diff --git a/backend/foundation/build.gradle.kts b/backend/foundation/build.gradle.kts
index c571853..e8140ec 100644
--- a/backend/foundation/build.gradle.kts
+++ b/backend/foundation/build.gradle.kts
@@ -1,6 +1,7 @@
 plugins {
-    id("buildlogic.spring-conventions")
+    id("buildlogic.kotlin-library-conventions")
     id("buildlogic.jooq-conventions")
+    kotlin("plugin.spring")
 }
 
 dependencies {
diff --git a/backend/foundation/src/main/kotlin/ru/ifmo/se/dating/security/auth/JwtTokenDecoder.kt b/backend/foundation/src/main/kotlin/ru/ifmo/se/dating/security/auth/JwtTokenDecoder.kt
index b273cf3..5e6db88 100644
--- a/backend/foundation/src/main/kotlin/ru/ifmo/se/dating/security/auth/JwtTokenDecoder.kt
+++ b/backend/foundation/src/main/kotlin/ru/ifmo/se/dating/security/auth/JwtTokenDecoder.kt
@@ -7,7 +7,6 @@ import ru.ifmo.se.dating.exception.AuthenticationException
 import java.security.PublicKey
 import java.time.Clock
 import java.util.*
-import javax.crypto.SecretKey
 
 class JwtTokenDecoder(
     private val clock: Clock,
diff --git a/backend/foundation/src/main/kotlin/ru/ifmo/se/dating/security/key/Keys.kt b/backend/foundation/src/main/kotlin/ru/ifmo/se/dating/security/key/Keys.kt
index 785d0e5..0b675d7 100644
--- a/backend/foundation/src/main/kotlin/ru/ifmo/se/dating/security/key/Keys.kt
+++ b/backend/foundation/src/main/kotlin/ru/ifmo/se/dating/security/key/Keys.kt
@@ -31,9 +31,7 @@ object Keys {
 
     private fun split(string: String): Pair<String, ByteArray> {
         val parts = string.split(":")
-        if (parts.size != 2) {
-            throw IllegalArgumentException("Invalid serialized key format")
-        }
+        require(parts.size == 2)
         val algorithm = parts[0]
         val encodedKey = parts[1]
         return algorithm to Base64.getDecoder().decode(encodedKey)
diff --git a/backend/foundation/src/main/kotlin/ru/ifmo/se/dating/spring/SpringClock.kt b/backend/foundation/src/main/kotlin/ru/ifmo/se/dating/spring/SpringClockConfiguration.kt
similarity index 100%
rename from backend/foundation/src/main/kotlin/ru/ifmo/se/dating/spring/SpringClock.kt
rename to backend/foundation/src/main/kotlin/ru/ifmo/se/dating/spring/SpringClockConfiguration.kt
diff --git a/backend/foundation/src/test/kotlin/ru/ifmo/se/dating/security/key/KeysTest.kt b/backend/foundation/src/test/kotlin/ru/ifmo/se/dating/security/key/KeysTest.kt
index 6f7e2ac..2839c8a 100644
--- a/backend/foundation/src/test/kotlin/ru/ifmo/se/dating/security/key/KeysTest.kt
+++ b/backend/foundation/src/test/kotlin/ru/ifmo/se/dating/security/key/KeysTest.kt
@@ -8,7 +8,7 @@ import javax.crypto.KeyGenerator
 class KeysTest {
     @Test
     fun secretRoundTrip() {
-        for (i in 0..32) {
+        repeat(32) {
             val key = KeyGenerator.getInstance("AES").generateKey()
             assertEquals(key, Keys.serialize(key).let { Keys.deserializeSecret(it) })
         }
@@ -16,10 +16,11 @@ class KeysTest {
 
     @Test
     fun publicRoundTrip() {
-        for (i in 0..8) {
+        repeat(8) {
             val pair = KeyPairGenerator.getInstance("RSA").genKeyPair()
-            assertEquals(pair.public, Keys.serialize(pair.public).let { Keys.deserializePublic(it) })
-            assertEquals(pair.private, Keys.serialize(pair.private).let { Keys.deserializePrivate(it) })
+            val (public, private) = pair.public to pair.private
+            assertEquals(public, Keys.deserializePublic(Keys.serialize(public)))
+            assertEquals(private, Keys.deserializePrivate(Keys.serialize(private)))
         }
     }