berko.tech

🚀 berko.tech web and mobile engineering We build production software for web and mobile using react.js, next.js, node.js, typescript, and react native with expo. Small senior teams. Fast loops. Clean code. Predictable releases. You get smooth UI, reliable data, safe auth, and systems that scale. 🧩 What we do • Product discovery to working software with short cycles and clear success metrics • Full stack web apps that pass core web vitals and rank • Mobile apps that feel native and survive bad networks and background state • Payments, subscriptions, and role based access for B2B and consumer products • Admin tools, analytics dashboards, and reporting for operations and finance • Rescue missions for slow or fragile apps with a focus on performance and reliability 🌐 Web delivery • next.js with server side rendering, static generation, incremental regeneration • App router, route handlers, middleware, dynamic routing, edge rendering on vercel • State with react query, redux toolkit, or zustand • API design with rest and graphql, pagination, filtering, search, file upload, webhooks • Data with postgresql through prisma, mysql, mongodb, redis for cache and queues • SEO with metadata, sitemap, robots, image optimization, structured data 📱 Mobile delivery • react native with expo and typescript, react navigation, react query, redux toolkit, zustand • Reanimated and gesture handler for fluid UX, skia and svg for custom visuals • Offline first data with sqlite, realm, watermelon db, and mmkv • Background sync and retry, notifications with apns and fcm, deep links and universal links • In app purchases and subscriptions with storekit and google play billing, revenuecat for receipts • Analytics with firebase, amplitude, segment, with privacy and consent controls 🔐 Security and payments • Email and password, magic links, social sign in, two factor • SSO with oauth and openid connect • Sessions or tokens, secure storage, audit trails, least privilege roles • Stripe checkout or elements with idempotent webhooks, invoices, and dunning • Encryption in transit and at rest, secrets in CI, access reviews and runbooks ⚙️ Delivery and reliability • Monorepos with turborepo and pnpm, shared packages across web and mobile • Docker based environments, github actions, preview deploys on every pull request • Hosting on vercel and aws with s3, cloudfront, lambda, api gateway • Observability with sentry, logs, metrics, and alerts to chat • Feature flags, experiment toggles, safe rollbacks, zero downtime migrations 🧪 Testing • Unit and integration with jest and vitest • Component tests with testing library and storybook • End to end with cypress and playwright for web, detox for mobile • Contract tests for API clients and fixtures for critical flows