FIXED SCOPEone-off build
Ship a typed product, end-to-end.
A defined product, a fixed price, a senior-only team. From RFC to launch in 8–14 weeks.
$15k–$30k
FIXED SCOPE
- Senior engineers only
- Fixed quote in week 1
- Code, infra, runbook — yours
TypeScript that catches the bug before your user does.
We don't add TypeScript as an afterthought. Ten years of strict TypeScript in production — API contracts that don't drift, refactors that land in hours not weeks, codebases where a new engineer is productive on day two instead of month two. The compiler doing the boring half of code review is not a nice-to-have. It's the whole point.
- Strict mode
- Zero runtime surprises
- Typed end-to-end
- Zod-validated boundaries
Why Entalogics for TypeScript
Four things every
TypeScript
codebase actually needs.
Most teams turn on TypeScript and keep writing JavaScript with type annotations. That's not TypeScript — that's any with extra steps. We bring the discipline that makes the compiler your best engineer, not your most ignored one.
Performance01
A compiler that earns its build time.
TypeScript's value is proportional to how strictly you use it. Strict mode, noUncheckedIndexedAccess, exactOptionalPropertyTypes — the flags most teams quietly disable. We enable them from day one and let the compiler surface the bugs before they reach production.
Architecture02
One source of truth from database to UI.
Schema drift is how bugs sneak in — the API returns a string, the frontend expects a number, nobody notices until a customer calls. We pull a single source of truth: Drizzle or Prisma generates the DB types, Zod owns the API boundary, and tRPC or generated GraphQL types carry that contract to the UI. No manual syncing. No surprises.
State03
Typed state that can't lie to you.
Discriminated unions over boolean flags. Result types over thrown exceptions. State machines over isLoading && !isError && data !== null. TypeScript's type system is strong enough to make illegal states unrepresentable — most codebases leave that power entirely on the table.
Refactorability04
A codebase where rename actually works.
The real test of TypeScript is what happens eighteen months in when a product requirement changes a core type. If tsc --noEmit catches every downstream break in five seconds, you're doing it right. If your team is afraid to rename a field, you're not using TypeScript — you're using a typing system held together with as casts.
When TypeScript, when not
TypeScript is a tool.
Not a religion.
An honest decision matrix. We'll tell you on the first call whether stricter TypeScript is your actual problem — or whether something else is blocking your team.
USE STRICT TYPESCRIPT WHEN
- You have more than three engineers writing against the same codebase
- The domain is complex — finance, healthcare, logistics — where a wrong type is a wrong transaction
- You expect long-lived code with multiple contributors over multiple years
- Refactors happen regularly and manual regression testing is too slow to be reliable
CONSIDER LOOSENING WHEN
- Rapid prototype where throwing it away is the plan — type everything after you've validated the idea
- A build script or CLI tool that runs once and is read by one person — JSDoc comments may be enough
- Greenfield with a solo founder and a 4-week runway — ship first, type it when the shape stabilises
WE SAY NO WHEN
- "We want to add TypeScript to our existing JavaScript codebase over the weekend." Migration done right takes weeks, not a sprint.
- "We already have TypeScript but we use any everywhere." That's not a TypeScript project — that's a migration project.
- "Type it after we launch." We've seen how that ends. The launch never slows down enough to go back.
What we build with TypeScript
Six product surfaces.
One quality bar.
The shapes of TypeScript work we ship most often. Each integrates cleanly with your existing stack if you already have one.
- S01
Full-stack SaaS products
Full-stack SaaS productsEnd-to-end type safety from Drizzle schema to Next.js App Router. One contract. No API drift. No runtime surprises on the happy path or the error path.
NEXT.JSTRPCDRIZZLEZOD - S02
TypeScript API services
TypeScript API servicesHono or Fastify with typed request/response contracts, Zod middleware validation, and generated OpenAPI docs as a byproduct — not a separate document nobody keeps up to date.
HONOFASTIFYZODOPENAPI-TS - S03
Shared type libraries & monorepos
Shared type libraries & monoreposA shared @company/types package that every frontend and backend team imports from. Turborepo or Nx. One place where the schema lives. Consumers get type errors — not runtime surprises in production.
TURBOREPONXTSXCHANGESETS - S04
TypeScript migrations
TypeScript migrationsJavaScript to TypeScript, any-ridden TypeScript to strict TypeScript. File by file, no flag-day. The team keeps shipping while we tighten the types underneath them.
TYPESCRIPTTS-MIGRATEJSCODESHIFTZOD - S05
Internal tooling & CLIs
Internal tooling & CLIsTyped Node.js scripts, internal CLIs, data pipelines. The tooling that runs your business but nobody ever allocated time to do properly.
NODE.JSCOMMANDERZODVITEST - S06
Design system type contracts
Design system type contractsComponent prop types that encode design decisions — not just string. Variant maps, token types, polymorphic component generics. Props that make wrong usage a compile error.
STORYBOOKCVARADIXTOKENS-STUDIO
The playbook
Patterns we
ship on repeat.
The TypeScript patterns that show up on almost every engagement. Not invention — convention, applied with precision.
P01
Strict mode from day one
strict: true plus the flags most teams skip. The short-term pain of fixing the compiler's complaints is smaller than the long-term pain of a codebase where any is load-bearing.
P02
Zod at every boundary
Runtime validation where untrusted data enters — API responses, form inputs, environment variables, query parameters. Zod schemas become the types. No manual syncing. No drift between what you expect and what you get.
P03
Discriminated unions over boolean flags
{ status: 'loading' } | { status: 'error'; error: Error } | { status: 'success'; data: T } instead of isLoading, isError, and data all independently nullable. Illegal states become unrepresentable at the type level.
P04
End-to-end typed contracts
tRPC for full-stack TypeScript. Generated types from GraphQL or OpenAPI when crossing a third-party boundary. The API contract is checked at compile time, not discovered at runtime by a user on a Tuesday.
P05
Typed tests
Vitest with strict type assertions. No as any in test setup. If the test can't be written without casting, the type design has a problem — and we'd rather find it in the test than in production.
P06
Incremental migration
allowJs: true, checkJs: true, file-by-file strict adoption. The TypeScript compiler is surprisingly good at migrating large JavaScript codebases without a rewrite. We've done this enough to know where the shortcuts that don't work are.
Signature case
A fintech platform,
migrated from any-first to strict TypeScript..
A B2B payments platform with 120,000 lines of TypeScript — technically. In practice: any cast at every API boundary, no runtime validation, three separate type definitions for Transaction that had quietly diverged. A data bug was causing incorrect invoice amounts for 2% of transactions and nobody could trace it because the types were lying. We audited, consolidated, and enforced strict types across the stack in 8 weeks. Without a feature freeze.
Before
847 any casts · 3 conflicting Transaction types · 0 API boundary validation · 2% invoice error rate
After
0 any in product code · single TransactionSchema (Zod) · full API validation · invoice errors resolved
- any eliminated−100%
- Type-related bugs (90d)−94%
- to fully strict8wk
- shipped regressions0
Engagement shape
Eight to ten weeks
to a measurable ship.
A typical TypeScript engagement, end-to-end. We tighten the types incrementally — never flag-day. The current product keeps shipping while we work.
- W01
Audit + RFC
Two senior engineers across the codebase. any inventory, boundary validation gaps, divergent type definitions, compiler flag audit. You leave week one with a ranked RFC and a clear map of where the types are lying to you.
- W02–03
Foundation + first boundary
Strict mode enabled, Zod at the highest-risk API boundary, one core domain type consolidated end-to-end. Real compiler coverage in your CI, not a local demo.
- W04–08
Migrate boundary by boundary
Surface by surface, under feature flags where needed. Old untyped code and new strict code coexist. Your roadmap keeps moving — we don't ask for a freeze to fix your types.
- W09+
Cleanup + handoff
Delete the any scaffolding. Type library documented. Vitest coverage on critical paths. Runbook handed to your team — or we stay on retainer and keep the type safety compounding.
Stack
Tools we
reach for first.
Picked by problem, not by resume. Happy to slot into your stack — but greenfield, this is the default.
- LanguageTypeScript 5.x (strict) · Zod · ts-pattern · Effect
- FrameworkNext.js · Hono · Fastify · tRPC · Remix
- ContractstRPC · Zod · openapi-typescript · GraphQL Code Generator
- TestingVitest · Playwright · ts-jest · React Testing Library
- ToolingTurborepo · tsup · tsx · biome · Changesets
- InfraVercel · Cloudflare Workers · AWS Lambda · Datadog · Sentry
Engagement
Three ways
to work with us.
No hourly retainer that bills for "thinking time." Pick a lane that matches your stage; everything is fixed-quote or transparently rated.
DEDICATED TEAMmonthly
Hire dedicated TypeScript engineers.
Embedded engineers in your Slack, your Linear, your standups. A scaled pod of senior TypeScript engineers, augmenting your team. Pause, resize, end with 30 days' notice.
$5k / eng / mo
PER ENGINEER
- Same senior bar as fixed-scope
- Embedded in your team
- Founder-direct escalation
ENGAGEMENTcustom
Strategic TypeScript partnership.
A long-term partner for product orgs that need both delivery and judgement — type system design, migration program, hiring help.
custom
PROCUREMENT-FRIENDLY
- Multi-quarter roadmap
- Architecture & hiring partner
- Procurement-friendly paper
FAQ
Sharp questions,
straight answers.
Contracts, migrations, strict mode — the questions we get on every TypeScript discovery call.tRPC if your frontend and backend are both TypeScript and live in the same monorepo — the end-to-end type safety is immediate and the DX is hard to beat. REST with generated types (openapi-typescript or GraphQL Code Generator) when you're crossing a team boundary, serving multiple clients, or working with an existing API contract you don't own. The decision is about your team topology, not which one is technically superior.
Yes. We use `allowJs: true` and `checkJs: true` to bring TypeScript into the project without touching existing files. Then we migrate file by file, strictest and highest-risk modules first. The team keeps shipping throughout. A full migration on a large codebase typically takes 8–12 weeks depending on size and how much `any` is load-bearing.
Yes — but the pain is front-loaded, not ongoing. Strict mode surfaces real bugs that loose TypeScript quietly ignores. Teams that enable it from day one rarely notice the cost. Teams that try to add it to an existing loose codebase feel it acutely — because they're paying back accumulated debt. Enable it early or pay interest later.
Yes. The engineers who write the RFC are the engineers who ship the code. No handoff to a junior team mid-engagement. No account manager between you and the people doing the work. Direct access throughout.
Yes. If you're on Zod we'll build on top of it — it's our default anyway. If you're on Yup we'll work within it and flag honestly if there are specific patterns where Zod would meaningfully reduce complexity. We don't ask teams to rewrite working validation to fit our preferences.
Founder-direct
Tell us whatyou're building.
Thirty minutes with the founder. We'll bring a senior TypeScript engineer, the relevant playbook, and a candid read on whether strict types are the actual problem — or a symptom of something upstream.