diff --git a/apps/carrier-connector/internal/repository/profile.go b/apps/carrier-connector/internal/repository/profile.go
new file mode 100644
index 0000000..abf1a46
--- /dev/null
+++ b/apps/carrier-connector/internal/repository/profile.go
@@ -0,0 +1,137 @@
+package repository
+
+import (
+	"context"
+	"errors"
+	"sync"
+	"time"
+)
+
+// ErrNotFound is returned when a profile lookup misses.
+var ErrNotFound = errors.New("profile not found")
+
+// Profile is the stored representation of an eSIM profile.
+type Profile struct {
+	ICCID          string    `json:"iccid"`
+	EID            string    `json:"eid,omitempty"`
+	IMSI           string    `json:"imsi"`
+	MCC            string    `json:"mcc"`
+	MNC            string    `json:"mnc"`
+	ProfileType    string    `json:"profileType"`
+	State          string    `json:"state"` // e.g. provisioned, active, disabled, deleted
+	TenantID       string    `json:"tenantId,omitempty"`
+	ActivationCode string    `json:"activationCode,omitempty"`
+	CreatedAt      time.Time `json:"createdAt"`
+	UpdatedAt      time.Time `json:"updatedAt"`
+}
+
+// ListFilter narrows the List query.
+type ListFilter struct {
+	TenantID string
+	State    string
+	Limit    int
+	Offset   int
+}
+
+// ProfileRepository is the storage contract for eSIM profiles.
+type ProfileRepository interface {
+	Create(ctx context.Context, p *Profile) error
+	Get(ctx context.Context, iccid string) (*Profile, error)
+	List(ctx context.Context, f ListFilter) ([]*Profile, int, error)
+	UpdateState(ctx context.Context, iccid, state string) (*Profile, error)
+	Delete(ctx context.Context, iccid string) error
+}
+
+// InMemoryProfileStore is an in-memory ProfileRepository.
+// Safe for concurrent use. Intended as a development default; production
+// deployments should swap in a Postgres-backed implementation.
+type InMemoryProfileStore struct {
+	mu       sync.RWMutex
+	profiles map[string]*Profile
+}
+
+// NewInMemoryProfileStore constructs an empty InMemoryProfileStore.
+func NewInMemoryProfileStore() *InMemoryProfileStore {
+	return &InMemoryProfileStore{profiles: make(map[string]*Profile)}
+}
+
+// Create inserts a profile. Returns an error if the ICCID already exists.
+func (s *InMemoryProfileStore) Create(_ context.Context, p *Profile) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if _, exists := s.profiles[p.ICCID]; exists {
+		return errors.New("profile already exists")
+	}
+	now := time.Now().UTC()
+	p.CreatedAt = now
+	p.UpdatedAt = now
+	cp := *p
+	s.profiles[p.ICCID] = &cp
+	return nil
+}
+
+// Get returns a profile by ICCID or ErrNotFound.
+func (s *InMemoryProfileStore) Get(_ context.Context, iccid string) (*Profile, error) {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+	p, ok := s.profiles[iccid]
+	if !ok {
+		return nil, ErrNotFound
+	}
+	cp := *p
+	return &cp, nil
+}
+
+// List returns a filtered, paginated snapshot of profiles.
+func (s *InMemoryProfileStore) List(_ context.Context, f ListFilter) ([]*Profile, int, error) {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+
+	matched := make([]*Profile, 0, len(s.profiles))
+	for _, p := range s.profiles {
+		if f.TenantID != "" && p.TenantID != f.TenantID {
+			continue
+		}
+		if f.State != "" && p.State != f.State {
+			continue
+		}
+		cp := *p
+		matched = append(matched, &cp)
+	}
+
+	total := len(matched)
+	start := f.Offset
+	if start > total {
+		start = total
+	}
+	end := total
+	if f.Limit > 0 && start+f.Limit < total {
+		end = start + f.Limit
+	}
+	return matched[start:end], total, nil
+}
+
+// UpdateState updates a profile's state and UpdatedAt timestamp.
+func (s *InMemoryProfileStore) UpdateState(_ context.Context, iccid, state string) (*Profile, error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	p, ok := s.profiles[iccid]
+	if !ok {
+		return nil, ErrNotFound
+	}
+	p.State = state
+	p.UpdatedAt = time.Now().UTC()
+	cp := *p
+	return &cp, nil
+}
+
+// Delete removes a profile.
+func (s *InMemoryProfileStore) Delete(_ context.Context, iccid string) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if _, ok := s.profiles[iccid]; !ok {
+		return ErrNotFound
+	}
+	delete(s.profiles, iccid)
+	return nil
+}