diff --git a/.github/workflows/open-api-validation.yml b/.github/workflows/open-api-validation.yml
new file mode 100644
index 000000000..80c9ef0a1
--- /dev/null
+++ b/.github/workflows/open-api-validation.yml
@@ -0,0 +1,39 @@
+name: OpenAPI Schema Validation
+
+on:
+  push:
+    paths:
+      - "openapi/**"
+  pull_request:
+    paths:
+      - "openapi/**"
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [18.x]
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Check file extensions
+        run: |
+          shopt -s globstar
+          for file in openapi/*.yaml; do
+            if [[ ! "$file" =~ \.yaml$ ]]; then
+              echo "Error: $file does not have the .yml extension"
+              exit 1
+            fi
+          done
+      - name: Validate OpenAPI files
+        run: |
+          yarn add swagger-cli
+          for file in openapi/*.yaml
+          do
+            echo "Validating $file"
+            yarn swagger-cli validate $file --no-color || exit 1
+          done
\ No newline at end of file
diff --git a/openapi/openapi.yaml b/openapi/openapi.yaml
new file mode 100644
index 000000000..5ece8720f
--- /dev/null
+++ b/openapi/openapi.yaml
@@ -0,0 +1,58 @@
+openapi: 3.1.0
+info:
+  version: 1.0.0
+  title: Deep Learning Playground Backend API
+  contact:
+    email: dlp@datasciencegt.org
+    url: https://github.com/DSGT-DLP/Deep-Learning-Playground
+  license:
+    name: MIT
+    url: https://github.com/DSGT-DLP/Deep-Learning-Playground/blob/nextjs/LICENSE
+  description: >
+    Deep Learning Playground Backend API specifications
+
+tags:
+  - name: dataset
+    description: Everything about dataset
+  - name: s3
+    description: Everything about s3
+  - name: test
+    description: Test API endpoints
+  - name: trainspace
+    description: Everything about trainspace
+servers:
+  - url: http://localhost:8000
+paths:
+  /api/dataset/defaultDataset:
+    $ref: paths/dataset/defaultDataset.yaml
+  /api/dataset/getColumnsFromDatasetFile:
+    $ref: paths/dataset/getColumnsFromDatasetFile.yaml
+  /api/s3/getExecutionsFilesPresignedUrls:
+    $ref: paths/s3/getExecutionsFilesPresignedUrls.yaml
+  /api/s3/getSignedUploadUrl:
+    $ref: paths/s3/getSignedUploadUrl.yaml
+  /api/s3/getUserDatasetFilesData:
+    $ref: paths/s3/getUserDatasetFilesData.yaml
+  /api/test:
+    $ref: paths/test/none.yaml
+  /api/trainspace/create-trainspace:
+    $ref: paths/trainspace/create-trainspace.yaml
+  /api/trainspace/getTrainspaceData:
+    $ref: paths/trainspace/getTrainspaceData.yaml
+# components:
+#   securitySchemes:
+#     main_auth:
+#       type: oauth2
+#       flows:
+#         implicit:
+#           authorizationUrl: http://example.com/api/oauth/dialog
+#           scopes:
+#             read:users: read users info
+#             write:users: modify or remove users
+#     api_key:
+#       type: apiKey
+#       in: header
+#       name: api_key
+#     basic_auth:
+#       type: http
+#       scheme: basic
diff --git a/openapi/paths/dataset/defaultDataset.yaml b/openapi/paths/dataset/defaultDataset.yaml
new file mode 100644
index 000000000..f99b7708a
--- /dev/null
+++ b/openapi/paths/dataset/defaultDataset.yaml
@@ -0,0 +1,42 @@
+post:
+  summary: Default dataset
+  description: Endpoint to get user selected default dataset for training
+  tags:
+    - dataset
+  requestBody:
+    content:
+      application/json:
+        schema:
+          type: object
+          required:
+            - using_default_dataset
+          properties:
+            using_default_dataset:
+              type: string
+              description: dataset selected for training
+          example:
+            using_default_dataset: "IRIS"
+    required: true
+  responses:
+    "200":
+      description: Dataset selected successfully
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              columns:
+                type: array
+                example: [col1, col2, col3]
+    "400":
+      description: Dataset wasn't selected properly. This is usually something wrong with your code
+    "401":
+      description: User is not authenticated
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              error:
+                type: string
+                example: "User is not authenticated"
diff --git a/openapi/paths/dataset/getColumnsFromDatasetFile.yaml b/openapi/paths/dataset/getColumnsFromDatasetFile.yaml
new file mode 100644
index 000000000..336aaa998
--- /dev/null
+++ b/openapi/paths/dataset/getColumnsFromDatasetFile.yaml
@@ -0,0 +1,52 @@
+post:
+  summary: Get columns from dataset file
+  description: "API Endpoint to retrieve columns from a user uploaded dataset file (eg: column names for a CSV file)"
+  tags:
+    - dataset
+  requestBody:
+    content:
+      application/json:
+        schema:
+          type: object
+          required:
+            - uid
+            - data_source
+            - name
+          properties:
+            uid:
+              type: string
+              description: User Id
+            data_source:
+              type: string
+              description: "What type of training was the user running (eg: TABULAR, PRETRAINED, OBJECT_DETECTION, IMAGE, etc)"
+            name:
+              type: string
+              description: Name of dataset file
+          example:
+            uid: "1234"
+            data_source: "TABULAR"
+            name: "data.csv"
+    required: true
+  responses:
+    "200":
+      description: Columns Fetched Successfully
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              columns:
+                type: array
+                example: [col1, col2, col3]
+    "400":
+      description: Dataset columns weren't selected properly. This is usually something wrong with your code
+    "401":
+      description: User is not authenticated
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              error:
+                type: string
+                example: "User is not authenticated"
diff --git a/openapi/paths/s3/getExecutionsFilesPresignedUrls.yaml b/openapi/paths/s3/getExecutionsFilesPresignedUrls.yaml
new file mode 100644
index 000000000..6cddebcf3
--- /dev/null
+++ b/openapi/paths/s3/getExecutionsFilesPresignedUrls.yaml
@@ -0,0 +1,42 @@
+post:
+  summary: Get S3 Presigned URLs for result files
+  description: API Endpoint to use S3 Presigned URLs to retrieve result files from S3 given an execution id
+  tags:
+    - s3
+  requestBody:
+    content:
+      application/json:
+        schema:
+          type: object
+          required:
+            - exec_id
+          properties:
+            exec_id:
+              type: string
+              description: The execution id
+          example:
+            exec_id: "1234"
+    required: true
+  responses:
+    "200":
+      description: Result files for your execution fetched successfully
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              message:
+                type: string
+                example: "Result file fetch successful"
+    "400":
+      description: Result file fetch didn't go through successfully. This is usually something wrong with your code
+    "401":
+      description: User is not authenticated
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              error:
+                type: string
+                example: "User is not authenticated"
diff --git a/openapi/paths/s3/getSignedUploadUrl.yaml b/openapi/paths/s3/getSignedUploadUrl.yaml
new file mode 100644
index 000000000..95d07739c
--- /dev/null
+++ b/openapi/paths/s3/getSignedUploadUrl.yaml
@@ -0,0 +1,52 @@
+post:
+  summary: Get Signed Upload URL
+  description: Endpoint to upload files to S3
+  tags:
+    - s3
+  requestBody:
+    content:
+      application/json:
+        schema:
+          type: object
+          required:
+            - version
+            - filename
+            - file
+          properties:
+            version:
+              type: integer
+              description: The file version
+            filename:
+              type: string
+              description: The name of the file
+            file:
+              type: object
+              description: the file
+          example:
+            version: 2
+            filename: "file"
+            file: { "col1": [val1, val2], "col2": [val3, val4] }
+    required: true
+  responses:
+    "200":
+      description: Data uploaded successfully
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              message:
+                type: string
+                example: "Upload successful"
+    "400":
+      description: Upload didn't go through successfully. This is usually something wrong with your code
+    "401":
+      description: User is not authenticated
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              error:
+                type: string
+                example: "User is not authenticated"
diff --git a/openapi/paths/s3/getUserDatasetFilesData.yaml b/openapi/paths/s3/getUserDatasetFilesData.yaml
new file mode 100644
index 000000000..3581217f0
--- /dev/null
+++ b/openapi/paths/s3/getUserDatasetFilesData.yaml
@@ -0,0 +1,43 @@
+post:
+  summary: Get User Dataset Files
+  description: API Endpoint to retrieve all user dataset files uploaded in S3
+  tags:
+    - s3
+  requestBody:
+    content:
+      application/json:
+        schema:
+          type: object
+          required:
+            - uid
+            - data_source
+          properties:
+            uid:
+              type: string
+              description: User ID
+            data_source:
+              type: string
+              description: "What type of training was the user running (eg: TABULAR, PRETRAINED, OBJECT_DETECTION, IMAGE, etc)"
+  responses:
+    "200":
+      description: User Dataset files for user fetched successfully
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              message:
+                type: string
+                example: "User Dataset file fetch successful"
+    "400":
+      description: User Dataset files for user wasn't fetched successfully. This is usually something wrong with your code
+    "401":
+      description: User is not authenticated
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              error:
+                type: string
+                example: "User is not authenticated"
diff --git a/openapi/paths/test/none.yaml b/openapi/paths/test/none.yaml
new file mode 100644
index 000000000..695d483bc
--- /dev/null
+++ b/openapi/paths/test/none.yaml
@@ -0,0 +1,16 @@
+get:
+  summary: Test Backend alive
+  description: A simple endpoint to test if our backend is alive
+  tags:
+    - test
+  responses:
+    200:
+      description: Test Backend alive
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              Status:
+                type: string
+                example: "Backend is alive"
diff --git a/openapi/paths/trainspace/create-trainspace.yaml b/openapi/paths/trainspace/create-trainspace.yaml
new file mode 100644
index 000000000..0cd402810
--- /dev/null
+++ b/openapi/paths/trainspace/create-trainspace.yaml
@@ -0,0 +1,42 @@
+post:
+  summary: Create Trainspace
+  description: API Endpoint to create a "trainspace". Trainspace is a new concept/data structure we introduce to track user's training requests. Concept similar to execution_id.
+  tags:
+    - trainspace
+  requestBody:
+    content:
+      application/json:
+        schema:
+          type: object
+          required:
+            - uid
+          properties:
+            uid:
+              type: string
+              description: User ID
+          example:
+            uid: "1234"
+    required: true
+  responses:
+    "200":
+      description: Trainspace created successfully
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              message:
+                type: string
+                example: "Trainspace Creation successful"
+    "400":
+      description: Trainspace Creation didn't go through successfully. This is usually something wrong with your code
+    "401":
+      description: User is not authenticated
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              error:
+                type: string
+                example: "User is not authenticated"
diff --git a/openapi/paths/trainspace/getTrainspaceData.yaml b/openapi/paths/trainspace/getTrainspaceData.yaml
new file mode 100644
index 000000000..0911a3a3b
--- /dev/null
+++ b/openapi/paths/trainspace/getTrainspaceData.yaml
@@ -0,0 +1,42 @@
+post:
+  summary: Get Trainspace Data
+  description: API Endpoint to identify all trainspaces for a given user id.
+  tags:
+    - trainspace
+  requestBody:
+    content:
+      application/json:
+        schema:
+          type: object
+          required:
+            - uid
+          properties:
+            uid:
+              type: string
+              description: User ID
+          example:
+            uid: "1234"
+    required: true
+  responses:
+    "200":
+      description: Able to query and retrieve trainspace objects belonging to a user
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              message:
+                type: string
+                example: "Trainspace Retrieval Successful"
+    "400":
+      description: Trainspace Retrieval didn't go through successfully. This is usually something wrong with your code
+    "401":
+      description: User is not authenticated
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              error:
+                type: string
+                example: "User is not authenticated"