diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..00543e5
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+build
+coverage
+node_modules
\ No newline at end of file
diff --git a/jest.config.js b/jest.config.js
new file mode 100644
index 0000000..6b5c06f
--- /dev/null
+++ b/jest.config.js
@@ -0,0 +1,8 @@
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+const moduleNameMapper = require("tsconfig-paths-jest")(tsconfig);
+
+module.exports = {
+  preset: "ts-jest",
+  testEnvironment: "node",
+  moduleNameMapper
+};
diff --git a/nodemon.json b/nodemon.json
new file mode 100644
index 0000000..7dd9e28
--- /dev/null
+++ b/nodemon.json
@@ -0,0 +1,5 @@
+{
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+  "ignore": ["src/**/*.test.ts"],
+  "exec": "ts-node -r tsconfig-paths/register"
+}
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..ac4ba71
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,6663 @@
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diff --git a/package.json b/package.json
new file mode 100644
index 0000000..c24e2e3
--- /dev/null
+++ b/package.json
@@ -0,0 +1,44 @@
+{
+  "name": "y",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "dependencies": {
+    "koa": "^2.7.0",
+    "koa-helmet": "^4.1.0",
+    "koa-pino-logger": "^2.1.3",
+    "koa-router": "^7.4.0",
+    "pino": "^5.12.4",
+    "tsconfig-paths": "^3.8.0"
+  },
+  "devDependencies": {
+    "@shopify/jest-koa-mocks": "^2.1.3",
+    "@types/jest": "^24.0.13",
+    "@types/koa": "^2.0.48",
+    "@types/koa-helmet": "^3.1.2",
+    "@types/koa-pino-logger": "^2.1.4",
+    "@types/koa-router": "^7.0.40",
+    "@types/node": "^12.0.2",
+    "@types/pino": "^5.8.7",
+    "@types/supertest": "^2.0.7",
+    "jest": "^24.8.0",
+    "nodemon": "^1.19.0",
+    "pino-pretty": "^3.0.0",
+    "supertest": "^4.0.2",
+    "ts-jest": "^24.0.2",
+    "ts-mockito": "^2.3.1",
+    "ts-node": "^8.1.0",
+    "tsconfig-paths-jest": "0.0.1",
+    "typescript": "^3.4.5"
+  },
+  "scripts": {
+    "dev": "nodemon src/index.ts | pino-pretty",
+    "test": "NODE_ENV=TEST jest",
+    "start": "NODE_ENV=production node -r tsconfig-paths/register build/index.js",
+    "prebuild": "npm run clean",
+    "build": "tsc",
+    "clean": "rm -rf build/"
+  },
+  "author": "",
+  "license": "ISC"
+}
diff --git a/src/app.ts b/src/app.ts
new file mode 100644
index 0000000..99eda6f
--- /dev/null
+++ b/src/app.ts
@@ -0,0 +1,21 @@
+import pino from "koa-pino-logger";
+import helmet from "koa-helmet";
+import { Dependencies } from "@/models";
+import router from "@/router";
+import errors from "@/middleware/errors";
+import Logger from "@/services/Logger";
+import Koa from "koa";
+import { App } from "@/models";
+
+export const createApp = (deps: Dependencies) => {
+  const app: App = new Koa();
+  // set dependencies
+  app.context.di = deps;
+
+  // add middleware
+  return app
+    .use(helmet())
+    .use(errors)
+    .use(pino({ logger: Logger }))
+    .use(router.routes());
+};
diff --git a/src/index.ts b/src/index.ts
new file mode 100644
index 0000000..0e3c2a6
--- /dev/null
+++ b/src/index.ts
@@ -0,0 +1,7 @@
+import { createApp } from "@/app";
+import { Dependencies } from "@/models";
+import { Users, Email, Logger } from "@/services";
+
+createApp(new Dependencies(new Users(), new Email(), Logger)).listen(3000, () =>
+  Logger.info("server started http://localhost:3000/")
+);
diff --git a/src/koa.ts b/src/koa.ts
new file mode 100644
index 0000000..49743c2
--- /dev/null
+++ b/src/koa.ts
@@ -0,0 +1,4 @@
+import KoaRouter from "koa-router";
+import { Router } from "@/models";
+
+export const router: Router = new KoaRouter();
diff --git a/src/lib/env.ts b/src/lib/env.ts
new file mode 100644
index 0000000..f5bb30a
--- /dev/null
+++ b/src/lib/env.ts
@@ -0,0 +1,5 @@
+export const { NODE_ENV: env } = process.env;
+
+export const isDev = () => env === "development";
+export const isProd = () => env === "production";
+export const isTest = () => env === "TEST";
diff --git a/src/middleware/branch.ts b/src/middleware/branch.ts
new file mode 100644
index 0000000..b0a5e50
--- /dev/null
+++ b/src/middleware/branch.ts
@@ -0,0 +1,19 @@
+import { Middleware, Context } from "@/models";
+
+export interface Condition {
+  (ctx: Context): boolean;
+}
+
+export default function(condition: Condition) {
+  return (middleware: Middleware): Middleware => {
+    const mw: Middleware = async (ctx, next) => {
+      if (condition(ctx)) {
+        await middleware(ctx, next);
+      } else {
+        await next();
+      }
+    };
+
+    return mw;
+  };
+}
diff --git a/src/middleware/errors.ts b/src/middleware/errors.ts
new file mode 100644
index 0000000..518d779
--- /dev/null
+++ b/src/middleware/errors.ts
@@ -0,0 +1,18 @@
+import { Middleware } from "@/models";
+
+export const errors: Middleware = async (ctx, next) => {
+  try {
+    await next();
+  } catch (err) {
+    ctx.status = err.status || 500;
+    ctx.type = "json";
+    ctx.body = { status: err.status, message: err.message, state: ctx.state };
+
+    // since we handled this manually we'll
+    // want to delegate to the regular app
+    // level error handling as well so that
+    // centralized still functions correctly.
+    // ctx.app.emit("error", err, ctx);
+  }
+};
+export default errors;
diff --git a/src/middleware/safe.ts b/src/middleware/safe.ts
new file mode 100644
index 0000000..c258b0d
--- /dev/null
+++ b/src/middleware/safe.ts
@@ -0,0 +1,23 @@
+import { Middleware } from "@/models";
+
+export interface Condition {
+  (err: Error): boolean;
+}
+
+export default function(condition: Condition) {
+  return (middleware: Middleware): Middleware => {
+    const mw: Middleware = async (ctx, next) => {
+      try {
+        await middleware(ctx, next);
+      } catch (err) {
+        if (condition(err)) {
+          await next();
+        } else {
+          throw err;
+        }
+      }
+    };
+
+    return mw;
+  };
+}
diff --git a/src/models.ts b/src/models.ts
new file mode 100644
index 0000000..44503f7
--- /dev/null
+++ b/src/models.ts
@@ -0,0 +1,22 @@
+import Koa from "koa";
+import KoaRouter from "koa-router";
+import { Logger } from "pino";
+import { Users, IUser, Email, IEmail } from "@/services";
+
+export interface State {
+  email: IEmail;
+  account: IUser;
+}
+
+export class Dependencies {
+  constructor(public users: Users, public email: Email, public log: Logger) {}
+}
+
+export interface Context {
+  di: Dependencies;
+  state: State;
+}
+
+export interface App extends Koa<State, Context> {}
+export interface Router extends KoaRouter<State, Context> {}
+export interface Middleware extends Koa.Middleware<State, Context> {}
diff --git a/src/router/index.ts b/src/router/index.ts
new file mode 100644
index 0000000..499bbee
--- /dev/null
+++ b/src/router/index.ts
@@ -0,0 +1,4 @@
+import { router } from "@/koa";
+import reopen from "./reopen";
+
+export default router.get("/reopen/:id", ...reopen);
diff --git a/src/router/reopen/getAccountByEmail.ts b/src/router/reopen/getAccountByEmail.ts
new file mode 100644
index 0000000..f118c3b
--- /dev/null
+++ b/src/router/reopen/getAccountByEmail.ts
@@ -0,0 +1,10 @@
+import { Middleware } from "@/models";
+
+const user: Middleware = async (ctx, next) => {
+  ctx.di.log.info(`finding user by email: #${ctx.params.id}`);
+  ctx.state.account = await ctx.di.users.email(ctx.params.id);
+
+  await next();
+};
+
+export default user;
diff --git a/src/router/reopen/getAccountById.ts b/src/router/reopen/getAccountById.ts
new file mode 100644
index 0000000..9121726
--- /dev/null
+++ b/src/router/reopen/getAccountById.ts
@@ -0,0 +1,14 @@
+import { Middleware } from "@/models";
+
+const user: Middleware = async (ctx, next) => {
+  try {
+    ctx.di.log.info(`finding user by id: #${ctx.params.id}`);
+    ctx.state.account = await ctx.di.users.id(Number(ctx.params.id));
+  } catch (err) {
+    ctx.di.log.error(err.message);
+  }
+
+  await next();
+};
+
+export default user;
diff --git a/src/router/reopen/index.test.ts b/src/router/reopen/index.test.ts
new file mode 100644
index 0000000..229b161
--- /dev/null
+++ b/src/router/reopen/index.test.ts
@@ -0,0 +1,17 @@
+import request from "supertest";
+import { createApp } from "@/app";
+import { Users, Email, Logger } from "@/services";
+import { Dependencies } from "@/models";
+
+const deps = new Dependencies(new Users(), new Email(), Logger);
+
+describe("/reopen", () => {
+  it("should reopen an given account", async () => {
+    const app = createApp(deps);
+
+    await request(app)
+      .get("/reopen/1")
+      .expect(res => expect(res.text).toMatchSnapshot())
+      .expect(200);
+  });
+});
diff --git a/src/router/reopen/index.ts b/src/router/reopen/index.ts
new file mode 100644
index 0000000..3e0849d
--- /dev/null
+++ b/src/router/reopen/index.ts
@@ -0,0 +1,16 @@
+import branch from "@/middleware/branch";
+import getAccountById from "./getAccountById";
+import getAccountByEmail from "./getAccountByEmail";
+import unlockAccount from "./unlockAccount";
+import sendEmail from "./sendEmail";
+import sendResponse from "./sendResponse";
+
+const accountNotFound = branch(ctx => !ctx.state.account);
+
+export default [
+  getAccountById,
+  accountNotFound(getAccountByEmail),
+  unlockAccount,
+  sendEmail,
+  sendResponse
+];
diff --git a/src/router/reopen/sendEmail.ts b/src/router/reopen/sendEmail.ts
new file mode 100644
index 0000000..708fddc
--- /dev/null
+++ b/src/router/reopen/sendEmail.ts
@@ -0,0 +1,9 @@
+import { Middleware } from "@/models";
+
+const email: Middleware = async (ctx, next) => {
+  const email = await ctx.di.email.send(ctx.state.account.email);
+  ctx.state.email = email;
+  await next();
+};
+
+export default email;
diff --git a/src/router/reopen/sendResponse.ts b/src/router/reopen/sendResponse.ts
new file mode 100644
index 0000000..4a68190
--- /dev/null
+++ b/src/router/reopen/sendResponse.ts
@@ -0,0 +1,9 @@
+import { Middleware } from "@/models";
+
+const send: Middleware = async (ctx, next) => {
+  ctx.body = { message: "response sent", state: ctx.state };
+
+  await next();
+};
+
+export default send;
diff --git a/src/router/reopen/unlockAccount.ts b/src/router/reopen/unlockAccount.ts
new file mode 100644
index 0000000..2d630a8
--- /dev/null
+++ b/src/router/reopen/unlockAccount.ts
@@ -0,0 +1,14 @@
+import { Middleware } from "@/models";
+
+const user: Middleware = async (ctx, next) => {
+  try {
+    ctx.di.log.info(`unlocking user account: #${ctx.state.account.id}`);
+    ctx.state.account = await ctx.di.users.unlock(Number(ctx.params.id));
+
+    await next();
+  } catch (err) {
+    ctx.throw(401, { message: "Unable to unlock the account" });
+  }
+};
+
+export default user;
diff --git a/src/services/Email.ts b/src/services/Email.ts
new file mode 100644
index 0000000..44ac8cb
--- /dev/null
+++ b/src/services/Email.ts
@@ -0,0 +1,11 @@
+export type IEmail = {
+  id: number;
+  to: string;
+  sent: boolean;
+};
+
+export class Email {
+  send(name: string): Promise<IEmail> {
+    return Promise.resolve({ id: 1, to: name, sent: true });
+  }
+}
diff --git a/src/services/Logger.ts b/src/services/Logger.ts
new file mode 100644
index 0000000..709f6fe
--- /dev/null
+++ b/src/services/Logger.ts
@@ -0,0 +1,10 @@
+import pino, { LoggerOptions } from "pino";
+import { isTest } from "@/lib/env";
+
+export const Logger = pino({
+  name: "csa",
+  enabled: !isTest(),
+  level: "info"
+});
+
+export default Logger;
diff --git a/src/services/Users.ts b/src/services/Users.ts
new file mode 100644
index 0000000..c2b77b6
--- /dev/null
+++ b/src/services/Users.ts
@@ -0,0 +1,19 @@
+export type IUser = {
+  id: number;
+  email: string;
+  locked: boolean;
+};
+
+export class Users {
+  id(id: number): Promise<IUser> {
+    return Promise.resolve({ id, email: "me@app.io", locked: true });
+  }
+
+  email(email: string): Promise<IUser> {
+    return Promise.resolve({ id: 1, email, locked: true });
+  }
+
+  unlock(id: number): Promise<IUser> {
+    return Promise.resolve({ id, email: "me@app.io", locked: false });
+  }
+}
diff --git a/src/services/index.ts b/src/services/index.ts
new file mode 100644
index 0000000..74f8673
--- /dev/null
+++ b/src/services/index.ts
@@ -0,0 +1,3 @@
+export * from "./Users";
+export * from "./Email";
+export * from "./Logger";
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..82badb4
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,18 @@
+{
+  "compilerOptions": {
+    "strict": true,
+    "allowSyntheticDefaultImports": true,
+    "esModuleInterop": true,
+    "module": "commonjs",
+    "target": "es5",
+    "outDir": "build",
+    "sourceMap": false,
+    "types": ["jest"],
+    "typeRoots": ["./node_modules/@types", "./typings"],
+    "baseUrl": ".",
+    "paths": {
+      "@/*": ["src/*"]
+    }
+  },
+  "include": ["typings/**/*.d.ts", "src/**/*.ts"]
+}
diff --git a/typings/index.d.ts b/typings/index.d.ts
new file mode 100644
index 0000000..e69de29