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Full Stack Engineer with 5+ years building and evolving large-scale UI platforms in TypeScript-first environments. Experienced owning features end-to-end across regulated fintech and SaaS products - from architectural decisions and roadmap input through deployment and post-deploy monitoring. Strong background in performance engineering, component reusability, and maintaining code quality through rigorous testing and code reviews. Experienced in AI-assisted development tooling to accelerate delivery cycles. Track record spanning Germany's first licensed crypto savings platform, a B2B logistics SaaS, and a payroll system scaled from 50 to 3,000+ concurrent users.…Full Stack Engineer with 5+ years building and evolving large-scale UI platforms in TypeScript-first environments. Experienced owning features end-to-end across regulated fintech and SaaS products - from architectural decisions and roadmap input through deployment and post-deploy monitoring. Strong background in performance engineering, component reusability, and maintaining code quality through rigorous testing and code reviews. Experienced in AI-assisted development tooling to accelerate delivery cycles. Track record spanning Germany's first licensed crypto savings platform, a B2B logistics SaaS, and a payroll system scaled from 50 to 3,000+ concurrent users.

Alex Louttchenko

Full Stack Developer, Web Developer, Software Engineer, +2

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Full Stack Engineer with 5+ years building and evolving large-scale UI platforms in TypeScript-first environments. Experienced owning features end-to-end across regulated fintech and SaaS products - from architectural decisions and roadmap input through deployment and post-deploy monitoring. Strong background in performance engineering, component reusability, and maintaining code quality through rigorous testing and code reviews. Experienced in AI-assisted development tooling to accelerate delivery cycles. Track record spanning Germany's first licensed crypto savings platform, a B2B logistics SaaS, and a payroll system scaled from 50 to 3,000+ concurrent users.…Full Stack Engineer with 5+ years building and evolving large-scale UI platforms in TypeScript-first environments. Experienced owning features end-to-end across regulated fintech and SaaS products - from architectural decisions and roadmap input through deployment and post-deploy monitoring. Strong background in performance engineering, component reusability, and maintaining code quality through rigorous testing and code reviews. Experienced in AI-assisted development tooling to accelerate delivery cycles. Track record spanning Germany's first licensed crypto savings platform, a B2B logistics SaaS, and a payroll system scaled from 50 to 3,000+ concurrent users.

Available to hire

Full Stack Engineer with 5+ years building and evolving large-scale UI platforms in TypeScript-first environments.
Experienced owning features end-to-end across regulated fintech and SaaS products - from architectural decisions and
roadmap input through deployment and post-deploy monitoring. Strong background in performance engineering, component
reusability, and maintaining code quality through rigorous testing and code reviews. Experienced in AI-assisted development
tooling to accelerate delivery cycles. Track record spanning Germany’s first licensed crypto savings platform, a B2B logistics
SaaS, and a payroll system scaled from 50 to 3,000+ concurrent users.

Skills

Experience Level

Expert

Expert

Expert

Expert

Language

English

Fluent

Russian

Fluent

Greek, Modern

Fluent

German

Beginner

Work Experience

Fullstack Software Engineer at SIDESTREAM GmbH

November 6, 2025 - Present

Full Stack Engineer at Lohnbot GmbH

August 1, 2024 - May 1, 2026

Owned UI platform features end-to-end for an Austria payroll SaaS (specs, architecture decisions, production deployment, and monitoring) and collaborated with the German product team on roadmap planning, localization, and compliance requirements. Designed a Firestore key compression dictionary layer to cut infrastructure costs ~35% and improve platform performance by ~70% without requiring full data migration. Eliminated cascading React re-renders in the employee dashboard by refactoring Redux selectors/list-data flow, resolving UI freezes and scaling from ~50 to 3,000+ concurrent records. Migrated core tables to AG Grid Enterprise for virtualized/sortable responsive views and built a TOTP-based MFA system with QR provisioning plus password-gated deactivation via Firebase Admin SDK. Built CI/CD in GitHub Actions with PR preview deployments, Cypress E2E/performance regression tests against golden benchmarks, and post-deploy monitoring hooks; integrated Copilot into the daily workflow.

Fullstack Software Engineer at Lohnbot GmbH

August 1, 2024 - Present

Full Stack Engineer at SideStream GmbH

September 1, 2023 - June 1, 2024

Owned frontend platform architecture end-to-end for a B2B logistics SaaS supporting warehouse operators and drivers on shop-floor tablets and mobile. Built a real-time rental availability calendar to improve instant visibility and shorten the booking cycle. Implemented live delivery-driver tracking with map view and status updates to support real-time machine handovers for both customers and operations. Co-designed REST APIs for availability, booking, and tracking flows; implemented data layers in Node.js across SQL and NoSQL using an ORM. Translated complex industrial workflows into a mobile-friendly UX for non-technical warehouse staff, reducing training overhead and operational errors.

Full Stack Engineer at Coindex GmbH

July 1, 2021 - September 1, 2023

Contributed to frontend architecture decisions for Germany’s first licensed crypto savings platform, balancing rapid iteration with audit, compliance, and security requirements of a regulated fintech environment. Implemented secure authenticated user flows and portfolio dashboards; contributed to component-library work and collaborated with product/design/backend in an Agile setup. Participated in code reviews and knowledge-sharing to maintain quality standards in a fast-moving, compliance-constrained codebase.

Fullstack Software Engineer at Coindex Gmbh

July 1, 2021 - September 30, 2023