Web App Development
Web App Development Agency
An agency model that actually works: dedicated team assigned to your project, design and engineering under one roof, weekly progress visible in a real staging environment — not a status deck.
What an Agency Should Actually Provide (and Most Don't)
The word 'agency' has been watered down by firms that sell strategy decks and hand off execution to junior contractors. A real web app development agency provides a dedicated team that is accountable for the outcome — not just the hours billed. At Greta, 'dedicated team' means the engineers on your project are not split across five other clients, do not rotate off mid-project, and are available for a real-time conversation when a design decision needs to be made in the next 10 minutes, not the next two days.
Design and development under the same roof eliminates the most common source of project delays: the handoff. When the designer who created the component and the engineer implementing it are in the same Slack channel, a 'this won't work as a component because...' conversation takes 15 minutes. When they're in separate companies, it takes a ticket, a review, and a meeting. We run design and build in parallel by default — our engineers review Figma files as they're created, flag implementation concerns early, and start building the unblocked parts while design is still finalizing.
Transparent pricing is not a marketing tagline for us — it's a business model. We quote fixed prices for fixed scopes. If scope changes, we issue a change order with a new fixed price for the addition. You never receive an invoice that surprises you. We don't do retainer arrangements where the monthly fee is vague and the deliverables are 'engineering time.' Every engagement has a defined scope, a defined deliverable, and a defined price.
Our Approach to Web app development agency
Every project follows our 4-step vibe-coding process — AI handles the boilerplate, senior engineers handle the craft. From idea to live product in 3–7 days for MVPs.
Dedicated Team Assignment
Before kickoff, we introduce the specific engineers assigned to your project. Same people, start to finish. No mid-project rotations, no 'the person you were talking to left' surprises.
Design + Dev in Parallel
We don't wait for design to be 100% complete before starting development. We build the unblocked screens and infrastructure while design finalizes the complex flows — compressing the timeline by 30-40% without quality shortcuts.
Weekly Staging Reviews
Every week you get a staging environment URL with the latest build. No screenshot demos, no slide decks — real, working software you can click through, test, and share with stakeholders for feedback.
Launch + Post-Launch Support
We handle the production deployment, monitor the first 48 hours post-launch, and maintain a support window for the first two weeks. We've found that the first two weeks surface 90% of the edge cases that need fixing.
What You Get
Every web app development agency engagement includes these deliverables — scoped before we start, delivered before we invoice.
- Dedicated team lead and engineer assignments documented at kickoff
- Weekly staging builds with a change log of what's new each week
- Figma designs for all screens with annotated component specifications
- Full stack implementation: database, API, UI, deployment
- Project management: weekly status updates and milestone tracking
- QA: cross-browser and cross-device testing against acceptance criteria
- Production deployment with monitoring and error tracking
- Post-launch support window: 2 weeks of priority bug fixes
- Source code and infrastructure transferred at project close
- Retrospective session: what worked, what we'd do differently
Tech Stack We Use
Greta's agency projects run on Next.js 15, React 19, TypeScript, Supabase (PostgreSQL, Auth, Realtime), Stripe, Tailwind CSS, and Vercel. We use Linear for project management (visible to clients), Figma for design, and GitHub for code — all tools you can access and review in real time. No proprietary project tracking that disappears when the engagement ends.
Case Study
PLGOS — Agency-Led Full Engagement
PLGOS engaged Greta for a full-scope agency engagement: discovery, design system, full stack build, and launch. The project had a fixed deadline tied to a product hunt launch, which meant parallel workstreams from day one. Our design lead and lead engineer worked simultaneously — the engineer started on auth, database, and API while the designer finalized the onboarding flow. Weekly staging releases let the PLGOS founders share progress with their beta users and collect feedback that shaped the final feature set. The product launched on schedule, hit the #3 spot on Product Hunt, and onboarded 200 users in the first 48 hours.
Read full case studyPricing Transparency
Agency engagements start at $5,000 for an MVP and $15,000 for a full product build. All projects are fixed-price with scope locked at the discovery phase. Post-launch retainer support is available on a monthly basis for teams that want ongoing development capacity without hiring full-time.
MVP
From $5,000
3–7 business days
Full Build
From $15,000
2–4 weeks
All projects include full code ownership, two revision rounds, Vercel deployment, and one week of post-launch support. No hidden fees.
Frequently Asked Questions
What makes Greta an 'agency' rather than a freelancer or consultancy?
An agency provides a team — not a single person. At Greta, every project has at minimum a lead engineer and a design resource. Projects that need it get a second engineer for parallel development. You're not dependent on one person's availability or skill set.
How do you handle project management?
We use Linear for task tracking, which clients have read access to throughout the project. Weekly updates via email summarize what shipped, what's in progress, and any decisions that need your input. No sprawling Jira boards with 400 tickets.
Can we give feedback during the build, or do we have to wait until the end?
We actively want feedback during the build. Weekly staging releases are specifically designed for this. Feedback incorporated in week 2 costs almost nothing — feedback incorporated in week 6 is expensive. We frontload the review cycles.
Do you work on hourly retainers after launch?
We offer post-launch retainers, but they're scoped to deliverables, not hours. Instead of 'X hours per month,' we define what you'll receive: a feature per sprint, bug fixes, dependency updates, and performance monitoring. Outcomes, not time.
Can Greta work alongside our in-house team?
Yes. We've worked as an extension of in-house teams, embedded into their GitHub workflow and communication channels. We're comfortable being the 'build team' while your team handles product strategy and roadmap.
What industries do you have experience with?
SaaS, fintech, content tools, B2B platforms, e-commerce, and internal tooling. Our case studies span SEO Pilot (content), PLGOS (B2B SaaS), and FinTrack (fintech). We evaluate fit on a project basis.
How do I start a project with Greta?
Email hello@greta.agency or visit /contact. We'll set up a 30-minute discovery call, understand your project, and send a fixed-price proposal within 48 hours.
Ready to ship?
Start a Project With a Team That Stays Accountable
Start Your ProjectOr reach us directly at hello@greta.agency
Written by the Greta Agency team · Last updated April 2025