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Core Services
Next.jsSupabaseVercelEngineeringCustom Software

Custom Software Development Services | Next.js + Supabase

Your SaaS Workarounds Are Costing More Than Custom Code Would

90+
Lighthouse score
Mobile, production builds
4-12 weeks
Typical timeline
Scope-dependent
$25K-$200K
Project range
MVP to enterprise platform
5,000+
Projects shipped
Since 2012
What Custom Software Actually Delivers — And What Off-the-Shelf Never Will

Your team opens a SaaS dashboard and immediately starts building workarounds — spreadsheets, Zapier chains, manual data exports — because the tool covers 60% of your workflow and breaks the rest. Custom software development means we write the exact application your business needs, not a feature checklist built for someone else's use case. We build on Next.js 14 with App Router, Supabase for Postgres and row-level security, and Vercel's edge network. That stack gives your team server-side rendering, real-time WebSocket subscriptions, instant rollbacks, and sub-200ms TTFB without managing a single EC2 instance. You get a dedicated senior engineer — not a rotating bench of juniors — who scopes a fixed-price contract before touching your repo. The output is a production application with CI/CD on GitHub Actions, Playwright E2E tests, and documentation your engineers can actually maintain. You own everything: the codebase, the Supabase project, the Vercel account. No license fees, no vendor lock-in, no surprise invoices when your usage spikes.

プロジェクトが失敗する理由

Your offshore team shipped code that scores 40 on Lighthouse and crashes under real traffic. Every month of poor performance costs you 7% conversion rate per second of load time.
You're paying $3K/month for a SaaS tool that covers 60% of your workflow and breaks the rest. Your team builds workarounds that become tech debt — compounding costs quarter over quarter.
Your current vendor disappeared mid-project and left undocumented spaghetti code. Rewriting from scratch costs 2-3x what finishing correctly would have cost.
You need real-time features but your monolith can't support WebSocket connections at scale. Competitors with live data views are closing deals you're losing to stale dashboards.
Your internal tool runs on a five-year-old React app with no tests and no deploy pipeline. One bad merge takes down the tool your entire engineering org depends on daily.
Security review flagged your app for missing row-level access control and unencrypted PII. A single data breach costs mid-market companies an average of $3.86M according to IBM's 2024 report.

構築する内容

Stop paying $3K/month for SaaS tools that force your team into daily workarounds

Ship server components, parallel routes, and streaming SSR — fast loads without client-side rendering bloat

Fire the offshore vendor who shipped a 40-Lighthouse app that crashes under real traffic

Deploy OAuth, magic links, and Postgres with row-level security policies enforced at the database layer

Replace the five-year-old internal tool with no tests and no deploy pipeline

Get preview deployments on every PR, instant rollbacks, and edge functions in 30+ regions

Fix the monolith that can't support WebSocket connections for real-time features

Add live dashboards, notifications, and collaborative features with Supabase Realtime over WebSockets

Eliminate undocumented spaghetti code left behind by a disappeared contractor

Run Playwright E2E tests, TypeScript strict checks, and Lighthouse CI on every push — broken builds never ship

Pass security review after flagged missing row-level policies and unencrypted PII

Own your repo, Supabase project, and Vercel account with full migration docs and deployment steps

私たちのプロセス

01

Scope and Architecture

We audit your requirements, map data models in Supabase, define API routes, and deliver a fixed-price proposal with wireframes.
Week 1
02

Foundation Sprint

We scaffold the Next.js project, configure Supabase auth and RLS policies, set up Vercel environments, and wire CI/CD.
Week 2-3
03

Feature Build

Core features ship in two-week sprints with preview deployments you can test after every merge.
Week 4-8
04

QA and Performance

Playwright E2E tests, Lighthouse audits, load testing with k6, and security review against OWASP Top 10.
Week 9-10
05

Launch and Handoff

We deploy to production, run a 48-hour burn-in, hand over documentation, and start a 30-day warranty period.
Week 11-12

よくある質問

How much does custom software development actually cost?

Most of our projects land between $25K and $200K. A focused internal tool or MVP with auth, a few core views, and a Supabase backend typically runs $25K-$60K. A multi-role platform with real-time features, third-party integrations, and admin dashboards sits in the $80K-$150K range. Enterprise builds with compliance requirements, SSO, and complex data pipelines can push past $150K. We scope fixed-price contracts after a paid discovery week, so you'll know the exact number before we start building.

Why Next.js + Supabase instead of a traditional backend?

Next.js gives you server-side rendering, API routes, and React in one framework — no separate frontend and backend repos. Supabase replaces a custom backend with managed Postgres, built-in auth, real-time subscriptions, and row-level security. Vercel deploys everything to the edge with zero DevOps. The result: fewer moving parts, faster iteration, and lower hosting costs. A typical Supabase Pro plan runs $25/month compared to $200-$500/month for equivalent AWS infrastructure. You're not giving up control — you own the Postgres database and can migrate it anywhere.

How long does a typical project take from start to launch?

Four to twelve weeks depending on scope. A focused MVP with three to five core features ships in four to six weeks. A full platform with real-time data, role-based access, and third-party integrations takes eight to twelve weeks. We don't pad timelines — our process steps are fixed, and we ship preview deployments every week so you're never guessing where things stand.

What does the project team look like?

You'll work with a senior engineer who owns the codebase and a project lead who manages scope and communication. For larger builds, we add a second engineer or a dedicated QA specialist. We don't staff projects with juniors and charge senior rates. Your Slack channel connects directly to the people writing your code — no account managers relaying messages.

Do we own the code and infrastructure after launch?

Yes, completely. The GitHub repo lives in your org. The Supabase project is on your account. The Vercel deployment is under your team. We transfer everything during handoff, including environment variables, migration files, and runbooks. There are no license fees, no proprietary frameworks, and no contractual lock-in. If you want to bring maintenance in-house or hire another agency later, you can — the codebase is standard Next.js and TypeScript.

What if the project scope changes mid-build?

Scope changes happen. We handle them with change orders — a one-page document that describes the new work, the cost delta, and the timeline impact. You approve it before we write any code. Most projects see one or two small change orders. We build the architecture to accommodate growth, so adding a new feature after launch doesn't mean rewriting the foundation.

What performance guarantees do you offer?

We guarantee 90+ Lighthouse performance scores on mobile at launch. It's written into the contract. If we miss it, we fix it at no extra cost during the 30-day warranty period. We also target sub-200ms Time to First Byte on Vercel's edge network and run load tests with k6 to verify the app handles your expected traffic before go-live.

How do you handle security and data compliance?

Supabase row-level security policies enforce access control at the database layer — not just in the UI. We configure HTTPS everywhere, set proper CORS headers, sanitize inputs, and review against OWASP Top 10 before launch. For teams that need SOC 2 or HIPAA alignment, we scope additional controls like audit logging, encryption at rest, and access reviews. Supabase runs on AWS with SOC 2 Type II certification, which gives you a strong infrastructure baseline.

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