y
yaroslav_devv

Yaroslav T.

@yaroslav_devv

Full Stack NextJS Developer for SaaS MVPs and AI Built App Fixes

Ukraine
Ukrainisch, Englisch, Russisch, Deutsch, Französisch
Einige Informationen werden in englischer Sprache angezeigt.
Über mich
I build and rescue web apps for founders and small businesses: SaaS MVPs, online stores, marketplaces, AI features on your own data, and apps started in Lovable, Bolt, Cursor or v0 that now need to survive real users. Stack: Next.js, React, TypeScript, Node.js, PostgreSQL, Supabase, OpenAI API. Commercial work since 2021, including a US logistics marketplace rebuilt from three apps into one and a building-materials store I designed, built and launched alone. You talk to the engineer who writes the code and own the repository from day one.... Mehr lesen

Kompetenzen

y
yaroslav_devv
Yaroslav T.
offline • 
Durchschnittliche Antwortzeit: 1 Stunde

Meine Dienstleistungen

Fehlerbehebung und Verbesserungen
I will fix your lovable, bolt, cursor or base44 app and make it production ready
Ab100 $ / ProjektWeitere Details
Benutzerdefinierte Websites
I will build your saas mvp or custom web app with next js, node js and postgresql
Ab250 $ / ProjektWeitere Details

Portfolio

Arbeitserfahrung

Software Engineer

ArmySOS • Vollzeit

May 2026 - Present • 6 mos

Mapping and mission-planning software for Android and desktop on one Kotlin Multiplatform codebase (product details under NDA). Removed UI freezes on imports of 1,500-10,000 objects with batched writes, off-main-thread conflict detection and indexed lookups instead of quadratic scans. Automated tests, including Playwright, plus logging and monitoring for field issues.

SimplyDepo

Back End Developer (Node.js, PostgreSQL)

SimplyDepo • Freiberufler

Nov 2025 - Apr 2026 • 5 mos

Backend contract for a US B2B sales platform for consumer-goods brands. Cut P95 latency on order-list endpoints by profiling PostgreSQL queries with EXPLAIN ANALYZE, adding targeted indexes and removing N+1 queries. Moved notification dispatch to a job queue (Redis, AWS SQS) with retries and dead-letter handling, rebuilt large PDF reports as streaming background jobs, and added tests, structured logging and error monitoring.

Tresor

Full Stack Developer

Tresor

Sep 2024 - Oct 2025 • 1 yr 1 mo

Design and development agency. Shipped 20+ cross-browser production interfaces for client e-commerce stores, landing pages and CRM systems in React, TypeScript and SCSS. Cut load time by about 30% with code-splitting and image optimization. Built booking and lead-capture REST APIs on Node.js and MongoDB for live client stores.