diff --git a/src/app/api/schema.ts b/src/app/api/schema.ts
index b809ef0..f03c6b0 100644
--- a/src/app/api/schema.ts
+++ b/src/app/api/schema.ts
@@ -75,7 +75,30 @@ export interface paths {
       path?: never
       cookie?: never
     }
-    get?: never
+    get: {
+      parameters: {
+        query?: never
+        header?: never
+        path: {
+          postId: string
+        }
+        cookie?: never
+      }
+      requestBody?: never
+      responses: {
+        /** @description OK */
+        200: {
+          headers: {
+            [name: string]: unknown
+          }
+          content: {
+            'text/plain': components['schemas']['GetPostResponse']
+            'application/json': components['schemas']['GetPostResponse']
+            'text/json': components['schemas']['GetPostResponse']
+          }
+        }
+      }
+    }
     put?: never
     post?: never
     delete: {
@@ -188,7 +211,8 @@ export interface paths {
       requestBody: {
         content: {
           'multipart/form-data': {
-            file?: components['schemas']['IFormFile']
+            /** Format: binary */
+            file?: string
           }
         }
       }
@@ -333,6 +357,78 @@ export interface paths {
     patch?: never
     trace?: never
   }
+  '/auth/change-password': {
+    parameters: {
+      query?: never
+      header?: never
+      path?: never
+      cookie?: never
+    }
+    get?: never
+    put?: never
+    post: {
+      parameters: {
+        query?: never
+        header?: never
+        path?: never
+        cookie?: never
+      }
+      requestBody: {
+        content: {
+          'application/json': components['schemas']['ChangePasswordRequestBody']
+          'text/json': components['schemas']['ChangePasswordRequestBody']
+          'application/*+json': components['schemas']['ChangePasswordRequestBody']
+        }
+      }
+      responses: {
+        /** @description OK */
+        200: {
+          headers: {
+            [name: string]: unknown
+          }
+          content?: never
+        }
+      }
+    }
+    delete?: never
+    options?: never
+    head?: never
+    patch?: never
+    trace?: never
+  }
+  '/auth/delete-current-session': {
+    parameters: {
+      query?: never
+      header?: never
+      path?: never
+      cookie?: never
+    }
+    get?: never
+    put?: never
+    post: {
+      parameters: {
+        query?: never
+        header?: never
+        path?: never
+        cookie?: never
+      }
+      requestBody?: never
+      responses: {
+        /** @description OK */
+        200: {
+          headers: {
+            [name: string]: unknown
+          }
+          content?: never
+        }
+      }
+    }
+    delete?: never
+    options?: never
+    head?: never
+    patch?: never
+    trace?: never
+  }
   '/auth/session': {
     parameters: {
       query?: never
@@ -390,9 +486,9 @@ export interface paths {
             [name: string]: unknown
           }
           content: {
-            'text/plain': components['schemas']['RefreshUserResult']
-            'application/json': components['schemas']['RefreshUserResult']
-            'text/json': components['schemas']['RefreshUserResult']
+            'text/plain': components['schemas']['GetUserInfoResult']
+            'application/json': components['schemas']['GetUserInfoResult']
+            'text/json': components['schemas']['GetUserInfoResult']
           }
         }
       }
@@ -465,6 +561,82 @@ export interface paths {
     patch?: never
     trace?: never
   }
+  '/auth/create-signup-code': {
+    parameters: {
+      query?: never
+      header?: never
+      path?: never
+      cookie?: never
+    }
+    get?: never
+    put?: never
+    post: {
+      parameters: {
+        query?: never
+        header?: never
+        path?: never
+        cookie?: never
+      }
+      requestBody: {
+        content: {
+          'application/json': components['schemas']['CreateSignupCodeRequest']
+          'text/json': components['schemas']['CreateSignupCodeRequest']
+          'application/*+json': components['schemas']['CreateSignupCodeRequest']
+        }
+      }
+      responses: {
+        /** @description OK */
+        200: {
+          headers: {
+            [name: string]: unknown
+          }
+          content?: never
+        }
+      }
+    }
+    delete?: never
+    options?: never
+    head?: never
+    patch?: never
+    trace?: never
+  }
+  '/auth/list-signup-codes': {
+    parameters: {
+      query?: never
+      header?: never
+      path?: never
+      cookie?: never
+    }
+    get: {
+      parameters: {
+        query?: never
+        header?: never
+        path?: never
+        cookie?: never
+      }
+      requestBody?: never
+      responses: {
+        /** @description OK */
+        200: {
+          headers: {
+            [name: string]: unknown
+          }
+          content: {
+            'text/plain': components['schemas']['ListSignupCodesResult']
+            'application/json': components['schemas']['ListSignupCodesResult']
+            'text/json': components['schemas']['ListSignupCodesResult']
+          }
+        }
+      }
+    }
+    put?: never
+    post?: never
+    delete?: never
+    options?: never
+    head?: never
+    patch?: never
+    trace?: never
+  }
 }
 export type webhooks = Record<string, never>
 export interface components {
@@ -472,6 +644,11 @@ export interface components {
     AddPostReactionRequest: {
       emoji: string
     }
+    ChangePasswordRequestBody: {
+      /** Format: uuid */
+      userId: string
+      newPassword: string
+    }
     CreatePostRequest: {
       /** Format: uuid */
       authorId: string
@@ -501,20 +678,25 @@ export interface components {
     DeletePostReactionRequest: {
       emoji: string
     }
-    /** Format: binary */
-    IFormFile: string
+    GetPostResponse: {
+      post: components['schemas']['PostDto']
+    }
+    GetUserInfoResult: {
+      /** Format: uuid */
+      userId: string
+      username: string
+      isSuperUser: boolean
+    }
     ListSignupCodesResult: {
       signupCodes: components['schemas']['SignupCodeDto'][]
     }
     LoadPostsResponse: {
       posts: components['schemas']['PostDto'][]
-      /** Format: uuid */
-      next: string | null
     }
     LoginRequest: {
       username: string
       password: string
-      rememberMe: boolean | null
+      rememberMe: boolean
     }
     LoginResponse: {
       /** Format: uuid */
@@ -548,21 +730,15 @@ export interface components {
     }
     PostReactionDto: {
       emoji: string
-      /** Format: int32 */
-      count: number
-      didReact: boolean
-    }
-    RefreshUserResult: {
-      /** Format: uuid */
-      userId: string
-      username: string
-      isSuperUser: boolean
+      authorName: string
+      /** Format: date-time */
+      reactedOn: string
     }
     RegisterRequest: {
       username: string
       password: string
       signupCode: string
-      rememberMe: boolean | null
+      rememberMe: boolean
     }
     RegisterResponse: {
       /** Format: uuid */
diff --git a/src/app/feed/components/PostItem.tsx b/src/app/feed/components/PostItem.tsx
index 05fcbb3..464f90f 100644
--- a/src/app/feed/components/PostItem.tsx
+++ b/src/app/feed/components/PostItem.tsx
@@ -1,15 +1,24 @@
-import { Post, PostMedia } from '../posts/posts.ts'
+import { PostMedia, PostReaction } from '../posts/posts.ts'
 import { useEffect, useState } from 'react'
 import { Link } from 'react-router-dom'
+import { PostInfo } from '../posts/usePostViewModel.ts'
+import { useUserStore } from '../../user/user.ts'
 
 interface PostItemProps {
-  post: Post
+  post: PostInfo
+  reactions: PostReaction[]
   addReaction: (emoji: string) => void
   clearReaction: (emoji: string) => void
   hideViewButton?: boolean
 }
 
-export default function PostItem({ post, addReaction, clearReaction, hideViewButton = false }: PostItemProps) {
+export default function PostItem({
+  post,
+  reactions,
+  addReaction,
+  clearReaction,
+  hideViewButton = false,
+}: PostItemProps) {
   const formattedDate = post.createdAt.toLocaleString('en-US', {
     year: 'numeric',
     month: 'short',
@@ -53,26 +62,30 @@ export default function PostItem({ post, addReaction, clearReaction, hideViewBut
         </div>
       )}
 
-      <PostReactions post={post} addReaction={addReaction} clearReaction={clearReaction} />
+      <PostReactions
+        post={post}
+        reactions={reactions}
+        addReaction={addReaction}
+        clearReaction={clearReaction}
+      />
     </article>
   )
 }
 
 interface PostReactionsProps {
-  post: Post
+  post: PostInfo
+  reactions: PostReaction[]
   addReaction: (emoji: string) => void
   clearReaction: (emoji: string) => void
 }
 
-function PostReactions({ post, addReaction, clearReaction }: PostReactionsProps) {
-  const reactionMap = new Map(post.reactions.map((r) => [r.emoji, r]))
-
+function PostReactions({ post, reactions, addReaction, clearReaction }: PostReactionsProps) {
+  const username = useUserStore((state) => state.user?.username)
   return (
     <div className="flex flex-wrap gap-2 mt-3 justify-end">
       {post.possibleReactions.map((emoji) => {
-        const reaction = reactionMap.get(emoji)
-        const count = reaction?.count ?? 0
-        const didReact = reaction?.didReact ?? false
+        const count = reactions.filter((r) => r.emoji === emoji).length
+        const didReact = reactions.some((r) => r.emoji == emoji && r.authorName == username)
         const onClick = () => {
           if (didReact) {
             clearReaction(emoji)
diff --git a/src/app/feed/pages/HomePage.tsx b/src/app/feed/pages/HomePage.tsx
index 35d994d..edef521 100644
--- a/src/app/feed/pages/HomePage.tsx
+++ b/src/app/feed/pages/HomePage.tsx
@@ -7,11 +7,11 @@ import SingleColumnLayout from '../../../layouts/SingleColumnLayout.tsx'
 import NavBar from '../../../components/NavBar.tsx'
 import AuthNavButtons from '../../auth/components/AuthNavButtons.tsx'
 import { useSaveSignupCodeToLocalStorage } from '../../../hooks/useSaveSignupCodeToLocalStorage.ts'
-import { Post } from '../posts/posts.ts'
-import { produce, WritableDraft } from 'immer'
 import PostItem from '../components/PostItem.tsx'
 import { useIntersectionLoad } from '../../../hooks/useIntersectionLoad.ts'
 import { delay } from '../../../utils/delay.ts'
+import { usePostViewModel } from '../posts/usePostViewModel.ts'
+import { Temporal } from '@js-temporal/polyfill'
 
 interface HomePageProps {
   postsService: PostsService
@@ -25,7 +25,8 @@ export default function HomePage({ postsService, mediaService }: HomePageProps)
   useSaveSignupCodeToLocalStorage()
   const [isSubmitting, setIsSubmitting] = useState(false)
 
-  const [posts, setPosts] = useState<Post[]>([])
+  const { posts, addPosts, addReaction, removeReaction, reactions } = usePostViewModel()
+
   const [hasMore, setHasMore] = useState(true)
   const [error, setError] = useState<string | null>(null)
 
@@ -37,14 +38,14 @@ export default function HomePage({ postsService, mediaService }: HomePageProps)
     loading.current = true
 
     try {
-      const [{ posts, next }] = await Promise.all([
+      const [{ posts }] = await Promise.all([
         postsService.loadPublicFeed(cursor.current, PageSize),
         delay(500),
       ])
 
       setHasMore(posts.length >= PageSize)
-      cursor.current = next
-      setPosts((prev) => [...prev, ...posts])
+      cursor.current = posts.at(-1)?.postId ?? null
+      addPosts(posts)
     } catch (e: unknown) {
       setError((e as Error).message)
     } finally {
@@ -73,7 +74,7 @@ export default function HomePage({ postsService, mediaService }: HomePageProps)
         }),
       )
       const post = await postsService.createNew(user.id, content, media, isPublic)
-      setPosts((pages) => [post, ...pages])
+      addPosts([post])
     } catch (error) {
       console.error('Failed to create post:', error)
     } finally {
@@ -86,37 +87,13 @@ export default function HomePage({ postsService, mediaService }: HomePageProps)
   const onAddReaction = async (postId: string, emoji: string) => {
     await postsService.addReaction(postId, emoji)
 
-    setPosts((prev) =>
-      produce(prev, (draft: WritableDraft<Post[]>) => {
-        const post = draft.find((p) => p.postId === postId)
-        if (!post) return
-
-        const theReaction = post.reactions.find((r) => r.emoji === emoji)
-        if (theReaction) {
-          theReaction.count++
-          theReaction.didReact = true
-        } else {
-          post.reactions.push({ emoji, count: 1, didReact: true })
-        }
-      }),
-    )
+    addReaction(postId, emoji, user!.username, Temporal.Now.instant())
   }
 
   const onClearReaction = async (postId: string, emoji: string) => {
     await postsService.removeReaction(postId, emoji)
 
-    setPosts((prev) =>
-      produce(prev, (draft: WritableDraft<Post[]>) => {
-        const post = draft.find((p) => p.postId === postId)
-        if (!post) return
-
-        const theReaction = post.reactions.find((r) => r.emoji === emoji)
-        if (theReaction) {
-          theReaction.count = Math.max(theReaction.count - 1, 0)
-          theReaction.didReact = false
-        }
-      }),
-    )
+    removeReaction(postId, emoji, user!.username)
   }
 
   const sentinelRef = useRef<HTMLDivElement | null>(null)
@@ -139,6 +116,7 @@ export default function HomePage({ postsService, mediaService }: HomePageProps)
                 <PostItem
                   key={post.postId}
                   post={post}
+                  reactions={reactions[post.postId] ?? []}
                   addReaction={(emoji) => onAddReaction(post.postId, emoji)}
                   clearReaction={(emoji) => onClearReaction(post.postId, emoji)}
                 />
diff --git a/src/app/feed/pages/PostPage.tsx b/src/app/feed/pages/PostPage.tsx
index 3569e6b..f81b89a 100644
--- a/src/app/feed/pages/PostPage.tsx
+++ b/src/app/feed/pages/PostPage.tsx
@@ -1,6 +1,5 @@
-import { useEffect, useState } from 'react'
+import { useEffect } from 'react'
 import { useParams } from 'react-router-dom'
-import { Post } from '../posts/posts.ts'
 import { PostsService } from '../posts/postsService.ts'
 import SingleColumnLayout from '../../../layouts/SingleColumnLayout.tsx'
 import NavBar from '../../../components/NavBar.tsx'
@@ -8,6 +7,9 @@ import AuthNavButtons from '../../auth/components/AuthNavButtons.tsx'
 import PostItem from '../components/PostItem.tsx'
 import NavButton from '../../../components/buttons/NavButton.tsx'
 import { useTranslations } from '../../i18n/translations.ts'
+import { usePostViewModel } from '../posts/usePostViewModel.ts'
+import { Temporal } from '@js-temporal/polyfill'
+import { useUserStore } from '../../user/user.ts'
 
 interface PostPageProps {
   postsService: PostsService
@@ -15,85 +17,32 @@ interface PostPageProps {
 
 export default function PostPage({ postsService }: PostPageProps) {
   const { postId } = useParams<{ postId: string }>()
-  const [post, setPost] = useState<Post | null>(null)
-  const [loading, setLoading] = useState(true)
-  const [error, setError] = useState<string | null>(null)
+  const { posts, setPosts, addReaction, reactions, removeReaction } = usePostViewModel()
   const { t } = useTranslations()
+  const username = useUserStore((state) => state.user?.username)
+
+  const post = posts.at(0)
 
   useEffect(() => {
-    const fetchPost = async () => {
-      if (!postId) {
-        setError('Post ID is required')
-        setLoading(false)
-        return
-      }
-
-      try {
-        // Load posts and find the one with matching ID
-        const { posts } = await postsService.loadPublicFeed(null, 100)
-        const foundPost = posts.find((p) => p.postId === postId)
-
-        if (foundPost) {
-          setPost(foundPost)
-        } else {
-          setError('Post not found')
-        }
-      } catch (e: unknown) {
-        setError((e as Error).message)
-      } finally {
-        setLoading(false)
-      }
-    }
-
-    fetchPost()
-  }, [postId, postsService])
+    if (!postId) return
+    postsService.load(postId).then((post) => setPosts(post ? [post] : []))
+  }, [postId, postsService, setPosts])
 
   const onAddReaction = async (emoji: string) => {
+    if (!username) return
     if (!post) return
 
     await postsService.addReaction(post.postId, emoji)
 
-    setPost((prevPost) => {
-      if (!prevPost) return null
-
-      const updatedReactions = [...prevPost.reactions]
-      const theReaction = updatedReactions.find((r) => r.emoji === emoji)
-
-      if (theReaction) {
-        theReaction.count++
-        theReaction.didReact = true
-      } else {
-        updatedReactions.push({ emoji, count: 1, didReact: true })
-      }
-
-      return {
-        ...prevPost,
-        reactions: updatedReactions,
-      }
-    })
+    addReaction(post.postId, emoji, username, Temporal.Now.instant())
   }
 
   const onClearReaction = async (emoji: string) => {
+    if (!username) return
     if (!post) return
 
     await postsService.removeReaction(post.postId, emoji)
-
-    setPost((prevPost) => {
-      if (!prevPost) return null
-
-      const updatedReactions = [...prevPost.reactions]
-      const theReaction = updatedReactions.find((r) => r.emoji === emoji)
-
-      if (theReaction) {
-        theReaction.count = Math.max(theReaction.count - 1, 0)
-        theReaction.didReact = false
-      }
-
-      return {
-        ...prevPost,
-        reactions: updatedReactions,
-      }
-    })
+    removeReaction(post.postId, emoji, username)
   }
 
   return (
@@ -106,14 +55,11 @@ export default function PostPage({ postsService }: PostPageProps) {
       }
     >
       <main className="w-full max-w-3xl mx-auto">
-        {loading && <div className="text-center py-8">Loading...</div>}
-
-        {error && <div className="text-center py-8 text-red-500">Error: {error}</div>}
-
         {post && (
           <div className="w-full">
             <PostItem
               post={post}
+              reactions={reactions[post.postId] ?? []}
               addReaction={onAddReaction}
               clearReaction={onClearReaction}
               hideViewButton={true}
diff --git a/src/app/feed/posts/posts.ts b/src/app/feed/posts/posts.ts
index bcd1b0b..7fe2547 100644
--- a/src/app/feed/posts/posts.ts
+++ b/src/app/feed/posts/posts.ts
@@ -2,10 +2,10 @@ import { Temporal } from '@js-temporal/polyfill'
 import { components } from '../../api/schema.ts'
 import { immerable } from 'immer'
 
-export interface EmojiReaction {
+export interface PostReaction {
   emoji: string
-  count: number
-  didReact: boolean
+  authorName: string
+  reactedOn: Temporal.Instant
 }
 
 export class Post {
@@ -16,7 +16,7 @@ export class Post {
   public readonly media: PostMedia[]
   public readonly createdAt: Temporal.Instant
   public readonly authorName: string
-  public readonly reactions: EmojiReaction[]
+  public readonly reactions: PostReaction[]
   public readonly possibleReactions: string[]
 
   constructor(
@@ -25,7 +25,7 @@ export class Post {
     media: PostMedia[],
     createdAt: string | Temporal.Instant,
     authorName: string,
-    reactions: EmojiReaction[] = [],
+    reactions: PostReaction[] = [],
     possibleReactions: string[] = [],
   ) {
     this.postId = postId
@@ -44,11 +44,7 @@ export class Post {
       dto.media.map((m) => new PostMediaImpl(new URL(m.url), m.width, m.height)),
       Temporal.Instant.from(dto.createdAt),
       dto.author.username,
-      dto.reactions.map((r) => ({
-        emoji: r.emoji,
-        count: r.count,
-        didReact: r.didReact,
-      })),
+      dto.reactions.map((r) => ({ ...r, reactedOn: Temporal.Instant.from(r.reactedOn) })),
       dto.possibleReactions,
     )
   }
diff --git a/src/app/feed/posts/postsService.ts b/src/app/feed/posts/postsService.ts
index 06fa2ff..11272e9 100644
--- a/src/app/feed/posts/postsService.ts
+++ b/src/app/feed/posts/postsService.ts
@@ -29,22 +29,34 @@ export class PostsService {
     return Post.fromDto(response.data.post)
   }
 
-  async loadPublicFeed(
-    cursor: string | null,
-    amount: number | null,
-  ): Promise<{ posts: Post[]; next: string | null }> {
+  async load(postId: string): Promise<Post | null> {
+    const response = await this.client.GET('/posts/{postId}', {
+      params: {
+        path: { postId },
+      },
+      credentials: 'include',
+    })
+
+    if (!response.data?.post) {
+      return null
+    }
+
+    return Post.fromDto(response.data.post)
+  }
+
+  async loadPublicFeed(cursor: string | null, amount: number | null): Promise<{ posts: Post[] }> {
     const response = await this.client.GET('/posts', {
       params: {
-        query: { From: cursor ?? undefined, Amount: amount ?? undefined },
+        query: { After: cursor ?? undefined, Amount: amount ?? undefined },
       },
       credentials: 'include',
     })
 
     if (!response.data) {
-      return { posts: [], next: null }
+      return { posts: [] }
     }
 
-    return { posts: response.data.posts.map(Post.fromDto), next: response.data.next }
+    return { posts: response.data.posts.map(Post.fromDto) }
   }
 
   async addReaction(postId: string, emoji: string): Promise<void> {
diff --git a/src/app/feed/posts/usePostViewModel.ts b/src/app/feed/posts/usePostViewModel.ts
new file mode 100644
index 0000000..74004ef
--- /dev/null
+++ b/src/app/feed/posts/usePostViewModel.ts
@@ -0,0 +1,82 @@
+import { useCallback, useState } from 'react'
+import { Post, PostMedia, PostReaction } from './posts.ts'
+import { Temporal } from '@js-temporal/polyfill'
+import { produce } from 'immer'
+
+export interface PostInfo {
+  postId: string
+  authorName: string
+  content: string
+  createdAt: Temporal.Instant
+  media: PostMedia[]
+  possibleReactions: string[]
+}
+
+type ReactionMap = Record<string, PostReaction[]>
+
+export function usePostViewModel() {
+  const [posts, _setPosts] = useState<PostInfo[]>([])
+  const [reactions, setReactions] = useState<ReactionMap>({})
+
+  const setPosts = useCallback((posts: Post[]) => {
+    _setPosts([...posts])
+
+    setReactions(
+      posts.reduce((acc, post) => {
+        acc[post.postId] = [...post.reactions]
+        return acc
+      }, {} as ReactionMap),
+    )
+  }, [])
+
+  const addPosts = useCallback((posts: Post[]) => {
+    _setPosts((current) => {
+      return [...current, ...posts]
+    })
+
+    setReactions((current) =>
+      produce(current, (draft) => {
+        for (const post of posts) {
+          draft[post.postId] = [...post.reactions]
+        }
+      }),
+    )
+  }, [])
+
+  function addReaction(
+    postId: string,
+    emoji: string,
+    authorName: string,
+    reactedOn: Temporal.Instant,
+  ) {
+    setReactions((current) =>
+      produce(current, (draft) => {
+        if (draft[postId]?.some((r) => r.emoji === emoji && r.authorName == authorName)) {
+          return
+        }
+
+        const reaction: PostReaction = { emoji, authorName, reactedOn }
+
+        if (!draft[postId]) {
+          draft[postId] = [{ ...reaction }]
+        } else {
+          draft[postId].push({ ...reaction })
+        }
+      }),
+    )
+  }
+
+  function removeReaction(postId: string, emoji: string, authorName: string) {
+    setReactions((current) =>
+      produce(current, (draft) => {
+        if (!draft[postId]) return
+
+        draft[postId] = draft[postId].filter(
+          (r) => r.emoji !== emoji || r.authorName !== authorName,
+        )
+      }),
+    )
+  }
+
+  return { posts, reactions, addPosts, setPosts, addReaction, removeReaction }
+}
diff --git a/src/utils/groupByAndMap.ts b/src/utils/groupByAndMap.ts
new file mode 100644
index 0000000..7f30995
--- /dev/null
+++ b/src/utils/groupByAndMap.ts
@@ -0,0 +1,19 @@
+export function groupByAndMap<T, U>(
+  items: T[],
+  groupBy: (item: T) => string,
+  map: (item: T) => U,
+): Record<string, U[]> {
+  const groupings: Record<string, U[]> = {}
+
+  for (const item of items) {
+    const key = groupBy(item)
+
+    if (!groupings[key]) {
+      groupings[key] = []
+    }
+
+    groupings[key].push(map(item))
+  }
+
+  return groupings
+}