diff --git a/.circleci/config.yml b/.circleci/config.yml
index 1acd4a4c..3dd6a457 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -149,7 +149,7 @@ workflows:
           context : org-global
           filters:
             branches:
-              only: ['develop', 'migration-setup']
+              only: ['develop', 'migration-setup', 'PM-577']
       - deployProd:
           context : org-global
           filters:
diff --git a/docs/swagger.yaml b/docs/swagger.yaml
index efe6e6d7..e38fbe25 100644
--- a/docs/swagger.yaml
+++ b/docs/swagger.yaml
@@ -11,10 +11,10 @@ info:
       You can also set a custom page size up to 100 with the `perPage` parameter.
 
       Pagination response data is included in http headers. By Default, the response header contains links with `next`, `last`, `first`, `prev` resource links.
-host: "localhost:3000"
+host: "api.topcoder-dev.com"
 basePath: /v5
 schemes:
-  - http
+  - https
 produces:
   - application/json
 consumes:
@@ -411,7 +411,7 @@ paths:
   "/projects/copilots/opportunities":
     get:
       tags:
-        - projects copilot opportunities
+        - projects copilot opportunity
       operationId: getAllCopilotOpportunities
       security:
         - Bearer: []
@@ -444,7 +444,7 @@ paths:
           description: "Internal Server Error"
           schema:
             $ref: "#/definitions/ErrorModel"
-  "/projects/copilots/opportunities/{copilotOpportunityId}":
+  "/projects/copilots/opportunity/{copilotOpportunityId}":
     get:
       tags:
         - projects copilot opportunity
@@ -471,6 +471,37 @@ paths:
           description: "Internal Server Error"
           schema:
             $ref: "#/definitions/ErrorModel"
+  "/projects/copilots/opportunity/{copilotOpportunityId}/apply":
+    post:
+      tags:
+        - projects copilot opportunity
+      operationId: applyCopilotOpportunity
+      security:
+        - Bearer: []
+      description: "Retrieve a specific copilot opportunity."
+      parameters:
+        - $ref: "#/parameters/copilotOpportunityIdParam"
+        - in: body
+          name: body
+          schema:
+            $ref: "#/definitions/ApplyCopilotOpportunity"
+      responses:
+        "200":
+          description: "The copilot opportunity"
+          schema:
+            $ref: "#/definitions/CopilotOpportunity"
+        "401":
+          description: "Unauthorized"
+          schema:
+            $ref: "#/definitions/ErrorModel"
+        "403":
+          description: "Forbidden - User does not have permission"
+          schema:
+            $ref: "#/definitions/ErrorModel"
+        "500":
+          description: "Internal Server Error"
+          schema:
+            $ref: "#/definitions/ErrorModel"
   "/projects/{projectId}/attachments":
     get:
       tags:
@@ -5448,6 +5479,13 @@ parameters:
     required: true
     type: integer
     format: int64
+  copilotOpportunityIdParam:
+    name: copilotOpportunityId
+    in: path
+    description: copilot opportunity identifier
+    required: true
+    type: integer
+    format: int64
   phaseIdParam:
     name: phaseId
     in: path
@@ -6184,6 +6222,13 @@ definitions:
           - customer
           - manager
           - copilot
+  ApplyCopilotOpportunity:
+    title: Apply copilot CopilotOpportunity
+    type: object
+    properties:
+      notes:
+        type: string
+        description: notes about applying copilot opportunity
   NewProjectAttachment:
     title: Project attachment request
     type: object
diff --git a/migrations/umzug/migrations/20250411182312-copilot_opportunity_apply.js b/migrations/umzug/migrations/20250411182312-copilot_opportunity_apply.js
new file mode 100644
index 00000000..7d29919e
--- /dev/null
+++ b/migrations/umzug/migrations/20250411182312-copilot_opportunity_apply.js
@@ -0,0 +1,60 @@
+'use strict';
+
+module.exports = {
+  up: async (queryInterface, Sequelize) => {
+    await queryInterface.createTable('copilot_applications', {
+      id: {
+        type: Sequelize.BIGINT,
+        allowNull: false,
+        primaryKey: true,
+        autoIncrement: true,
+      },
+      userId: {
+        type: Sequelize.BIGINT,
+        allowNull: false,
+      },
+      opportunityId: {
+        type: Sequelize.BIGINT,
+        allowNull: false,
+        references: {
+          model: 'copilot_opportunities',
+          key: 'id',
+        },
+        onUpdate: 'CASCADE',
+        onDelete: 'SET NULL',
+      },
+      notes: {
+        type: Sequelize.TEXT,
+        allowNull: true,
+      },
+      deletedAt: {
+        type: Sequelize.DATE,
+        allowNull: true,
+      },
+      createdAt: {
+        type: Sequelize.DATE,
+        allowNull: true,
+      },
+      updatedAt: {
+        type: Sequelize.DATE,
+        allowNull: true,
+      },
+      deletedBy: {
+        type: Sequelize.BIGINT,
+        allowNull: true,
+      },
+      createdBy: {
+        type: Sequelize.BIGINT,
+        allowNull: false,
+      },
+      updatedBy: {
+        type: Sequelize.BIGINT,
+        allowNull: false,
+      },
+    });
+  },
+
+  down: async (queryInterface) => {
+    await queryInterface.dropTable('copilot_applications');
+  }
+};
diff --git a/src/models/copilotApplication.js b/src/models/copilotApplication.js
new file mode 100644
index 00000000..c472da60
--- /dev/null
+++ b/src/models/copilotApplication.js
@@ -0,0 +1,42 @@
+import _ from 'lodash';
+
+module.exports = function defineCopilotOpportunity(sequelize, DataTypes) {
+  const CopilotApplication = sequelize.define('CopilotApplication', {
+    id: { type: DataTypes.BIGINT, primaryKey: true, autoIncrement: true },
+    opportunityId: {
+      type: DataTypes.BIGINT,
+      allowNull: false,
+      references: {
+        model: 'copilot_opportunities',
+        key: 'id'
+      },
+      onUpdate: 'CASCADE',
+      onDelete: 'CASCADE'
+    },
+    notes: {
+      type: DataTypes.TEXT,
+      allowNull: true
+    },
+    userId: { type: DataTypes.BIGINT, allowNull: false },
+    deletedAt: { type: DataTypes.DATE, allowNull: true },
+    createdAt: { type: DataTypes.DATE, defaultValue: DataTypes.NOW },
+    updatedAt: { type: DataTypes.DATE, defaultValue: DataTypes.NOW },
+    deletedBy: { type: DataTypes.INTEGER, allowNull: true },
+    createdBy: { type: DataTypes.INTEGER, allowNull: false },
+    updatedBy: { type: DataTypes.INTEGER, allowNull: false },
+  }, {
+    tableName: 'copilot_applications',
+    paranoid: true,
+    timestamps: true,
+    updatedAt: 'updatedAt',
+    createdAt: 'createdAt',
+    deletedAt: 'deletedAt',
+    indexes: [],
+  });
+
+  CopilotApplication.associate = (models) => {
+    CopilotApplication.belongsTo(models.CopilotOpportunity, { as: 'copilotOpportunity', foreignKey: 'opportunityId' });
+  };
+
+  return CopilotApplication;
+};
diff --git a/src/models/copilotOpportunity.js b/src/models/copilotOpportunity.js
index 7ce395c3..446cab81 100644
--- a/src/models/copilotOpportunity.js
+++ b/src/models/copilotOpportunity.js
@@ -38,6 +38,7 @@ module.exports = function defineCopilotOpportunity(sequelize, DataTypes) {
   CopilotOpportunity.associate = (models) => {
     CopilotOpportunity.belongsTo(models.CopilotRequest, { as: 'copilotRequest', foreignKey: 'copilotRequestId' });
     CopilotOpportunity.belongsTo(models.Project, { as: 'project', foreignKey: 'projectId' });
+    CopilotOpportunity.hasMany(models.CopilotApplication, { as: 'copilotApplications', foreignKey: 'opportunityId' });
   };
 
   return CopilotOpportunity;
diff --git a/src/permissions/constants.js b/src/permissions/constants.js
index b12c299f..4395021e 100644
--- a/src/permissions/constants.js
+++ b/src/permissions/constants.js
@@ -265,6 +265,18 @@ export const PERMISSION = { // eslint-disable-line import/prefer-default-export
     scopes: SCOPES_PROJECTS_WRITE,
   },
 
+  APPLY_COPILOT_OPPORTUNITY: {
+    meta: {
+      title: 'Apply copilot opportunity',
+      group: 'Apply Copilot',
+      description: 'Who can apply for copilot opportunity.',
+    },
+    topcoderRoles: [
+      USER_ROLE.COPILOT,
+    ],
+    scopes: SCOPES_PROJECTS_WRITE,
+  },
+
   MANAGE_PROJECT_BILLING_ACCOUNT_ID: {
     meta: {
       title: 'Manage Project property "billingAccountId"',
diff --git a/src/routes/copilotOpportunityApply/create.js b/src/routes/copilotOpportunityApply/create.js
new file mode 100644
index 00000000..dcf2cbe5
--- /dev/null
+++ b/src/routes/copilotOpportunityApply/create.js
@@ -0,0 +1,81 @@
+import _ from 'lodash';
+import validate from 'express-validation';
+import Joi from 'joi';
+
+import models from '../../models';
+import util from '../../util';
+import { PERMISSION } from '../../permissions/constants';
+import { COPILOT_OPPORTUNITY_STATUS } from '../../constants';
+
+const applyCopilotRequestValidations = {
+  body: Joi.object().keys({
+    notes: Joi.string(),
+  }),
+};
+
+module.exports = [
+  validate(applyCopilotRequestValidations),
+  async (req, res, next) => {
+    const { notes } = req.body;
+    const copilotOpportunityId = _.parseInt(req.params.id);
+    if (!util.hasPermissionByReq(PERMISSION.APPLY_COPILOT_OPPORTUNITY, req)) {
+      const err = new Error('Unable to apply for copilot opportunity');
+      _.assign(err, {
+        details: JSON.stringify({ message: 'You do not have permission to apply for copilot opportunity' }),
+        status: 403,
+      });
+      return next(err);
+    }
+
+    const data = {
+      userId: req.authUser.userId,
+      createdBy: req.authUser.userId,
+      updatedBy: req.authUser.userId,
+      opportunityId: copilotOpportunityId,
+      notes: notes ? req.sanitize(notes) : null,
+    };
+
+    return models.CopilotOpportunity.findOne({
+      where: {
+        id: copilotOpportunityId,
+      },
+    }).then(async (opportunity) => {
+      if (!opportunity) {
+        const err = new Error('No opportunity found');
+        err.status = 404;
+        return next(err);
+      }
+
+      if (opportunity.status !== COPILOT_OPPORTUNITY_STATUS.ACTIVE) {
+        const err = new Error('Opportunity is not active');
+        err.status = 400;
+        return next(err);
+      }
+
+      const existingApplication = await models.CopilotApplication.findOne({
+        where: {
+          opportunityId: opportunity.id,
+          userId: req.authUser.userId,
+        },
+      });
+
+      if (existingApplication) {
+        const err = new Error('User already applied for this opportunity');
+        err.status = 400;
+        return next(err);
+      }
+  
+      return models.CopilotApplication.create(data)
+        .then((result) => {
+          res.status(201).json(result);
+          return Promise.resolve();
+        })
+        .catch((err) => {
+        util.handleError('Error creating copilot application', err, req, next);
+        return next(err);
+      });
+    }).catch((e) => {
+      util.handleError('Error applying for copilot opportunity', e, req, next);
+    });
+  },
+];
diff --git a/src/routes/index.js b/src/routes/index.js
index f171dac3..137c3759 100644
--- a/src/routes/index.js
+++ b/src/routes/index.js
@@ -404,6 +404,10 @@ router.route('/v5/projects/copilots/opportunities')
 router.route('/v5/projects/copilot/opportunity/:id(\\d+)')
   .get(require('./copilotOpportunity/get'));
 
+// Project copilot opportunity apply
+router.route('/v5/projects/copilots/opportunity/:id(\\d+)/apply')
+  .post(require('./copilotOpportunityApply/create'));
+
 // Project Estimation Items
 router.route('/v5/projects/:projectId(\\d+)/estimations/:estimationId(\\d+)/items')
   .get(require('./projectEstimationItems/list'));