Максим

Maksym Mokryi
Senior Backend Python Developer | Team Lead & System
Architect
Remote / Hybrid

SUMMARY
20+ years building commercial software, with 16+ years focused on e-commerce,
payment processing, and trusted data systems. Senior Python backend engineer
CONTACTS
and team lead — I design and ship scalable APIs, optimize databases under real
[open contact info](look above in the "contact info" section) production load, and integrate AI tooling deeply into the development cycle to
[open contact info](look above in the "contact info" section) deliver faster.
[open contact info](look above in the "contact info" section)
KEY ACHIEVEMENTS
Kyiv, Ukraine
• Accelerated PostgreSQL workloads 5×–20× by redesigning schemas, refining
CORE STACK indexing strategies, and rewriting hot-path queries — directly reducing API
latency and infrastructure costs.
Python • Flask • FastAPI • • Earned Amazon SP-API Developer status with PII (Restricted Data) access —
SQLAlchemy • REST API granted Feb 2026 — and Etsy Open API commercial application approval.
PostgreSQL • MySQL • Redis Both required passing security, privacy, and compliance review.
AWS • Docker • Linux • Git CI/CD • Boosted engineering productivity by 30–40% by integrating Claude Code,
Vue.js 2/3 — working knowledge Google Gemini, and OpenClaw into daily development, code review, and
(admin UIs, ~6 mo) refactoring workflows.
PHP (legacy systems) • Lead developer on two production e-commerce platforms — Seller-Online
and UA-for-US — owning backend architecture end-to-end.
AI-AUGMENTED DEV • Architected and shipped integrations with 10+ marketplaces (Etsy, eBay,
Shopify, Amazon, …) and 6+ payment providers (PayPal, Stripe, Braintree, …).
• Claude Code • 16+ years working with payment systems and sensitive transactional data,
• Google Gemini including PCI-relevant integrations.
• OpenClaw
+30–40% productivity in daily WORK EXPERIENCE
engineering work.
Senior Python Backend Developer / Team Lead & System Architect
DATABASES Seller-Online LTD • Nov 2017 – Present (8+ years) • Kyiv, UA & Feasterville-
Trevose, US
PostgreSQL — 20+ years • Own backend architecture for Seller-Online and UA-for-US e-commerce
◦ Performance tuning & query platforms — services, data model, and integrations.
optimization • Delivered 5×–20× PostgreSQL performance gains via query optimization,
◦ Triggers, full-text search, indexing, schema rework, and EXPLAIN-driven tuning.
complex relations • Drove the full application process for Amazon SP-API Restricted Data (PII)
◦ Indexing strategies, EXPLAIN access — approved Feb 2026 — and Etsy Open API commercial approval,
analysis including security, privacy, and data-handling documentation.
MySQL — 20+ years • Embedded Claude Code, Google Gemini, and OpenClaw into the dev loop —
Redis — 3 years code generation, refactoring, debugging, and documentation — raising
personal output by 30–40%.
CLOUD (AWS) • Built REST APIs in Python (Flask + SQLAlchemy) serving production traffic for
marketplace, payment, and shipping flows.
• S3, DynamoDB (2+ years)
• Designed and operated AWS-hosted services: S3, DynamoDB, Lambda, API
• Lambda, API Gateway
Gateway, CloudFormation.
• CloudFormation, CloudTrail
• Lead a small engineering team — code review, architectural decisions,
• Load Balancer mentoring.
DEVOPS Full-Stack PHP Developer
Arsenal LTD • Jan 2012 – Sep 2017 (5y 9m) • Donetsk / Dnipro, Ukraine
• Linux administration (20+ years) • Built and maintained large-scale e-commerce features and back-office
• Git, GitLab CI/CD systems on PHP + MySQL/PostgreSQL.
• Docker
Full-Stack PHP Developer
Discon LTD • Jan 2008 – Dec 2011 (4y) • Donetsk, Ukraine
LANGUAGES
• Delivered customer-facing web apps and internal tools across the full stack.
English — B1–B2
Full-Stack PHP Developer
Ukrainian — Native
Ok-Checkout • Jan 2004 – Sep 2007 (3y 8m) • Donetsk, UA & Los Angeles, US
Russian — Native • Worked on a US-facing checkout and payment-processing product, gaining
early exposure to payment integrations and trusted-data handling.
SOFT SKILLS
System Administrator & IT Teacher
• Fast learner — adopts new tools Idea LTD / IT Step • Sep 1999 – Dec 2003 (4y 4m) • Donetsk, Ukraine
quickly • Administered Linux servers and taught IT fundamentals — the foundation for
• Analytical, automation-minded everything that followed.
• Self-organized & accountable
• Strong team collaboration KEY PROJECTS
• Problem solver
Seller-Online — Lead developer. seller-online.com
UA-for-US — Lead developer. ua4us.com
OK-CHECKOUT — US-facing payment/checkout product (project closed).

API INTEGRATIONS
• Marketplaces (8 years): Etsy, eBay, Shopify, Amazon, and others.
• Payments (15+ years): PayPal, Stripe, Braintree, Payoneer, LiqPay,
WayForPay.
• Shipping & tracking: DHL, FedEx, UPS, USPS, Ukrposhta, Nova Poshta.

EDUCATION
Donetsk State Technical University • 1995–2000
Faculty of Computer Science — Computer Systems and Networks.

ADDITIONAL TRAINING
• AWS Services course (2023)
• Python foundation course (2017)

AVAILABILITY
• Personal military deferment on family grounds — no draft interruption to
work.
• Workspace with redundant power supply and backup internet —
uninterrupted operation during regional outages.
• Full-time, remote or hybrid. Comfortable across US and EU time zones.

My experience extends beyond what fits in a CV — happy to go deeper in an
interview.