diff --git a/app/components/add-contributor/component.js b/app/components/add-contributor/component.js
index 32800c1..7e3b821 100644
--- a/app/components/add-contributor/component.js
+++ b/app/components/add-contributor/component.js
@@ -2,7 +2,6 @@ import Component from '@ember/component';
 import { and, notEmpty } from '@ember/object/computed';
 import { inject as service } from '@ember/service';
 
-
 export default Component.extend({
   kredits: service(),
 
@@ -14,6 +13,7 @@ export default Component.extend({
   isValidURL: notEmpty('url'),
   isValidGithubUID: notEmpty('github_uid'),
   isValidGithubUsername: notEmpty('github_username'),
+  isValidGiteaUsername: notEmpty('gitea_username'),
   isValidWikiUsername: notEmpty('wiki_username'),
   isValid: and(
     'isValidAccount',
@@ -21,10 +21,11 @@ export default Component.extend({
     'isValidGithubUID'
   ),
 
+  inProgress: false,
+
   init () {
     this._super(...arguments);
 
-    // Default attributes used by reset
     this.set('attributes', {
       account: null,
       name: null,
@@ -32,8 +33,8 @@ export default Component.extend({
       url: null,
       github_username: null,
       github_uid: null,
-      wiki_username: null,
-      isCore: false
+      gitea_username: null,
+      wiki_username: null
     });
   },
 
@@ -53,17 +54,19 @@ export default Component.extend({
         return;
       }
 
-      let attributes = Object.keys(this.attributes);
-      let contributor = this.getProperties(attributes);
-      let saved = this.save(contributor);
+      const attributes = Object.keys(this.attributes);
+      const contributor = this.getProperties(attributes);
 
-      // The promise handles inProgress
-      this.set('inProgress', saved);
+      this.set('inProgress', true);
 
-      saved.then(() => {
+      this.save(contributor).then(() => {
         this.reset();
         window.scroll(0,0);
-        window.alert('Contributor added.');
+      }).catch(err => {
+        console.log(err);
+        window.alert('Something went wrong. Please check the browser console.');
+      }).finally(() => {
+        this.set('inProgress', false);
       });
     }
   }
diff --git a/app/components/add-contributor/template.hbs b/app/components/add-contributor/template.hbs
index 235c535..fe98c5f 100644
--- a/app/components/add-contributor/template.hbs
+++ b/app/components/add-contributor/template.hbs
@@ -1,13 +1,4 @@
 <form {{action "submit" on="submit"}}>
-  <p>
-    {{input name="is-core"
-            type="checkbox"
-            id="is-core"
-            checked=isCore}}
-    <label for="is-core" class="checkbox">
-      Core team member (can add contributors)
-    </label>
-  </p>
   <p>
     {{input name="account"
             type="text"
@@ -49,6 +40,13 @@
             value=github_username
             class=(if isValidGithubUsername "valid" "")}}
   </p>
+  <p>
+    {{input name="gitea_username"
+            type="text"
+            placeholder="Gitea username"
+            value=gitea_username
+            class=(if isValidGiteaUsername "valid" "")}}
+  </p>
   <p>
     {{input name="wiki_username"
             type="text"
@@ -58,7 +56,7 @@
   </p>
   <p class="actions">
     {{input type="submit"
-            disabled=(is-pending inProgress)
-            value=(if (is-pending inProgress) "Processing" "Save")}}
+            disabled=inProgress
+            value=(if inProgress "Processing" "Save")}}
   </p>
 </form>
diff --git a/app/components/contributor-list/template.hbs b/app/components/contributor-list/template.hbs
index 3c5b4fb..adda000 100644
--- a/app/components/contributor-list/template.hbs
+++ b/app/components/contributor-list/template.hbs
@@ -12,7 +12,7 @@
     <tr class="metadata {{if (is-current-user contributor) "current-user"}} {{if contributor.showMetadata "visible"}}">
       <td colspan="2">
         <ul>
-          <li><a href="https://testnet.etherscan.io/address/{{contributor.account}}">Inspect Ethereum transactions</a></li>
+          <li><a href="https://rinkeby.etherscan.io/address/{{contributor.account}}">Inspect Ethereum transactions</a></li>
           {{#if contributor.ipfsHash}}
             <li><a href="https://ipfs.io/ipfs/{{contributor.ipfsHash}}">Inspect IPFS profile</a></li>
           {{/if}}
diff --git a/app/controllers/index.js b/app/controllers/index.js
index 825a03d..7b2cc77 100644
--- a/app/controllers/index.js
+++ b/app/controllers/index.js
@@ -2,6 +2,7 @@ import Controller from '@ember/controller';
 import { alias, filter, sort } from '@ember/object/computed';
 import { inject as service } from '@ember/service';
 import { computed } from '@ember/object';
+import { isPresent } from '@ember/utils';
 
 export default Controller.extend({
   kredits: service(),
@@ -9,7 +10,8 @@ export default Controller.extend({
 
   contributors: alias('kredits.contributors'),
   contributorsWithKredits: filter('contributors', function(contributor) {
-    return contributor.get('totalKreditsEarnedRaw').gt(0);
+    return isPresent(contributor.totalKreditsEarnedRaw) &&
+           contributor.totalKreditsEarnedRaw.gt(0);
   }),
   contributorsSorting: Object.freeze(['totalKreditsEarned:desc']),
   contributorsSorted: sort('contributorsWithKredits', 'contributorsSorting'),
@@ -47,7 +49,7 @@ export default Controller.extend({
 
     save (contributor) {
       return this.kredits.addContributor(contributor)
-        .then((contributor) => {
+        .then(contributor => {
           this.contributors.pushObject(contributor);
           return contributor;
         });
diff --git a/app/services/kredits.js b/app/services/kredits.js
index 12cd42c..ca78947 100644
--- a/app/services/kredits.js
+++ b/app/services/kredits.js
@@ -130,10 +130,15 @@ export default Service.extend({
   },
 
   addContributor(attributes) {
+    if (attributes.github_uid) {
+      const uidInt = parseInt(attributes.github_uid);
+      attributes.github_uid = uidInt;
+    }
+
     console.debug('[kredits] add contributor', attributes);
 
-    return this.kredits.Contributor.add(attributes)
-      .then((data) => {
+    return this.kredits.Contributor.add(attributes, { gasLimit: 350000 })
+      .then(data => {
         console.debug('[kredits] add contributor response', data);
         return Contributor.create(attributes);
       });
diff --git a/package-lock.json b/package-lock.json
index b20efe9..cc8d49b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10911,9 +10911,9 @@
       }
     },
     "kredits-contracts": {
-      "version": "5.2.0",
-      "resolved": "https://registry.npmjs.org/kredits-contracts/-/kredits-contracts-5.2.0.tgz",
-      "integrity": "sha512-XS8PN01SEiSNDKUhH28KVmGJ7hS3HlhT+CsaAMgqvU9ACcE1Wizqd0AxoRutUmJkILic6W6bQQ5gRqSHcBpPBA==",
+      "version": "5.3.0",
+      "resolved": "https://registry.npmjs.org/kredits-contracts/-/kredits-contracts-5.3.0.tgz",
+      "integrity": "sha512-Wz4zuA6yo0Q4WbVEO61fvFin+6VTNjkBqHPhHCqq6dIoGdFSjUZ3BCKan1ei0axIAda7ZDP+eebe2vCr+eqcHg==",
       "dev": true,
       "requires": {
         "ethers": "^4.0.27",
@@ -17139,9 +17139,9 @@
       "dev": true
     },
     "pull-to-stream": {
-      "version": "0.1.0",
-      "resolved": "https://registry.npmjs.org/pull-to-stream/-/pull-to-stream-0.1.0.tgz",
-      "integrity": "sha512-LMvdE0JwT7XQZMFjc7JDl/G9gmoZ8Zo8e86SG4ZZUcjuwvod803KxpAK8WrmdxzHsMRK9DETlIzuA0tbEVv6jg==",
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/pull-to-stream/-/pull-to-stream-0.1.1.tgz",
+      "integrity": "sha512-thZkMv6F9PILt9zdvpI2gxs19mkDrlixYKX6cOBxAW16i1NZH+yLAmF4r8QfJ69zuQh27e01JZP9y27tsH021w==",
       "dev": true,
       "requires": {
         "readable-stream": "^3.1.1"
diff --git a/package.json b/package.json
index 980bd03..bf43f95 100644
--- a/package.json
+++ b/package.json
@@ -56,7 +56,7 @@
     "eslint-plugin-ember": "^5.2.0",
     "ethers": "^4.0.27",
     "kosmos-schemas": "^2.0.0",
-    "kredits-contracts": "^5.2.0",
+    "kredits-contracts": "^5.3.0",
     "loader.js": "^4.7.0",
     "qunit-dom": "^0.8.0",
     "tv4": "^1.3.0"