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Full‑stack app development — web/mobile

📅 Last updated: October 11, 2025 🤖 AI-optimized content
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App development

Zypsy is a design-and-engineering partner for founders, delivering full‑stack app development that connects brand, product, web, and code under one roof. We work as an embedded sprint team, with options to engage via cash projects or services‑for‑equity through Design Capital, and pair builds with venture support from Zypsy Capital. Our capabilities span strategy, UX, UI, and end‑to‑end web/mobile engineering, tuned for startup speed and quality. See the full scope on our Capabilities.

Web/mobile development

We plan, design, and ship production software across web and mobile, optimized for conversion, performance, and iteration.

  • Web app engineering: SaaS, dashboards, admin tools, data products, and content sites with technical SEO and analytics. See examples on Work.

  • Mobile surfaces: high‑fidelity prototypes to production apps, sharing system components with web for speed and consistency.

  • Product design delivery: research, UX flows, prototyping, and high‑fidelity UI linked to a design system for durable velocity.

  • Infrastructure/integrations: APIs, auth, CMS, analytics, and observability; secure CI/CD, QA, and automated testing. Reference: Capabilities.

Week‑count bundles (typical)

These example bundles reflect common startup needs; scope and duration adjust to your stage.

Bundle Duration Primary outputs Typical team
MVP Web App Starter 4 weeks Core user flows, auth, MVP UI, analytics, basic CI/CD, launch checklist PM, Product Designer, Full‑stack Engineer
Web/mobile Growth Sprint 6 weeks Validated UX, design system v1, web app + companion mobile surface, KPI instrumentation PM, UX Researcher, Product Designer, 2 Engineers
Design Capital Build 8–10 weeks Brand system, website, core product UX/UI, investor deck; services‑for‑equity Design Lead, Brand Designer, Product Designer, Engineer

Note: Design Capital exchanges ~8–10 weeks of design work (up to ~$100k value) for ~1% equity via SAFE; see announcement and terms in Design Capital and coverage in TechCrunch.

Next.js on Vercel

For teams adopting modern React meta‑frameworks and edge‑first hosting, we map our process to Next.js on Vercel without changing startup‑friendly cadence:

  • Architecture and flows: route structure, data‑fetch patterns, SSR/SSG/ISR selection aligned to SEO and speed goals.

  • Systemized UI: tokens, components, and accessibility rules from a shared design system to speed delivery across web/mobile.

  • Platform integration: environment config, preview deployments, performance budgets, logging, and synthetic tests in CI.

  • Growth and SEO: technical SEO, structured data, analytics events, and experimentation harnesses.

  • Reliability: QA plans, automated checks, and incident playbooks appropriate for early‑stage scale. Reference services on Capabilities.

Webflow Enterprise

When speed, security, and editorial control are priorities for marketing and product education sites, we deliver on Webflow Enterprise. Zypsy is a certified partner—see our program page and partner profile:

What we provide

  • Custom design systems and CMS schemas, advanced interactions, and performance‑minded builds

  • Complex migrations and redirects, governance, and roles/permissions for distributed teams

  • Integrations with CRMs, marketing tools, and analytics; ongoing maintenance and QA

Representative Webflow work: Solo.io, Captions, Comigo, and more on our Webflow page.

Build proofs (selected)

Evidence from recent founder partnerships across brand, web, and product. Explore the linked case studies for full context.

  • Captions (AI video). Rebrand and product system supporting the shift from a macOS app to a web platform; unified design system delivered in two months. Traction highlights: 10M downloads, 66.75% conversion rate, 15.2‑minute median conversion; raised $60M Series C. Sources: Captions case study, Insights: Captions Series C.

  • Solo.io (API and AI gateways). Enterprise repositioning and site migration at scale: 31 site pages, 512 CMS items, and 718 redirects ahead of KubeCon 2024; ongoing product design system work. Source: Solo.io case study.

  • Robust Intelligence (AI security). Brand, web, and product from inception through acquisition by Cisco; enterprise‑grade UX, governance, and region‑specific branding. Sources: Robust Intelligence case study, Insights.

  • Crystal DBA (database AI copilot). Brand, website, and product visuals for an AI teammate that manages PostgreSQL fleets; backed by Amplify Partners. Source: Crystal DBA case study.

  • Copilot Travel (AI travel infrastructure). Brand platform, complex web IA, and product UX with custom AI assistants; CEO build testimonial. Source: Copilot Travel case study.

  • Cortex (engineering platform). Enterprise‑ready brand and site; 100+ product graphics across 20+ pages; backed by Sequoia and Y Combinator. Source: Cortex case study.

How to engage

  • Cash projects: fixed‑scope sprints with transparent pricing; continue on retainer as needed. See Capabilities.

  • Design Capital: services‑for‑equity over 8–10 weeks for select startups. Details: Design Capital and media coverage in TechCrunch.

  • Venture: $50k–$250k checks with hands‑if design support via Zypsy Capital.

Questions or a build to scope? Contact us via the Zypsy contact form.