on, I was involved in making decisions for project optimization and new features. I maintained the code from bugs and implemented new features.Dealt with designing and managing a codebase of ~10 typical but different applications. Upkeep and modification of code so that they are up to date.Writing sub-millisecond queries for tables with 1-4 Mil items in SQLAlchemy + MySQL.Expanding and refactoring database models and migrating using Django migration.Maintaining and troubleshooting VPS on the Google Cloud Platform. Supervised and training of trainees. Performance review. Code review.CI/CD workflow -
Freelance Full-Stack Web DeveloperПредприниматель May 2020 - Oct 2020Zaporizhzhya, Ukrainehttps://cherniavskiy-design.com/Flask, Bootstrap, jQueryIn my midterm season I have began working on small project for Ukrainian independent entrepreneur. The scope of the project was to provide a graphically pleasing landing page with Gallery and an admin panel to maintain the content of the Gallery. The project is written entirely on Flask and minimal jQuery features. The project is delivered free of charge.
Frequently Asked Questions about Oleksandr Pysariev
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Oleksandr Pysariev works for Vimmi
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Oleksandr Pysariev's current role is Senior Python Developer.
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