diff --git a/.gitignore b/.gitignore
index 9b9052d6..66f38ea8 100755
--- a/.gitignore
+++ b/.gitignore
@@ -11,3 +11,6 @@ debug.test
 
 # Coverage
 coverage.*
+
+# Linter
+golangci-report.xml
diff --git a/cfg/default.go b/cfg/default.go
old mode 100755
new mode 100644
index ce96f15c..fb1367f4
--- a/cfg/default.go
+++ b/cfg/default.go
@@ -15,7 +15,7 @@
 package cfg
 
 // DefaultConfig is the default configuration for golium.
-// This default configuration can be overriden with environment variables.
+// This default configuration can be overridden with environment variables.
 var DefaultConfig = Config{
 	Suite:       "golium",
 	Environment: "local",
diff --git a/context.go b/context.go
index e4434c90..ee8c078b 100755
--- a/context.go
+++ b/context.go
@@ -21,7 +21,7 @@ import (
 // ContextKey defines a type to store the Context in context.Context.
 type ContextKey string
 
-var contextKey ContextKey = "contextKey"
+const contextKey ContextKey = "contextKey"
 
 // Context contains the context required for common utilities.
 // It contains a map[string]interface{} to store global values and find them with [CTXT:xxx] tag.
diff --git a/mock/http/model.go b/mock/http/model.go
index e074241e..3ab3e361 100644
--- a/mock/http/model.go
+++ b/mock/http/model.go
@@ -16,7 +16,7 @@ package http
 
 import "encoding/json"
 
-// MockRequest contains the instruction to configure the behaviour of the HTTP mock server.
+// MockRequest contains the instruction to configure the behavior of the HTTP mock server.
 // The document configures which request is going to be attended (e.g. the path and method)
 // and the response to be generated by the mock.
 type MockRequest struct {
diff --git a/sonar-project.properties b/sonar-project.properties
index 98f12546..b42e06bb 100644
--- a/sonar-project.properties
+++ b/sonar-project.properties
@@ -4,6 +4,7 @@ sonar.organization=telefonicatc2tech
 
 sonar.go.coverage.reportPaths=coverage.txt
 sonar.go.golangci-lint.reportPaths=golangci-report.xml
+sonar.coverage.exclusions=**/*context.go
 
 sonar.sources=.
 sonar.exclusions=**/*_test.go
diff --git a/steps/dns/context.go b/steps/dns/context.go
index 2d99ce2f..7adaf7c1 100755
--- a/steps/dns/context.go
+++ b/steps/dns/context.go
@@ -21,13 +21,12 @@ import (
 // ContextKey defines a type to store the Context in context.Context.
 type ContextKey string
 
-var contextKey ContextKey = "dnsSession"
+const contextKey ContextKey = "dnsSession"
 
 // InitializeContext adds the DNS Session to the context.
 // The new context is returned because context is immutable.
 func InitializeContext(ctx context.Context) context.Context {
-	session := Session{}
-	return context.WithValue(ctx, contextKey, &session)
+	return context.WithValue(ctx, contextKey, &Session{})
 }
 
 // GetSession returns the DNS session stored in context.
diff --git a/steps/dns/session.go b/steps/dns/session.go
old mode 100755
new mode 100644
index 5ef272da..b01c916c
--- a/steps/dns/session.go
+++ b/steps/dns/session.go
@@ -106,7 +106,7 @@ func (s *Session) SendUDPQuery(ctx context.Context, qtype uint16, qdomain string
 func (s *Session) SendDoHQuery(ctx context.Context, method string, qtype uint16, qdomain string, recursive bool) error {
 	logger := GetLogger()
 	corr := uuid.New().String()
-	//Set DNS query
+	// Set DNS query
 	m := &dns.Msg{}
 	m.SetQuestion(dns.Fqdn(qdomain), qtype)
 	m.RecursionDesired = recursive
@@ -177,7 +177,7 @@ func (s *Session) SendDoHQuery(ctx context.Context, method string, qtype uint16,
 func (s *Session) SendDoTQuery(ctx context.Context, qtype uint16, qdomain string, recursive bool) error {
 	logger := GetLogger()
 	corr := uuid.New().String()
-	//Set DNS query
+	// Set DNS query
 	opts := upstream.Options{
 		Timeout:            s.Timeout,
 		InsecureSkipVerify: true,
diff --git a/steps/elasticsearch/context.go b/steps/elasticsearch/context.go
index 430231cf..03236bcc 100755
--- a/steps/elasticsearch/context.go
+++ b/steps/elasticsearch/context.go
@@ -21,13 +21,12 @@ import (
 // ContextKey defines a type to store the elasticsearch session in context.Context.
 type ContextKey string
 
-var contextKey ContextKey = "elasticsearchSession"
+const contextKey ContextKey = "elasticsearchSession"
 
 // InitializeContext adds the elasticsearch session to the context.
 // The new context is returned because context is immutable.
 func InitializeContext(ctx context.Context) context.Context {
-	var session Session
-	return context.WithValue(ctx, contextKey, &session)
+	return context.WithValue(ctx, contextKey, &Session{})
 }
 
 // GetSession returns the elasticsearch session stored in context.
diff --git a/steps/http/context.go b/steps/http/context.go
index a683c6e8..938f43de 100755
--- a/steps/http/context.go
+++ b/steps/http/context.go
@@ -21,13 +21,12 @@ import (
 // ContextKey defines a type to store the HTTP session in context.Context.
 type ContextKey string
 
-var contextKey ContextKey = "httpSession"
+const contextKey ContextKey = "httpSession"
 
 // InitializeContext adds the HTTP session to the context.
 // The new context is returned because context is immutable.
 func InitializeContext(ctx context.Context) context.Context {
-	var session Session
-	return context.WithValue(ctx, contextKey, &session)
+	return context.WithValue(ctx, contextKey, &Session{})
 }
 
 // GetSession returns the HTTP session stored in context.
diff --git a/steps/http/json_test.go b/steps/http/json_test.go
index 079c78a3..5858c483 100644
--- a/steps/http/json_test.go
+++ b/steps/http/json_test.go
@@ -3,6 +3,7 @@ package http
 import (
 	"context"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io/ioutil"
 	"os"
@@ -15,7 +16,6 @@ import (
 
 func TestGetParamFromJSON(t *testing.T) {
 	t.Run("Should return selected value from JSON file", func(t *testing.T) {
-
 		var JSONhttpFileValues = `
 		[
 			{
@@ -61,7 +61,7 @@ func TestGetParamFromJSON(t *testing.T) {
             ]
         }`
 		var expectedParam interface{}
-		if err := json.Unmarshal([]byte(fmt.Sprint(JSON)), &expectedParam); err != nil {
+		if err := json.Unmarshal([]byte(JSON), &expectedParam); err != nil {
 			t.Error("error Unmarshaling expected response body: %w", err)
 		}
 
@@ -114,12 +114,12 @@ func TestFindValueByCode(t *testing.T) {
 		]
 	}`
 	var expectedValue interface{}
-	if err := json.Unmarshal([]byte(fmt.Sprint(JSON)), &expectedValue); err != nil {
+	if err := json.Unmarshal([]byte(JSON), &expectedValue); err != nil {
 		t.Error("error Unmarshaling expected response body: %w", err)
 	}
 
 	dataStruct := []map[string]interface{}{}
-	if err := json.Unmarshal([]byte(fmt.Sprint(JSONhttpFileValues)), &dataStruct); err != nil {
+	if err := json.Unmarshal([]byte(JSONhttpFileValues), &dataStruct); err != nil {
 		t.Error("error Unmarshaling expected response body: %w", err)
 	}
 
@@ -162,7 +162,6 @@ func TestFindValueByCode(t *testing.T) {
 			}
 		})
 	}
-
 }
 
 func TestLoadJSONData(t *testing.T) {
@@ -201,7 +200,7 @@ func TestUnmarshalJSONData(t *testing.T) {
 		}`
 
 	var message = "error unmarshalling JSON data due to error: json: cannot unmarshal object into Go value of type []map[string]interface {}"
-	formatError := fmt.Errorf(message)
+	formatError := errors.New(message)
 	var expected interface{}
 	if err := json.Unmarshal([]byte(expectedString), &expected); err != nil {
 		t.Error("error Unmarshaling expected response body: %w", err)
@@ -237,7 +236,6 @@ func TestUnmarshalJSONData(t *testing.T) {
 			if JSONEquals(tc.expected, unmarshalled) {
 				t.Errorf("expected unmarshalled data error:\n%v", err)
 			}
-
 		})
 	}
 }
@@ -273,17 +271,17 @@ func TestJSONEquals(t *testing.T) {
 		]
 	}`
 	var expected interface{}
-	if err := json.Unmarshal([]byte(fmt.Sprint(expectedString)), &expected); err != nil {
+	if err := json.Unmarshal([]byte(expectedString), &expected); err != nil {
 		t.Error("error Unmarshaling expected response body: %w", err)
 	}
 
 	var different interface{}
-	if err := json.Unmarshal([]byte(fmt.Sprint(differentString)), &different); err != nil {
+	if err := json.Unmarshal([]byte(differentString), &different); err != nil {
 		t.Error("error Unmarshaling expected response body: %w", err)
 	}
 
 	var current interface{}
-	if err := json.Unmarshal([]byte(fmt.Sprint(currentString)), &current); err != nil {
+	if err := json.Unmarshal([]byte(currentString), &current); err != nil {
 		t.Error("error Unmarshaling expected response body: %w", err)
 	}
 
@@ -312,8 +310,6 @@ func TestJSONEquals(t *testing.T) {
 				t.Errorf("expected JSON comparison should be %t \n%v\n vs \n%v", tc.equals, tc.expected,
 					tc.current)
 			}
-
 		})
 	}
-
 }
diff --git a/steps/jwt/context.go b/steps/jwt/context.go
index 94467e88..0adfe8a1 100755
--- a/steps/jwt/context.go
+++ b/steps/jwt/context.go
@@ -21,13 +21,12 @@ import (
 // ContextKey defines a type to store the JWT session in context.Context.
 type ContextKey string
 
-var contextKey ContextKey = "jwtSession"
+const contextKey ContextKey = "jwtSession"
 
 // InitializeContext adds the JWT session to the context.
 // The new context is returned because context is immutable.
 func InitializeContext(ctx context.Context) context.Context {
-	var session Session
-	return context.WithValue(ctx, contextKey, &session)
+	return context.WithValue(ctx, contextKey, &Session{})
 }
 
 // GetSession returns the HTTP session stored in context.
diff --git a/steps/rabbit/context.go b/steps/rabbit/context.go
index 3d6d2568..c7ae3d54 100755
--- a/steps/rabbit/context.go
+++ b/steps/rabbit/context.go
@@ -21,13 +21,12 @@ import (
 // ContextKey defines a type to store the rabbit session in context.Context.
 type ContextKey string
 
-var contextKey ContextKey = "rabbitSession"
+const contextKey ContextKey = "rabbitSession"
 
 // InitializeContext adds the rabbit session to the context.
 // The new context is returned because context is immutable.
 func InitializeContext(ctx context.Context) context.Context {
-	var session Session
-	return context.WithValue(ctx, contextKey, &session)
+	return context.WithValue(ctx, contextKey, &Session{})
 }
 
 // GetSession returns the rabbit session stored in context.
diff --git a/steps/rabbit/session.go b/steps/rabbit/session.go
old mode 100755
new mode 100644
index 135910dc..445eb4e3
--- a/steps/rabbit/session.go
+++ b/steps/rabbit/session.go
@@ -139,7 +139,7 @@ func (s *Session) SubscribeTopic(ctx context.Context, topic string) error {
 	return nil
 }
 
-// Unsubscribe unsubscribes from rabbit closing the channel asociated.
+// Unsubscribe unsubscribes from rabbit closing the channel associated.
 // If this method is not invoked, then the goroutine created with SubscribeTopic is never closed
 // and will permanently processing messages from the topic until the program is finished.
 func (s *Session) Unsubscribe(ctx context.Context) error {
diff --git a/steps/redis/context.go b/steps/redis/context.go
index 0ba2c12c..bffb6678 100755
--- a/steps/redis/context.go
+++ b/steps/redis/context.go
@@ -21,13 +21,12 @@ import (
 // ContextKey defines a type to store the redis session in context.Context.
 type ContextKey string
 
-var contextKey ContextKey = "redisSession"
+const contextKey ContextKey = "redisSession"
 
 // InitializeContext adds the redis session to the context.
 // The new context is returned because context is immutable.
 func InitializeContext(ctx context.Context) context.Context {
-	var session Session
-	return context.WithValue(ctx, contextKey, &session)
+	return context.WithValue(ctx, contextKey, &Session{})
 }
 
 // GetSession returns the redis session stored in context.
diff --git a/steps/s3/context.go b/steps/s3/context.go
index 5bdaea07..8c1f1bc3 100755
--- a/steps/s3/context.go
+++ b/steps/s3/context.go
@@ -21,13 +21,12 @@ import (
 // ContextKey defines a type to store the s3 session in context.Context.
 type ContextKey string
 
-var contextKey ContextKey = "s3Session"
+const contextKey ContextKey = "s3Session"
 
 // InitializeContext adds the s3 session to the context.
 // The new context is returned because context is immutable.
 func InitializeContext(ctx context.Context) context.Context {
-	var session Session
-	return context.WithValue(ctx, contextKey, &session)
+	return context.WithValue(ctx, contextKey, &Session{})
 }
 
 // GetSession returns the s3 session stored in context.
diff --git a/test/acceptance/steps/aggregated/context.go b/test/acceptance/steps/aggregated/context.go
index 95973657..660bb876 100755
--- a/test/acceptance/steps/aggregated/context.go
+++ b/test/acceptance/steps/aggregated/context.go
@@ -23,7 +23,7 @@ import (
 // ContextKey defines a type to store the aggregated session in context.Context.
 type ContextKey string
 
-var contextKey ContextKey = "aggregatedSession"
+const contextKey ContextKey = "aggregatedSession"
 
 // InitializeContext adds the Aggregated session to the context.
 // The new context is returned because context is immutable.
diff --git a/test/acceptance/steps/aggregated/context_test.go b/test/acceptance/steps/aggregated/context_test.go
index 24803e80..93b5f804 100644
--- a/test/acceptance/steps/aggregated/context_test.go
+++ b/test/acceptance/steps/aggregated/context_test.go
@@ -10,7 +10,6 @@ import (
 )
 
 func TestInitializeContext(t *testing.T) {
-
 	var ctx = context.Background()
 	var contextKeyValue = "aggregatedSession"
 	sharedContext := shared.InitializeContext(ctx)
diff --git a/test/acceptance/steps/shared/context.go b/test/acceptance/steps/shared/context.go
index 41de07ab..df8b36a6 100755
--- a/test/acceptance/steps/shared/context.go
+++ b/test/acceptance/steps/shared/context.go
@@ -21,13 +21,12 @@ import (
 // ContextKey defines a type to store the shared session in context.Context.
 type ContextKey string
 
-var contextKey ContextKey = "sharedSession"
+const contextKey ContextKey = "sharedSession"
 
 // InitializeContext adds the shared session to the context.
 // The new context is returned because context is immutable.
 func InitializeContext(ctx context.Context) context.Context {
-	var session Session
-	return context.WithValue(ctx, contextKey, &session)
+	return context.WithValue(ctx, contextKey, &Session{})
 }
 
 // GetSession returns the shared session stored in context.