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Hi, I’m Vilmos Zoltan Kiss, a frontend-focused software engineer who loves turning slow, complex applications into fast, reliable products. I design and build scalable React frontends with Next.js, TypeScript, and Node.js backends, delivering cohesive experiences across enterprise SaaS, healthcare, legal, and energy domains. With 8+ years of experience across diverse teams, I thrive on collaboration, accessibility, and performance. I enjoy turning business constraints into polished products, and shipping features quickly while keeping code quality and reliability high.…Hi, I’m Vilmos Zoltan Kiss, a frontend-focused software engineer who loves turning slow, complex applications into fast, reliable products. I design and build scalable React frontends with Next.js, TypeScript, and Node.js backends, delivering cohesive experiences across enterprise SaaS, healthcare, legal, and energy domains. With 8+ years of experience across diverse teams, I thrive on collaboration, accessibility, and performance. I enjoy turning business constraints into polished products, and shipping features quickly while keeping code quality and reliability high.

Vilmos Zoltan Kiss

Full Stack Developer, Front-End Developer, Web Developer, +2

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Hi, I’m Vilmos Zoltan Kiss, a frontend-focused software engineer who loves turning slow, complex applications into fast, reliable products. I design and build scalable React frontends with Next.js, TypeScript, and Node.js backends, delivering cohesive experiences across enterprise SaaS, healthcare, legal, and energy domains. With 8+ years of experience across diverse teams, I thrive on collaboration, accessibility, and performance. I enjoy turning business constraints into polished products, and shipping features quickly while keeping code quality and reliability high.…Hi, I’m Vilmos Zoltan Kiss, a frontend-focused software engineer who loves turning slow, complex applications into fast, reliable products. I design and build scalable React frontends with Next.js, TypeScript, and Node.js backends, delivering cohesive experiences across enterprise SaaS, healthcare, legal, and energy domains. With 8+ years of experience across diverse teams, I thrive on collaboration, accessibility, and performance. I enjoy turning business constraints into polished products, and shipping features quickly while keeping code quality and reliability high.

Available to hire

Hi, I’m Vilmos Zoltan Kiss, a frontend-focused software engineer who loves turning slow, complex applications into fast, reliable products. I design and build scalable React frontends with Next.js, TypeScript, and Node.js backends, delivering cohesive experiences across enterprise SaaS, healthcare, legal, and energy domains.

With 8+ years of experience across diverse teams, I thrive on collaboration, accessibility, and performance. I enjoy turning business constraints into polished products, and shipping features quickly while keeping code quality and reliability high.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Beginner

Language

English

Fluent

Hungarian

Fluent

Spanish; Castilian

Advanced

Work Experience

Senior Software Engineer - Web Services at Vincit Solutions Oy

October 1, 2020 - August 1, 2025

Led development across multiple enterprise products, owning features from design to production maintenance; extended product from work management to a full project management platform, enabling budgeting and financial reporting for enterprise clients. Achieved significant UI performance improvements (~60%) in data-heavy interfaces through optimized rendering and data processing, enabling reliable large data exports (50k+ rows) using chunked processing. Architected a dynamic JSON-driven form engine enabling rapid creation of enterprise forms with out-front-end code changes. Designed a domain-driven architecture for a Laboratory Sample Management system, with full audit trails, history tracking, and multi-tenant SaaS patterns. Implemented secure authentication and authorization using Azure AD, Role-Based Access Control, and multi-tenant SaaS patterns across multiple products. Rebuilt Gantt planning app with improved performance and WCAG 2.1 AA accessibility, supporting complex project ti

Frontend Developer (Enterprise SPA) at Vincit

September 1, 2018 - December 1, 2020

Platform-focused frontend engineer for a large-scale Enterprise Asset Management SPA used across procurement, maintenance, warehousing, and administrative workflows. Contributed to core UI frameworks, workflow automation, navigation systems, and cross-application integrations. Improved data loading reliability and perceived load time by 8–12% across multiple workflows by resolving callback hell and promise waterfalls. Reduced manual input steps and user errors by ~30% across high-frequency forms via metadata-driven workflows, property inheritance, dedicated-field auto-fill, QuickAccess workflows, and create-flow protocols. Delivered major improvements to the SPA’s reusable UI framework, enhancing table, form, listing, input, and navigation modules across multiple business domains. Architected and shipped the Dashboard sub-system with drag-and-drop grid layouts, widget lifecycles, user-specific persistence, and 5+ custom widgets. Designed and maintained the SPA Navigation State Engi

Frontend Developer (Enterprise SPA) at Vincit Romania

October 1, 2017 - August 1, 2018

Frontend development for enterprise SPA across procurement, maintenance, warehousing, and admin workflows; contributed to core UI components, forms, listings, and early workflow features; improved data loading reliability and perceived load time; assisted with cross-site integrations.

Founder / E-commerce & Events at One Drop YoYo s

June 1, 2011 - December 1, 2020

Established an international online store serving customers in 50+ countries; managed product, logistics, operations, and customer support end-to-end; built brand identity; organized regional and national yo-yo competitions; led a team of 10–20 volunteers.

Ambassador & Product Designer at One Drop YoYo s

January 1, 2009 - Present

Brand ambassador and product designer; built flagship yo-yo models; collaborated with retailers on marketing; expanded brand visibility across 3 continents.

Founder / E-commerce & Events at YoYo Raven

June 1, 2011 - December 1, 2020

Founded an international online store; managed product, logistics, operations, and customer support; built brand; organized events.

Senior Software Engineer at Vincit Solutions Oy

October 1, 2020 - August 1, 2025

Led development across multiple enterprise products, owning features from design and delivery through production maintenance, working closely with product managers, designers, QA, and stakeholders.

Frontend Developer

October 1, 2017 - August 1, 2018

Remote frontend developer for a large-scale Enterprise Asset Management SPA; contributed to core UI frameworks, workflow automation, navigation systems, and cross-application integrations.

Founder / E-commerce & Events at Yo Yo Raven

June 1, 2011 - December 1, 2020

Founded an international online store serving customers in 50+ countries; managed product, logistics, operations, and customer support end-to-end; built brand website and led event logistics.

Ambassador & Product Designer at One Drop Yo Yos

January 1, 2009 - Present

Ambassador and product designer for an Oregon-based yo-yo manufacturer; designed flagship models and collaborated with retailers on social media marketing to grow brand visibility.

Full-Stack Consultant

September 1, 2025 - Present

Remote, Sep 2025 - present. Owned frontend architecture and built a pure-domain Excel-style selection engine (range, multi-select, keyboard navigation) decoupled from rendering for a law-firm time-tracking platform. Built a Node.js WebSocket service for real-time transaction processing, integrating external event streams (LetsExchange.io) with resilient reconnections and Dockerized deployment. Designed a scalable React component system for a mental health platform with structured content (Sanity CMS) integration and an optimized landing page that increased conversions. Investigated RabbitMQ failures and established a lab-ready UI-engine to reduce frontend deployments across 3+ products. Implemented a memory-efficient UI for real-time interfaces, introduced lazy loading, and cut initial data load. Led architecture for a configuration-driven UI to render dashboards, filters, forms, and tables from JSON schema across multiple products.

Senior Frontend / Full-Stack Engineer at Oy Finland

October 1, 2020 - August 1, 2025

Remote, Oct 2020 - Aug 2025. Owned a full-stack event-driven Node.js service in a distributed platform — consumed RabbitMQ domain events, maintained a version-gated MongoDB projection to reject stale or replayed events, and pushed real-time updates to browser clients via Socket.IO for UI data consistency without polling. Diagnosed and eliminated UI freezes on real-time interfaces handling large item sets, introduced lazy loading and reduced initial data volume. Optimized multi-criteria searches over 50K+ records using MongoDB aggregation and indexing, reducing query times to under 2s and enabling reliable concurrent filtering. Architected a configuration-driven UI engine to render dashboards, filters, forms, and table logic from JSON schema across 3+ products. Investigated RabbitMQ failures in a memory-paged Node.js consumer handling 100k+ messages and coordinated with DevOps to characterize failure modes across a distributed system. Built a standalone RabbitMQ setup to standardize q

Frontend Developer at Vincit

September 1, 2018 - December 1, 2020

Finland, Sep 2018 - Dec 2020. Designed and built the Navigation State Engine from scratch for a legacy jQuery SPA—enabling reliable multi-step workflows with tab restoration, modal return behavior, and cross-view state consistency across 20+ interconnected screens. Created the M-Files desktop embedding layer with a postMessage bridge and session handshake, enabling the shell to host embedded SPAs as a unified surface. Reduced manual input steps across high-frequency operational forms by introducing metadata-driven auto-fill, dependent-field validation, and quick-access workflows, cutting user errors across 5+ workflows.

Frontend Developer – Freelance

January 1, 2017 - December 1, 2017

Romania, Jan 2017 - Dec 2017. Delivered responsive web and e-commerce work for live client sites, focusing on UX, performance, and safe production changes.

Founder at Yo Yo Raven

June 1, 2011 - December 1, 2020

Founder and operator of an international e-commerce business serving customers in 50+ countries; grew from $1,000 initial investment to $80k+ lifetime gross revenue over 9 years. Improved customer purchase journey through hands-on work with conversion, storefront performance, and end-to-end order operations.

Full-Stack Consultant – Remote at Independent / Contract

September 1, 2025 - Present

Owned frontend architecture and built a pure-domain Excel-style selection engine for a law-firm time-tracking platform; designed a Node.js WebSocket service for real-time transaction processing; integrated external event streams (Let’s Exchange.io) with resilient reconnection and Dockerized deployment; architected a configurable UI layer used across multiple products, enabling non-engineering teams to ship features independently; diagnosed and resolved UI freezes handling 1,000+ items, introduced lazy loading to reduce initial data volumes.

Senior Frontend / Full-Stack Engineer at Oy – Finland

October 1, 2020 - August 1, 2025

Owned a full-stack, event-driven Node.js service in a distributed platform; consumed RabbitMQ domain events, maintained a versioned MongoDB projection to reject stale or replayed events, and pushed live updates to browser clients via Socket.IO for live data consistency; designed a configuration-driven UI engine (3+ products) enabling rapid feature surface shipping; implemented RBAC, audit trails, and full history tracking to meet compliance and traceability requirements.

Frontend Developer – Romania, Remote

October 1, 2017 - August 1, 2018

Delivered frontend features for distributed client projects, bridging RESTful services with modern SPA patterns; collaborated with design and backend teams to translate business constraints into robust UI and improved client-side performance.

Frontend Developer – Freelance at Freelance

January 1, 2017 - December 1, 2017

Built core UI components and integrated third-party services into internal SPAs; introduced automated tests and CI/CD basics; improved page speed, image optimization, and script loading without breaking core workflows.

Founder, E-commerce at Yo Yo Raven

June 1, 2011 - December 1, 2020

Founded and operated an international e-commerce business serving 50+ countries; grew initial revenue from $1K to $80K+ lifetime gross revenue over 9 years; optimized customer purchase journeys, storefront performance, and end-to-end operations to drive growth.