Mahdi Gheysari

Front-End Developer at Action Model

Built Actionist, an Electron desktop workflow builder using React, TypeScript, and React Flow, powering 1,200+ active automations. Added LLM-powered command parsing to describe workflows in natural language, reducing setup time from 12 minutes to under 5 minutes. Shipped a Node.js workflow runner with retry/backoff policies, achieving 99.4% successful runs across 10,000+ monthly executions. Coordinated weekly design reviews with product and backend engineers to resolve integration issues within 24 hours and maintain a 2-week release cadence.

Front-End Developer at HooshinAI

Rebuilt the chatbot UI in Next.js/TypeScript with streaming responses and GPU image previews, reducing perceived latency by 800 ms per turn. Localized the product into 6 languages via shared i18n catalogs, unlocking pilots in 5 regions. Ran twice-weekly design + backend syncs; delivered 9 sprints in 10 weeks. Profiled hot components and implemented smart caching, cutting first-interaction time from 3.1 s to 2.6 s and lifting day-1 retention from 62% to 72%.

Full-Stack Developer at Boosty

Delivered a React/TypeScript dashboard suite of 50+ screens with multi-step forms and RBAC, reducing onboarding tasks for account managers by 35%. Integrated Stripe subscriptions, invoicing, and tax handling across 5 currencies, pushing payment errors below 0.2%. Built shared UI kits plus messaging, calendar, and email modules reused by 3 business units, cutting duplicate front-end code by 40%. Migrated the monorepo to PNPM Workspaces and optimized CI, shrinking build times from 18 minutes to 7 minutes for the distributed team.

Front-End Developer (Freelance) at Upwork

Built a scientific word processor in React + Syncfusion supporting 200+ concurrent annotations via canvas batching and virtualization. Launched a localization SaaS with PrimeReact that processed 50k keys/day and exposed staged translation workflows for non-technical PMs. Delivered a ReactFlow ER designer that exported SQL/Prisma schemas, saving backend teams 6 engineering hours per project. Standardized clients on an atomic-design monorepo, reducing time-to-first-release from 3 weeks to 10 days. Coordinated async reviews with clients across 10+ countries, keeping revision cycles under 48 hours despite time zones.

Front-End Developer at Micahguru

Delivered 2FA enrollment, client-request queues, and ad campaign setup screens in React/TypeScript, increasing weekly active users by 18%. Introduced a PNPM/Nx monorepo that unified 4 frontend packages and eliminated dependency conflicts. Led the Stripe billing UI and webhook testing, helping the team pass PCI audits with zero production rollbacks.

AI Researcher at Atripa

Developed an LSTM-based model to predict open days in dairy cows and published an ISI research paper. Built a decision support system (DSS) using React, Next.js, and FastAPI/Flask, enabling interactive analysis of key farm metrics with responsive charts and dashboards.

Front-End Developer at PaykanPars

Led a 4-person React/Next.js team modernizing an e-commerce stack used by 1.2k monthly buyers, increasing conversion by 14%. Added Service Worker offline caching and image prefetching, cutting median load from 4.2 s to 2.8 s and lifting repeat sessions by 22%. Built SignalR dashboards that shortened customer-support response time from 15 minutes to under 9 minutes. Delivered RBAC-specific control panels, reducing account setup calls by 30%. Authored 500+ Jest/Playwright tests, raising coverage from 32% to 78% and halving post-release bug reports.