Anton Zaytsev

Senior Software Engineer

• Built an AI-powered design platform (AI Studio) from the ground up — partnered with product and design to integrate Gemini, Replicate, and RunPod for AI image generation, refinement, and vectorization; shipped community art gallery with GraphQL API; drove A/B experiments that increased user engagement by 25%
• Led a zero-downtime Rails framework upgrade from 5.0 to 8.0 — coordinated with 3 teams to migrate a 500K+ LOC monolith through 4 major versions, enabling authenticated encryption, CSRF protection, and Zeitwerk autoloading across 200+ models
• Architected real-time delivery tracking for custom print orders — collaborated with logistics and ops teams to integrate Uber and Nash courier webhooks for live shipment tracking, serving 50K+ orders/month
• Improved checkout conversion and payment reliability — added structured observability across Stripe/PayPal/Venmo payment lifecycle, fixed store credit rounding errors affecting ~2% of orders, and reduced payment-related support tickets by 60% (from 15+/week to under 6)
• Drove SEO improvements in partnership with the marketing team that increased indexed pages by 35% and organic traffic by 20% — implemented canonical URL normalization, breadcrumbs on search results, product reviews on PLPs, and facet link crawl control

Technologies: Ruby on Rails, GraphQL, PostgreSQL, Sidekiq, AWS, AI/ML APIs (Gemini, Replicate, RunPod)

Senior Back-end Engineer

• Redesigned talent screening workflows across client and talent portals — partnered with product and design teams to streamline the vetting pipeline, reducing screening cycle time by 15% for Toptal's network of 10,000+ freelancers
• Architected and optimized high-traffic acquisition pages handling 500K+ monthly visitors — implemented server-side caching strategies and performance tuning that improved page load times by 30%, contributing to higher signup conversion
• Led development of the talent-client matching engine — designed weighted scoring algorithms using GraphQL APIs and PostgreSQL full-text search, improving match acceptance rate by 20% and reducing average time-to-engagement by 3 days
• Mentored 2 mid-level engineers through code reviews and architecture pairing sessions, helping both advance to senior-level responsibilities within a year

Technologies: Ruby on Rails, GraphQL, PostgreSQL, Sidekiq, Redis

Senior Back-end Engineer → Engineering Manager

Progressed from Mid Developer to Engineering Manager in 3.5 years, ultimately overseeing 4 cross-functional teams (20 engineers) responsible for e-commerce platform, logistics, pricing, and supplier integrations.

• Launched JiffyShirts iOS app from concept to App Store — led a cross-functional effort with design and marketing, acquiring 15K+ downloads in the first year and opening a new mobile revenue channel
• Built automated competitive pricing intelligence system, scraping 10+ competitor prices daily to inform dynamic pricing decisions that protected $2M+ in annual margin
• Modernized front-end architecture by migrating from Asset Pipeline to Webpacker, reducing JavaScript bundle size by 40% and cutting median page load time by 1.5s
• Conducted 30+ technical interviews, built the team's interview rubric, mentored junior and mid-level engineers, and grew the engineering org from 8 to 20 engineers across 4 teams
• Architected fault-tolerant integrations with 10+ wholesale suppliers using async job processing — automated inventory sync for a catalog of 100K+ SKUs with 99.5% uptime

Technologies: Ruby on Rails, Sidekiq, PostgreSQL, AWS, Spree/Solidus, Jira

Full Stack Developer

Built e-commerce platforms on Spree, data collection pipelines processing 1M+ records, and web applications for international clients. Transitioned from PHP/Drupal to Ruby on Rails. Worked onsite in Australia for 7 months.

Key clients: Kiere Media (USA), Source Code Partners (USA), Concuria (Belgium), Untitled Studio (Australia), A2 Design (Russia), ADCI Solutions (Russia)

Technologies: Ruby on Rails, Sinatra, PHP, Drupal, PostgreSQL, Redis, Sidekiq