diff --git a/internal/models/participant.go b/internal/models/participant.go
index 6ed0c83..a5e8fb3 100644
--- a/internal/models/participant.go
+++ b/internal/models/participant.go
@@ -1,10 +1,21 @@
 package models
 
-//type Participant struct {
-//	Id        *int32     `db:"id"`
-//	UserId    *int32     `db:"user_id"`
-//	ContestId *int32     `db:"contest_id"`
-//	Name      *string    `db:"name"`
-//	CreatedAt *time.Time `db:"created_at"`
-//	UpdatedAt *time.Time `db:"updated_at"`
-//}
+import "time"
+
+type Participant struct {
+	Id        int32     `db:"id"`
+	UserId    int32     `db:"user_id"`
+	ContestId int32     `db:"contest_id"`
+	Name      string    `db:"name"`
+	CreatedAt time.Time `db:"created_at"`
+	UpdatedAt time.Time `db:"updated_at"`
+}
+
+type ParticipantsListItem struct {
+	Id        int32     `db:"id"`
+	UserId    int32     `db:"user_id"`
+	ContestId int32     `db:"contest_id"`
+	Name      string    `db:"name"`
+	CreatedAt time.Time `db:"created_at"`
+	UpdatedAt time.Time `db:"updated_at"`
+}
diff --git a/internal/tester/delivery.go b/internal/tester/delivery.go
index 1764f57..15266da 100644
--- a/internal/tester/delivery.go
+++ b/internal/tester/delivery.go
@@ -10,12 +10,13 @@ type Handlers interface {
 	CreateContest(c *fiber.Ctx) error
 	DeleteContest(c *fiber.Ctx, id int32) error
 	GetContest(c *fiber.Ctx, id int32) error
-	DeleteParticipant(c *fiber.Ctx, id int32, params testerv1.DeleteParticipantParams) error
-	AddParticipant(c *fiber.Ctx, id int32, params testerv1.AddParticipantParams) error
-	DeleteTask(c *fiber.Ctx, id int32, params testerv1.DeleteTaskParams) error
-	AddTask(c *fiber.Ctx, id int32, params testerv1.AddTaskParams) error
+	DeleteParticipant(c *fiber.Ctx, params testerv1.DeleteParticipantParams) error
+	AddParticipant(c *fiber.Ctx, params testerv1.AddParticipantParams) error
+	DeleteTask(c *fiber.Ctx, params testerv1.DeleteTaskParams) error
+	AddTask(c *fiber.Ctx, params testerv1.AddTaskParams) error
 	ListProblems(c *fiber.Ctx, params testerv1.ListProblemsParams) error
 	CreateProblem(c *fiber.Ctx) error
 	DeleteProblem(c *fiber.Ctx, id int32) error
 	GetProblem(c *fiber.Ctx, id int32) error
+	ListParticipants(c *fiber.Ctx, params testerv1.ListParticipantsParams) error
 }
diff --git a/internal/tester/delivery/rest/handlers.go b/internal/tester/delivery/rest/handlers.go
index 0ef381c..208059a 100644
--- a/internal/tester/delivery/rest/handlers.go
+++ b/internal/tester/delivery/rest/handlers.go
@@ -150,7 +150,7 @@ func (h *TesterHandlers) GetContest(c *fiber.Ctx, id int32) error {
 	return c.JSON(resp)
 }
 
-func (h *TesterHandlers) DeleteParticipant(c *fiber.Ctx, id int32, params testerv1.DeleteParticipantParams) error {
+func (h *TesterHandlers) DeleteParticipant(c *fiber.Ctx, params testerv1.DeleteParticipantParams) error {
 	err := h.contestsUC.DeleteParticipant(c.Context(), params.ParticipantId)
 	if err != nil {
 		return c.SendStatus(pkg.ToREST(err))
@@ -159,8 +159,8 @@ func (h *TesterHandlers) DeleteParticipant(c *fiber.Ctx, id int32, params tester
 	return c.SendStatus(fiber.StatusOK)
 }
 
-func (h *TesterHandlers) AddParticipant(c *fiber.Ctx, id int32, params testerv1.AddParticipantParams) error {
-	id, err := h.contestsUC.AddParticipant(c.Context(), id, params.UserId)
+func (h *TesterHandlers) AddParticipant(c *fiber.Ctx, params testerv1.AddParticipantParams) error {
+	id, err := h.contestsUC.AddParticipant(c.Context(), params.ContestId, params.UserId)
 	if err != nil {
 		return c.SendStatus(pkg.ToREST(err))
 	}
@@ -170,7 +170,7 @@ func (h *TesterHandlers) AddParticipant(c *fiber.Ctx, id int32, params testerv1.
 	})
 }
 
-func (h *TesterHandlers) DeleteTask(c *fiber.Ctx, id int32, params testerv1.DeleteTaskParams) error {
+func (h *TesterHandlers) DeleteTask(c *fiber.Ctx, params testerv1.DeleteTaskParams) error {
 	err := h.contestsUC.DeleteTask(c.Context(), params.TaskId)
 	if err != nil {
 		return c.SendStatus(pkg.ToREST(err))
@@ -179,13 +179,15 @@ func (h *TesterHandlers) DeleteTask(c *fiber.Ctx, id int32, params testerv1.Dele
 	return c.SendStatus(fiber.StatusOK)
 }
 
-func (h *TesterHandlers) AddTask(c *fiber.Ctx, id int32, params testerv1.AddTaskParams) error {
-	id, err := h.contestsUC.AddTask(c.Context(), id, params.ProblemId)
+func (h *TesterHandlers) AddTask(c *fiber.Ctx, params testerv1.AddTaskParams) error {
+	id, err := h.contestsUC.AddTask(c.Context(), params.ContestId, params.ProblemId)
 	if err != nil {
 		return c.SendStatus(pkg.ToREST(err))
 	}
 
-	return c.SendStatus(fiber.StatusNotImplemented)
+	return c.JSON(testerv1.AddTaskResponse{
+		Id: id,
+	})
 }
 
 func (h *TesterHandlers) CreateProblem(c *fiber.Ctx) error {
@@ -231,3 +233,33 @@ func (h *TesterHandlers) GetProblem(c *fiber.Ctx, id int32) error {
 		}},
 	)
 }
+
+func (h *TesterHandlers) ListParticipants(c *fiber.Ctx, params testerv1.ListParticipantsParams) error {
+	participants, count, err := h.contestsUC.ListParticipants(c.Context(), params.ContestId, params.Page, params.PageSize)
+	if err != nil {
+		return c.SendStatus(pkg.ToREST(err))
+	}
+
+	resp := testerv1.ListParticipantsResponse{
+		Participants: make([]testerv1.ParticipantsListItem, len(participants)),
+		Page:         params.Page,
+		MaxPage: func() int32 {
+			if count%params.PageSize == 0 {
+				return count / params.PageSize
+			}
+			return count/params.PageSize + 1
+		}(),
+	}
+
+	for i, participant := range participants {
+		resp.Participants[i] = testerv1.ParticipantsListItem{
+			Id:        participant.Id,
+			UserId:    participant.UserId,
+			Name:      participant.Name,
+			CreatedAt: participant.CreatedAt,
+			UpdatedAt: participant.UpdatedAt,
+		}
+	}
+
+	return c.JSON(resp)
+}
diff --git a/internal/tester/pg_repository.go b/internal/tester/pg_repository.go
index 0d610c4..1718f85 100644
--- a/internal/tester/pg_repository.go
+++ b/internal/tester/pg_repository.go
@@ -22,4 +22,5 @@ type ContestRepository interface {
 	DeleteParticipant(ctx context.Context, participantId int32) error
 	ReadRichTasks(ctx context.Context, contestId int32) ([]*models.RichTask, error)
 	ListContests(ctx context.Context, page int32, pageSize int32) ([]*models.ContestsListItem, int32, error)
+	ListParticipants(ctx context.Context, contestId int32, page int32, pageSize int32) ([]*models.ParticipantsListItem, int32, error)
 }
diff --git a/internal/tester/repository/pg_contests_repository.go b/internal/tester/repository/pg_contests_repository.go
index 4325866..b774955 100644
--- a/internal/tester/repository/pg_contests_repository.go
+++ b/internal/tester/repository/pg_contests_repository.go
@@ -174,11 +174,41 @@ func (r *ContestRepository) ListContests(ctx context.Context, page int32, pageSi
 		return nil, 0, handlePgErr(err, op)
 	}
 
+	query = r.db.Rebind(countContestsQuery)
 	var count int32
-	err = r.db.GetContext(ctx, &count, countContestsQuery)
+	err = r.db.GetContext(ctx, &count, query)
 	if err != nil {
 		return nil, 0, handlePgErr(err, op)
 	}
 
 	return tasks, count, nil
 }
+
+const (
+	readParticipantsListQuery = `SELECT id, user_id, name, created_at, updated_at FROM participants WHERE contest_id = ? LIMIT ? OFFSET ?`
+	countParticipantsQuery    = "SELECT COUNT(*) FROM participants WHERE contest_id = ?"
+)
+
+func (r *ContestRepository) ListParticipants(ctx context.Context, contestId int32, page int32, pageSize int32) ([]*models.ParticipantsListItem, int32, error) {
+	const op = "ContestRepository.ReadParticipants"
+
+	if pageSize > 20 {
+		pageSize = 1
+	}
+
+	var participants []*models.ParticipantsListItem
+	query := r.db.Rebind(readParticipantsListQuery)
+	err := r.db.SelectContext(ctx, &participants, query, contestId, pageSize, (page-1)*pageSize)
+	if err != nil {
+		return nil, 0, handlePgErr(err, op)
+	}
+
+	query = r.db.Rebind(countParticipantsQuery)
+	var count int32
+	err = r.db.GetContext(ctx, &count, query, contestId)
+	if err != nil {
+		return nil, 0, handlePgErr(err, op)
+	}
+
+	return participants, count, nil
+}
diff --git a/internal/tester/repository/pg_problems_repository.go b/internal/tester/repository/pg_problems_repository.go
index 4108746..400b217 100644
--- a/internal/tester/repository/pg_problems_repository.go
+++ b/internal/tester/repository/pg_problems_repository.go
@@ -89,8 +89,10 @@ func (r *ProblemRepository) ListProblems(ctx context.Context, page int32, pageSi
 		return nil, 0, handlePgErr(err, op)
 	}
 
+	query = r.db.Rebind(CountProblemsQuery)
+
 	var count int32
-	err = r.db.GetContext(ctx, &count, CountProblemsQuery)
+	err = r.db.GetContext(ctx, &count, query)
 	if err != nil {
 		return nil, 0, handlePgErr(err, op)
 	}
diff --git a/internal/tester/usecase.go b/internal/tester/usecase.go
index 7db6c68..e706910 100644
--- a/internal/tester/usecase.go
+++ b/internal/tester/usecase.go
@@ -22,4 +22,5 @@ type ContestUseCase interface {
 	DeleteParticipant(ctx context.Context, participantId int32) error
 	ReadRichTasks(ctx context.Context, contestId int32) ([]*models.RichTask, error)
 	ListContests(ctx context.Context, page int32, pageSize int32) ([]*models.ContestsListItem, int32, error)
+	ListParticipants(ctx context.Context, contestId int32, page int32, pageSize int32) ([]*models.ParticipantsListItem, int32, error)
 }
diff --git a/internal/tester/usecase/contests_usecase.go b/internal/tester/usecase/contests_usecase.go
index 06759e2..75c495c 100644
--- a/internal/tester/usecase/contests_usecase.go
+++ b/internal/tester/usecase/contests_usecase.go
@@ -53,3 +53,7 @@ func (uc *ContestUseCase) ReadRichTasks(ctx context.Context, contestId int32) ([
 func (uc *ContestUseCase) ListContests(ctx context.Context, page int32, pageSize int32) ([]*models.ContestsListItem, int32, error) {
 	return uc.contestRepo.ListContests(ctx, page, pageSize)
 }
+
+func (uc *ContestUseCase) ListParticipants(ctx context.Context, contestId int32, page int32, pageSize int32) ([]*models.ParticipantsListItem, int32, error) {
+	return uc.contestRepo.ListParticipants(ctx, contestId, page, pageSize)
+}
diff --git a/proto b/proto
index ac0eb56..3913140 160000
--- a/proto
+++ b/proto
@@ -1 +1 @@
-Subproject commit ac0eb56bb9dee9f0933f858e16d61c9e40c89a29
+Subproject commit 391314039942e437907d9d562d8973a80e290e4e