Contact information

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Work experience

Automation AI Engineer (n8n/JavaScript/Python) | Full-Stack Developer

from 06.2025 to now (1 year)
Hajus AG, Дистанційно (IT)

Building automation, integrations, and self-hosted Python infrastructure for pan-European e-commerce operations.

- Designed and maintain 350+ workflows in n8n.io and Windmill across 11+ marketplaces (Bol.com, eBay, Mirakl, OBI/VTEX, Metro DE, Praktiker.de, Pigu, Aukro, Okazii)
- Built 5+ production Python micro-services on Coolify (FastAPI/Flask + Playwright + Docker) — marketplace publishing, stock sync, UI automation with TOTP 2FA; health-checks, cron, memory limits, GitHub auto-deploy
- Integrate Odoo (JSON-RPC) ↔ Bitrix24 ↔ marketplace APIs into a unified pipeline for orders, invoicing, and delivery confirmation
- Built Pricing Intelligence System: detects negative-margin products, fetches competitor prices via SerpAPI, auto-updates prices with custom JS algorithm
- Developed eBay ↔ Odoo messaging: auto-fetch buyer messages, create support tickets, reply back to eBay
- Implement AI categorization and content generation (OpenAI, Gemini, xAI Grok incl. Vision) with structured output and fallback chains
- Architected AWS image pipeline (S3 + CloudFront + Thumbor), cut hosting costs by 70%; Bitrix24 error monitoring improved reliability by 40% and cut manual processing time by 60%

Tech Stack: n8n.io, Windmill, Python, JavaScript, FastAPI, Flask, Playwright, Docker, Coolify, Odoo (JSON-RPC), Bitrix24, VTEX, Metro DE, eBay, Mirakl, AWS, OpenAI, Gemini, xAI Grok (Vision), SerpAPI

Front-End Developer (internship)

from 11.2023 to 11.2024 (1 year)
SoftServe, Львів (IT)

- Participated in a volunteer project, gaining hands-on experience with new technologies and delivering projects under tight deadlines.
- Developed user-friendly web applications using HTML, SCSS, and React.js, with backend development in Node.js.
- Managed project version control via Git and automated workflows with Git Actions, ensuring seamless collaboration.
- Ensured code quality with SonarQube and performed unit testing using Jasmine, Jest, and React Testing Library.
- Key technologies: SCSS, React.js, Node.js, MongoDB, Git, GitHub, SonarQube, Jasmine, Jest.

Project Engineer

from 06.2016 to 10.2022 (6 years 5 months)
Eco -Techgroup, Львів (Будівництво, архітектура, дизайн інтер'єру)

- Led end-to-end management of engineering projects, including cross-functional team collaboration, site visits, documentation review, and compliance assurance.
- Efficiently handled procurement, budget monitoring, and client/stakeholder communication, ensuring project success and satisfaction.
- Dedicated time to creating drawings, generating business offers, and maintaining communication with clients.

Education

SoftServe Academy Student

WebUI/Frontend development, Львів
Unfinished higher, from 2023 to 2023 (less than 1 year)

- Completed an intensive WebUI/Frontend development course with hands-on projects and team collaborations.
- Gained proficiency in frontend development technologies like React, JavaScript, and CSS, while actively participating in coding exercises, workshops, and code reviews.
- Key technologies: JavaScript, HTML5, CSS, SCSS, React.js, Angular,Node.js, SQL, Git, Bootstrap, MaterialUI.

European University

Computer Science (with Honors), Львів
Higher, from 2022 to 2023 (1 year)

I completed a Master's program in Computer Science at the European University, solidifying my theoretical foundation and complementing my practical experience gained through various IT-related projects.

Lviv National Environmental University

Energy and Electrical Engineering Systems, Львів
Higher, from 2009 to 2016 (7 years)

Additional education and certificates

SoftServe Academy - COMPLETE WEBUI ENGINEER COURSE

10/2022-12/2023
Certificate

All my certificates

2022-2024
Certificate

Portfolio

2022-2024
Certificate

EF SET English Certificate 57/100 (B2 Upper Intermediate)

2024, травень
Certificate

Angular (ITWDN)

грудень 2023 - лютий 2024
Certificate

Knowledge and skills

• Стресостійкість
• HTML
• JavaScript
• SASS
• GitHub
• TypeScript
• Bootstrap
• Redux
• React
• CSS
• Node.js
• Figma
• WordPress
• Git
• JQuery
• Webpack
• Gulp

Language proficiencies

• English — above average
• Ukrainian — fluent

Additional information

Portfolio: https://portfolio-shamarin-leonid.vercel.app

Full-stack developer specializing in workflow automation, e-commerce integration, and self-hosted Python micro-services. Comfortable across the stack — from Python backends (FastAPI/Flask) and DevOps (Docker, Coolify) to frontend (React, Angular, TypeScript). Strong team player with experience in version control, automated testing, and delivering production systems on time. Passionate about continuous learning and committed to high-quality, measurable-impact solutions.