diff --git a/.eslintrc.cjs b/.eslintrc.cjs
index 979b6cd..5158214 100644
--- a/.eslintrc.cjs
+++ b/.eslintrc.cjs
@@ -5,12 +5,19 @@ module.exports = {
   },
   extends: ['plugin:react/recommended', 'standard-with-typescript', 'prettier'],
   overrides: [],
+  parser: '@typescript-eslint/parser',
   parserOptions: {
     ecmaVersion: 'latest',
     project: './tsconfig.json',
     sourceType: 'module',
   },
-  plugins: ['react', 'prettier', 'sort-keys-fix', 'better-styled-components'],
+  plugins: [
+    'better-styled-components',
+    'prettier',
+    'react',
+    'sort-keys-fix',
+    'typescript-sort-keys',
+  ],
   rules: {
     '@typescript-eslint/strict-boolean-expressions': 'off',
     '@typescript-eslint/triple-slash-reference': 'off',
@@ -52,5 +59,7 @@ module.exports = {
       },
     ],
     'sort-keys-fix/sort-keys-fix': 'error',
+    'typescript-sort-keys/interface': 'error',
+    'typescript-sort-keys/string-enum': 'error',
   },
 };
diff --git a/package.json b/package.json
index 6843282..0970511 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,8 @@
     "zod": "^3.21.4"
   },
   "devDependencies": {
-    "eslint": "^8.0.1",
+    "@typescript-eslint/parser": "^5.61.0",
+    "eslint": "^8.44.0",
     "eslint-config-prettier": "^8.8.0",
     "eslint-config-standard-with-typescript": "^34.0.1",
     "eslint-plugin-better-styled-components": "^1.1.2",
@@ -32,6 +33,7 @@
     "eslint-plugin-promise": "^6.0.0",
     "eslint-plugin-react": "^7.32.2",
     "eslint-plugin-sort-keys-fix": "^1.1.2",
+    "eslint-plugin-typescript-sort-keys": "^2.3.0",
     "husky": "^8.0.3",
     "lerna": "^7.1.1",
     "lint-staged": "^13.2.0",
diff --git a/packages/server/schemas/currency.ts b/packages/server/schemas/currency.ts
new file mode 100644
index 0000000..f865921
--- /dev/null
+++ b/packages/server/schemas/currency.ts
@@ -0,0 +1,13 @@
+import { z } from 'zod';
+import { Schema, model } from 'mongoose';
+import { type CurrencyType } from '../types';
+
+export const CurrencySchema = z.object({
+  label: z.string(),
+} satisfies CurrencyType);
+
+const schema = new Schema({
+  label: { required: true, type: String },
+} satisfies CurrencyType);
+
+export const Currency = model('Currency', schema);
diff --git a/packages/server/schemas/index.ts b/packages/server/schemas/index.ts
index e5abc85..5e4ea02 100644
--- a/packages/server/schemas/index.ts
+++ b/packages/server/schemas/index.ts
@@ -1 +1,4 @@
 export * from './user';
+export * from './spending';
+export * from './spendingCategory';
+export * from './currency';
diff --git a/packages/server/schemas/spending.ts b/packages/server/schemas/spending.ts
new file mode 100644
index 0000000..c2c856b
--- /dev/null
+++ b/packages/server/schemas/spending.ts
@@ -0,0 +1,21 @@
+import { z } from 'zod';
+import { Schema, model } from 'mongoose';
+import { type SpendingType } from '../types/spending';
+
+export const SpendingSchema = z.object({
+  amount: z.number(),
+  currencyId: z.string(),
+  date: z.date(),
+  spendingCategoryId: z.string(),
+  userId: z.string(),
+} satisfies SpendingType);
+
+const schema = new Schema({
+  amount: { required: true, type: Number },
+  currencyId: { required: true, type: String },
+  date: { required: true, type: Date },
+  spendingCategoryId: { required: true, type: String },
+  userId: { required: true, type: String },
+} satisfies SpendingType);
+
+export const Spending = model('Spending', schema);
diff --git a/packages/server/schemas/spendingCategory.ts b/packages/server/schemas/spendingCategory.ts
new file mode 100644
index 0000000..c61c8ec
--- /dev/null
+++ b/packages/server/schemas/spendingCategory.ts
@@ -0,0 +1,17 @@
+import { z } from 'zod';
+import { Schema, model } from 'mongoose';
+import { type SpendingCategoryType } from '../types';
+
+export const SpendingCategorySchema = z.object({
+  backgroundColor: z.string(),
+  label: z.string(),
+  userId: z.string(),
+} satisfies SpendingCategoryType);
+
+const schema = new Schema({
+  backgroundColor: { required: true, type: String },
+  label: { required: true, type: String },
+  userId: { required: true, type: String },
+} satisfies SpendingCategoryType);
+
+export const SpendingCategory = model('SpendingCategory', schema);
diff --git a/packages/server/types/currency.ts b/packages/server/types/currency.ts
new file mode 100644
index 0000000..2a7b2bc
--- /dev/null
+++ b/packages/server/types/currency.ts
@@ -0,0 +1,5 @@
+import { type StringInput } from './primitives';
+
+export interface CurrencyType {
+  label: StringInput;
+}
diff --git a/packages/server/types/index.ts b/packages/server/types/index.ts
index e5abc85..5e4ea02 100644
--- a/packages/server/types/index.ts
+++ b/packages/server/types/index.ts
@@ -1 +1,4 @@
 export * from './user';
+export * from './spending';
+export * from './spendingCategory';
+export * from './currency';
diff --git a/packages/server/types/primitives.ts b/packages/server/types/primitives.ts
index 2535f30..7f2dece 100644
--- a/packages/server/types/primitives.ts
+++ b/packages/server/types/primitives.ts
@@ -1,3 +1,5 @@
 import { type z } from 'zod';
 
-export type StringInput = string | z.ZodString | { type: StringConstructor; [key: string]: any };
+export type StringInput = string | z.ZodString | { [key: string]: any; type: StringConstructor };
+export type NumberInput = number | z.ZodNumber | { [key: string]: any; type: NumberConstructor };
+export type DateInput = Date | z.ZodDate | { [key: string]: any; type: DateConstructor };
diff --git a/packages/server/types/spending.ts b/packages/server/types/spending.ts
new file mode 100644
index 0000000..d9f78dd
--- /dev/null
+++ b/packages/server/types/spending.ts
@@ -0,0 +1,9 @@
+import { type StringInput, type DateInput, type NumberInput } from './primitives';
+
+export interface SpendingType {
+  amount: NumberInput;
+  currencyId: StringInput;
+  date: DateInput;
+  spendingCategoryId: StringInput;
+  userId: StringInput;
+}
diff --git a/packages/server/types/spendingCategory.ts b/packages/server/types/spendingCategory.ts
new file mode 100644
index 0000000..75f1859
--- /dev/null
+++ b/packages/server/types/spendingCategory.ts
@@ -0,0 +1,7 @@
+import { type StringInput } from './primitives';
+
+export interface SpendingCategoryType {
+  backgroundColor: StringInput;
+  label: StringInput;
+  userId: StringInput;
+}