SaaS · Web productFull-cycle development8 months · ongoingOctober 2025 — ongoing
Estix.ai — a project estimation product from idea to public launch.
We built a SaaS for statistical PERT project estimation with AI assistance. Full cycle: architecture, design system, frontend, backend, integrations with AI agents, and launch.
Результати · Слайд 1 з 3
Client
Estix.ai
Niche
SaaS · Project estimation · Productivity
Period
October 2025 — ongoing
Service
Full-cycle web development
01 — Challenge
Build a product that replaces spreadsheets.
Estix.ai came in with a clear idea: teams still estimate projects in spreadsheets, lose data, and can't justify the numbers to clients. They needed a full-fledged SaaS where the entire process — from brief to final estimate — happens in one place.
Estix.ai came to us not with a marketing request, but with a product one: build a SaaS from scratch. The team had a clear vision of a product that would replace chaotic spreadsheets with a structured workspace powered by PERT methodology (three-point estimates) and an AI assistant that generates scope from a plain-text brief.
The task for our team — close the full cycle: architecture, design system, frontend, backend, authentication, integrations with AI agents, result export, share-link, billing. And do it at an iteration tempo that allows shipping updates weekly.
The team didn’t need outsource development — they needed a product partner that fully owns the technical side.
The starting constraints were specific:
- 01A stack of modern tools. Next.js 16, TypeScript, server components, modern rendering architecture.
- 02AI agents as a first-class citizen. Integration with agentic tools not as a one-off feature, but as part of the user workflow.
- 03Calculations transparent to the user.Every number in the product is based on the open PERT formula, without «magic coefficients».
02 — Approach
How we built the product.
We worked as a product team, not as a contractor. We split the work into phases with regular releases, focused on letting the user close the full path — from brief to PDF export — in a single day.
Phase 1 — Architecture and foundation. Set up the monorepo, picked the stack (Next.js 16 App Router, TypeScript, Postgres, server actions), built the authentication system, the Project → Scope → Tasks data models, and a design system with a signature cream/coral palette.
Phase 2 — Estimation engine. Implemented the statistical PERT logic (tE = (O + 4M + P) / 6, σ, P50/P80/P95 confidence targets), estimate composition (Dev + Discovery + PM + QA + Contingency), and live calculations with reactive updates.
Phase 3 — AI assistant. Integrated AI agents to generate scope from a pasted brief, with automatic breakdown into leaf tasks and suggestions for each task.
Phase 4 — Share & Export. Export to PDF/HTML/Excel, share-link with server rendering for read-only views, stakeholder-friendly format.
We work in a continuous cycle: weekly releases, joint planning sessions, a direct channel with the client’s product team.
Виконані послуги
What we actually delivered.
Five key directions that together produced a full-fledged SaaS product.
//01
Architecture and stack
Next.js 16 App Router + TypeScript + Postgres + server actions. Monorepo with a clear structure, optimized for team scale.
//02
Design system and UI
Custom design system with a cream/coral palette and typographic detailing (italic display, serif accents). Responsive on every device.
//03
PERT estimation engine
Three-point estimates with live σ calculation, P50/P80/P95 confidence targets, and estimate composition (Dev + Discovery + PM + QA + Contingency).
//04
AI assistant
Integration with AI agents: automatic scope generation from a brief, suggestions for each leaf task, controlled workflow with manual override.
//05
Share & Export
PDF/HTML/Excel export, share-link with server rendering for stakeholders, authentication with role-based access, billing integration.
Результати
A product in live development.
Work has been running since October 2025. Below are the key milestones based on the product’s current state.
0 → 1
Product from scratch. From idea to the publicly available product estix.ai.
8 mo
Of continuous development. Since October 2025 — weekly releases and new features.
Full-cycle
In-house team. Architecture, design, frontend, backend, AI integrations.
Product features: at a glance
As of June 2026AreaWhat’s builtStack
Project workspaceProject info, scope tree, three-point estimates, live confidenceNext.js 16 + server actions
AI scope draftPasted brief → AI breakdown into leaf tasks → suggestions for eachAI agents (Cursor, Claude, Copilot)
PERT enginetE = (O + 4M + P)/6, σ, P50/P80/P95 confidenceTypeScript + reactive store
Export & SharePDF / HTML / Excel + secure share-linksServer rendering, role-based access
Auth & billingEmail-based auth, free plan, paid tiersStripe + secure session management
Trusted by
Over 45+ companies already work with us
Contact
Want the same result?
Leave a request — we’ll set up a free 30-minute call, run an express audit, and show you what can be done with your product.
✓
Free consultationon the first call∅
No obligations— just a conversationSubmit a request
Takes a minute to fill out. Three fields and we're already thinking about your project.