diff --git a/.github/ci-config.ts b/.github/ci-config.ts
new file mode 100644
index 0000000..92efcc3
--- /dev/null
+++ b/.github/ci-config.ts
@@ -0,0 +1,15 @@
+import type { Config } from "drizzle-kit";
+import dotenv from "dotenv";
+
+dotenv.config();
+
+export default {
+  schema: "./db/schema.ts",
+  out: "./db/migrations",
+  dialect: "sqlite",
+  driver: "better-sqlite",
+  dbCredentials: {
+    url: process.env.DATABASE_URL,
+  },
+  verbose: true,
+} as Config;
diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
new file mode 100644
index 0000000..dbe15a5
--- /dev/null
+++ b/.github/workflows/workflow.yml
@@ -0,0 +1,22 @@
+name: CI
+'on':
+  - push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Install modules
+      run: |
+        npm install
+        npm install dotenv-cli
+    - name: Run Prettier
+      run: |
+        npm run check
+    - name: Set up db
+      run: |
+        echo -e 'PORT=3000\nDATABASE_URL="./db/test.db"' > .env.test
+        npx dotenv -e .env.test -- drizzle-kit push --config=.github/ci-config.ts
+    - name: Run tests
+      run: |
+        npm run test
\ No newline at end of file
diff --git a/README.md b/README.md
index a8b2bb1..c211bd4 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,7 @@ npm install
 npm install -g dotenv-cli
 ```
 
-5. Add a `.env` and `.env.test` file it your root with the following configurations:
+5. Add a `.env` and `.env.test` file in your root with the following configurations:
 
 ```bash
 PORT=3000
diff --git a/app/challenges-platform/models/Challenge.ts b/app/challenges-platform/models/Challenge.ts
index 10c1237..4c98011 100644
--- a/app/challenges-platform/models/Challenge.ts
+++ b/app/challenges-platform/models/Challenge.ts
@@ -8,6 +8,7 @@ export enum Evaluation {
   MANUAL,
   AUTOMATIC,
 }
+
 export class Challenge {
   id: number;
   uuid: string;
@@ -16,6 +17,7 @@ export class Challenge {
   format: Format;
   evaluation: Evaluation;
   points: number;
+  deleted: boolean;
 
   constructor({
     id,
@@ -25,6 +27,7 @@ export class Challenge {
     format,
     evaluation,
     points,
+    deleted,
   }: {
     id: number;
     uuid: string;
@@ -33,6 +36,7 @@ export class Challenge {
     format: Format;
     evaluation: Evaluation;
     points: number;
+    deleted: boolean;
   }) {
     this.id = id;
     this.uuid = uuid;
@@ -41,5 +45,6 @@ export class Challenge {
     this.format = format;
     this.evaluation = evaluation;
     this.points = points;
+    this.deleted = deleted;
   }
 }
diff --git a/app/challenges-platform/models/Transformer.ts b/app/challenges-platform/models/Transformer.ts
index 800533d..5635cc0 100644
--- a/app/challenges-platform/models/Transformer.ts
+++ b/app/challenges-platform/models/Transformer.ts
@@ -34,6 +34,7 @@ export class BaseTransformer extends Transformer {
       format: Format.TEXT,
       points: payload.points,
       evaluation: Evaluation.MANUAL,
+      deleted: payload.deleted,
     });
     return challenge;
   }
diff --git a/app/challenges-platform/services/challenges-service.ts b/app/challenges-platform/services/challenges-service.ts
index 3899f22..d1ad752 100644
--- a/app/challenges-platform/services/challenges-service.ts
+++ b/app/challenges-platform/services/challenges-service.ts
@@ -93,8 +93,19 @@ export const update = async (): Promise<Result<Challenge, Error>> => {
   return Err(new Error("Not implemented"));
 };
 
-export const destroy = async (): Promise<Result<Challenge, Error>> => {
-  // TODO: should mark a challenge as deleted (soft delete)
-  // TODO: add a "deleted" boolean column to the challenges table
-  return Err(new Error("Not implemented"));
+export const destroy = async (
+  id: string,
+): Promise<Result<Challenge, Error>> => {
+  try {
+    const result = await db
+      .update(challenges)
+      .set({ deleted: true })
+      .where(eq(challenges.uuid, id))
+      .returning();
+    const transformer = challengesPlatform.findTransformer(result[0].type);
+    const challenge = transformer.newChallenge(result[0]);
+    return Ok(challenge);
+  } catch (e) {
+    return Err(new Error("Failed to mark challenge as deleted"));
+  }
 };
diff --git a/app/challenges-platform/services/submissions-service.ts b/app/challenges-platform/services/submissions-service.ts
index beaf221..5c2b181 100644
--- a/app/challenges-platform/services/submissions-service.ts
+++ b/app/challenges-platform/services/submissions-service.ts
@@ -33,8 +33,15 @@ export const findByUuid = async (
   if (!challengeResult.ok) {
     return Err(new Error("Failed to find challenge"));
   }
+<<<<<<< AJP/reviews-findByUuid
 
   const participantResult = await ParticipantsService.findById(record.participantId);
+=======
+  if (challengeResult.val.deleted === true) {
+    return Err(new Error("Challenge is deleted"));
+  }
+  const participantResult = await ParticipantsService.findByUuid(participantId);
+>>>>>>> main
   if (!participantResult.ok) {
     return Err(new Error("Failed to find participant"));
   } 
diff --git a/app/event-management/models/FlagChallenge.ts b/app/event-management/models/FlagChallenge.ts
index 5764880..dcc28e3 100644
--- a/app/event-management/models/FlagChallenge.ts
+++ b/app/event-management/models/FlagChallenge.ts
@@ -55,6 +55,7 @@ export class FlagChallenge extends Challenge {
       format,
       points,
       evaluation: Evaluation.AUTOMATIC,
+      deleted: false,
     });
     this.flag = flag;
   }
diff --git a/app/event-management/models/GithubIssueChallenge.ts b/app/event-management/models/GithubIssueChallenge.ts
index c4edce4..ab4b90b 100644
--- a/app/event-management/models/GithubIssueChallenge.ts
+++ b/app/event-management/models/GithubIssueChallenge.ts
@@ -54,6 +54,7 @@ export class GithubIssueChallenge extends Challenge {
       format: Format.MARKDOWN,
       points,
       evaluation: Evaluation.MANUAL,
+      deleted: false,
     });
   }
 }
diff --git a/app/event-management/models/PhotoChallenge.ts b/app/event-management/models/PhotoChallenge.ts
index 3fdbf31..c73406c 100644
--- a/app/event-management/models/PhotoChallenge.ts
+++ b/app/event-management/models/PhotoChallenge.ts
@@ -52,6 +52,7 @@ export class PhotoChallenge extends Challenge {
       format,
       points,
       evaluation: Evaluation.MANUAL,
+      deleted: false,
     });
   }
 }
diff --git a/db/schema.ts b/db/schema.ts
index ceba0e9..edc9b7a 100644
--- a/db/schema.ts
+++ b/db/schema.ts
@@ -11,6 +11,7 @@ export const challenges = sqliteTable("challenges", {
   metadata: text("metadata", { mode: "json" }),
   createdAt: text("created_at").default(sql`CURRENT_TIMESTAMP`),
   updatedAt: text("updated_at").default(sql`CURRENT_TIMESTAMP`),
+  deleted: integer("deleted", { mode: "boolean" }).notNull().default(false),
 });
 
 export const accessibleChallenges = sqliteTable("accessible_challenges", {
diff --git a/test/challenges-platform/custom-transformer.ts b/test/challenges-platform/custom-transformer.ts
index 6e9e7b8..32fe6fe 100644
--- a/test/challenges-platform/custom-transformer.ts
+++ b/test/challenges-platform/custom-transformer.ts
@@ -62,6 +62,7 @@ export class CustomChallenge extends Challenge {
       format,
       points,
       evaluation: Evaluation.MANUAL,
+      deleted: false,
     });
     this.propString = propString;
     this.propNumber = propNumber;
diff --git a/test/challenges-platform/services/challenges-service.test.ts b/test/challenges-platform/services/challenges-service.test.ts
index 918c72e..0cfa62a 100644
--- a/test/challenges-platform/services/challenges-service.test.ts
+++ b/test/challenges-platform/services/challenges-service.test.ts
@@ -72,9 +72,12 @@ describe("ChallengesService", () => {
 
   describe("destroy", () => {
     it("throws an error", async () => {
-      const result = await ChallengesService.destroy();
+      const challenge = await challengeFactory();
 
-      expect(result.err).toBe(true);
+      const result = await ChallengesService.destroy(challenge.uuid);
+
+      if (!result.ok) fail("Expected result to be Ok");
+      expect(result.val.deleted).toBe(true);
     });
   });
 
diff --git a/test/challenges-platform/services/submissions-service.test.ts b/test/challenges-platform/services/submissions-service.test.ts
index 2968085..7427d16 100644
--- a/test/challenges-platform/services/submissions-service.test.ts
+++ b/test/challenges-platform/services/submissions-service.test.ts
@@ -1,4 +1,7 @@
-import { SubmissionService } from "../../../app/challenges-platform";
+import {
+  ChallengesService,
+  SubmissionService,
+} from "../../../app/challenges-platform";
 import { challengeFactory } from "../factories/challenge-factory";
 import { participantFactory } from "../factories/participant-factory";
 
@@ -60,6 +63,25 @@ describe("SubmissionService", () => {
         expect(result.val.toString()).toBe("Error: Failed to find challenge");
       });
     });
+    describe("when challenge is deleted", () => {
+      it("returns an error", async () => {
+        const factory = await challengeFactory();
+        // Delete the challenge
+        const challenge = await ChallengesService.destroy(factory.uuid);
+        if (!challenge.ok)
+          fail("Expected challenge to be Ok, something went really wrong");
+
+        const participant = await participantFactory();
+
+        const result = await SubmissionService.create(
+          challenge.val.uuid,
+          participant.uuid,
+        );
+
+        expect(result.err).toBe(true);
+        expect(result.val.toString()).toBe("Error: Challenge is deleted");
+      });
+    });
     describe("when participant does not exist", () => {
       it("returns an error", async () => {
         const challenge = await challengeFactory();