diff --git a/internal/profile/repository.go b/internal/profile/repository.go
new file mode 100644
index 0000000..9b89398
--- /dev/null
+++ b/internal/profile/repository.go
@@ -0,0 +1,15 @@
+package profile
+
+import (
+	"context"
+
+	"golang.org/x/oauth2"
+
+	"source.toby3d.me/website/indieauth/internal/domain"
+)
+
+type Repository interface {
+	Get(ctx context.Context, token *oauth2.Token) (*domain.Profile, error)
+}
+
+var ErrNotExist error = domain.NewError(domain.ErrorCodeServerError, "not found link back to provided Me", "")
diff --git a/internal/profile/repository/github/github_profile.go b/internal/profile/repository/github/github_profile.go
new file mode 100644
index 0000000..b8e9865
--- /dev/null
+++ b/internal/profile/repository/github/github_profile.go
@@ -0,0 +1,76 @@
+package github
+
+import (
+	"context"
+	"fmt"
+
+	github "github.com/google/go-github/v41/github"
+	"golang.org/x/oauth2"
+
+	"source.toby3d.me/website/indieauth/internal/domain"
+	"source.toby3d.me/website/indieauth/internal/profile"
+)
+
+type githubProfileRepository struct{}
+
+const ErrPrefix string = "github"
+
+func NewGithubProfileRepository() profile.Repository {
+	return &githubProfileRepository{}
+}
+
+func (repo *githubProfileRepository) Get(ctx context.Context, token *oauth2.Token) (*domain.Profile, error) {
+	user, _, err := github.NewClient(oauth2.NewClient(ctx, oauth2.StaticTokenSource(token))).Users.Get(ctx, "")
+	if err != nil {
+		return nil, fmt.Errorf("%s: cannot get user info: %w", ErrPrefix, err)
+	}
+
+	result := new(domain.Profile)
+
+	// NOTE(toby3d): Profile names.
+	if user.Name != nil {
+		result.Name = []string{*user.Name}
+	}
+
+	// NOTE(toby3d): Profile photos.
+	if user.AvatarURL != nil {
+		if u, err := domain.ParseURL(*user.AvatarURL); err == nil {
+			result.Photo = []*domain.URL{u}
+		}
+	}
+
+	// NOTE(toby3d): Profile URLs.
+	result.URL = make([]*domain.URL, 0)
+	var twitterURL *string
+
+	if user.TwitterUsername != nil {
+		u := "https://twitter.com/" + *user.TwitterUsername
+		twitterURL = &u
+	}
+
+	for _, src := range []*string{
+		user.HTMLURL, // NOTE(toby3d): always available.
+		user.Blog,
+		twitterURL,
+	} {
+		if src == nil {
+			continue
+		}
+
+		u, err := domain.ParseURL(*src)
+		if err != nil {
+			continue
+		}
+
+		result.URL = append(result.URL, u)
+	}
+
+	// NOTE(toby3d): Profile Emails.
+	if user.Email != nil {
+		if email, err := domain.ParseEmail(*user.Email); err == nil {
+			result.Email = []*domain.Email{email}
+		}
+	}
+
+	return result, nil
+}
diff --git a/internal/profile/repository/gitlab/gitlab_profile.go b/internal/profile/repository/gitlab/gitlab_profile.go
new file mode 100644
index 0000000..7dad014
--- /dev/null
+++ b/internal/profile/repository/gitlab/gitlab_profile.go
@@ -0,0 +1,90 @@
+package gitlab
+
+import (
+	"context"
+	"fmt"
+
+	gitlab "github.com/xanzy/go-gitlab"
+	"golang.org/x/oauth2"
+
+	"source.toby3d.me/website/indieauth/internal/domain"
+	"source.toby3d.me/website/indieauth/internal/profile"
+)
+
+type gitlabProfileRepository struct{}
+
+const ErrPrefix string = "gitlab"
+
+func NewGitlabProfileRepository() profile.Repository {
+	return &gitlabProfileRepository{}
+}
+
+//nolint: funlen // NOTE(toby3d): uses hyphenation on new lines for readability.
+func (repo *gitlabProfileRepository) Get(_ context.Context, token *oauth2.Token) (*domain.Profile, error) {
+	client, err := gitlab.NewClient(token.AccessToken)
+	if err != nil {
+		return nil, fmt.Errorf("%s: cannot create client: %w", ErrPrefix, err)
+	}
+
+	user, _, err := client.Users.CurrentUser()
+	if err != nil {
+		return nil, fmt.Errorf("%s: cannot get user info: %w", ErrPrefix, err)
+	}
+
+	result := new(domain.Profile)
+
+	// NOTE(toby3d): Profile names.
+	if user.Name != "" {
+		result.Name = []string{user.Name}
+	}
+
+	// NOTE(toby3d): Profile photos.
+	if user.AvatarURL != "" {
+		if u, err := domain.ParseURL(user.AvatarURL); err == nil {
+			result.Photo = []*domain.URL{u}
+		}
+	}
+
+	// NOTE(toby3d): Profile URLs.
+	result.URL = make([]*domain.URL, 0)
+
+	for _, src := range []string{
+		user.WebURL, // NOTE(toby3d): always available.
+		user.WebsiteURL,
+		"https://twitter.com/" + user.Twitter,
+		// TODO(toby3d): Skype field
+		// TODO(toby3d): LinkedIn field
+	} {
+		if src == "" || src == "https://twitter.com/" {
+			continue
+		}
+
+		u, err := domain.ParseURL(user.WebsiteURL)
+		if err != nil {
+			continue
+		}
+
+		result.URL = append(result.URL, u)
+	}
+
+	// NOTE(toby3d): Profile Emails.
+	result.Email = make([]*domain.Email, 0)
+
+	for _, src := range []string{
+		user.PublicEmail,
+		user.Email,
+	} {
+		if src == "" {
+			continue
+		}
+
+		email, err := domain.ParseEmail(src)
+		if err != nil {
+			continue
+		}
+
+		result.Email = append(result.Email, email)
+	}
+
+	return result, nil
+}
diff --git a/internal/profile/repository/mastodon/mastodon_profile.go b/internal/profile/repository/mastodon/mastodon_profile.go
new file mode 100644
index 0000000..3fc9e16
--- /dev/null
+++ b/internal/profile/repository/mastodon/mastodon_profile.go
@@ -0,0 +1,77 @@
+package mastodon
+
+import (
+	"context"
+	"fmt"
+
+	mastodon "github.com/mattn/go-mastodon"
+	"golang.org/x/oauth2"
+
+	"source.toby3d.me/website/indieauth/internal/domain"
+	"source.toby3d.me/website/indieauth/internal/profile"
+)
+
+type mastodonProfileRepository struct {
+	server string
+}
+
+const ErrPrefix string = "mastodon"
+
+func NewMastodonProfileRepository(server string) profile.Repository {
+	return &mastodonProfileRepository{
+		server: server,
+	}
+}
+
+func (repo *mastodonProfileRepository) Get(ctx context.Context, token *oauth2.Token) (*domain.Profile, error) {
+	account, err := mastodon.NewClient(&mastodon.Config{
+		Server:      repo.server,
+		AccessToken: token.AccessToken,
+	}).GetAccountCurrentUser(ctx)
+	if err != nil {
+		return nil, fmt.Errorf("%s: cannot get account info: %w", ErrPrefix, err)
+	}
+
+	result := new(domain.Profile)
+
+	// NOTE(toby3d): Profile names.
+	if account.DisplayName != "" {
+		result.Name = []string{account.DisplayName}
+	}
+
+	// NOTE(toby3d): Profile photos.
+	if account.Avatar != "" {
+		if u, err := domain.ParseURL(account.Avatar); err == nil {
+			result.Photo = []*domain.URL{u}
+		}
+	}
+
+	// NOTE(toby3d): Profile URLs.
+	result.URL = make([]*domain.URL, 0)
+
+	// NOTE(toby3d): must be always available
+	if account.URL != "" {
+		if u, err := domain.ParseURL(account.URL); err == nil {
+			result.URL = append(result.URL, u)
+		}
+	}
+
+	for i := range account.Fields {
+		// NOTE(toby3d): ignore non-verified fields that contain either
+		// free-form text or links in them have not yet been verified.
+		if account.Fields[i].VerifiedAt.IsZero() {
+			continue
+		}
+
+		u, err := domain.ParseURL(account.Fields[i].Value)
+		if err != nil {
+			continue
+		}
+
+		result.URL = append(result.URL, u)
+	}
+
+	// WARN(toby3d): Mastodon does not provide an email via API.
+
+	return result, nil
+}
diff --git a/internal/profile/repository/memory/memory_profile.go b/internal/profile/repository/memory/memory_profile.go
new file mode 100644
index 0000000..78d19b7
--- /dev/null
+++ b/internal/profile/repository/memory/memory_profile.go
@@ -0,0 +1,42 @@
+package memory
+
+import (
+	"context"
+	"fmt"
+	"path"
+	"sync"
+
+	"golang.org/x/oauth2"
+
+	"source.toby3d.me/website/indieauth/internal/domain"
+	"source.toby3d.me/website/indieauth/internal/profile"
+)
+
+type memoryProfileRepository struct {
+	store *sync.Map
+}
+
+const (
+	ErrPrefix         string = "memory"
+	DefaultPathPrefix string = "profiles"
+)
+
+func NewMemoryProfileRepository(store *sync.Map) profile.Repository {
+	return &memoryProfileRepository{
+		store: store,
+	}
+}
+
+func (repo *memoryProfileRepository) Get(_ context.Context, token *oauth2.Token) (*domain.Profile, error) {
+	src, ok := repo.store.Load(path.Join(DefaultPathPrefix, token.AccessToken))
+	if !ok {
+		return nil, fmt.Errorf("%s: cannot find profile in store: %w", ErrPrefix, profile.ErrNotExist)
+	}
+
+	result, ok := src.(*domain.Profile)
+	if !ok {
+		return nil, fmt.Errorf("%s: cannot decode profile from store: %w", ErrPrefix, profile.ErrNotExist)
+	}
+
+	return result, nil
+}