diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index cde7250..5207bf6 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -7,7 +7,7 @@ on:
     branches: [ main ]
 
 jobs:
-  build:
+  lint:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
diff --git a/README.md b/README.md
index 71b2d43..8bdc515 100644
--- a/README.md
+++ b/README.md
@@ -5,3 +5,7 @@
 </a>
 
 Repogen is a code generator for database repository in Golang. (WIP)
+
+## Features
+
+Repogen is a library that generates MongoDB repository implementation from repository interface by using method name pattern.
diff --git a/internal/mongo/generator.go b/internal/mongo/generator.go
index b3e43ea..3b9e705 100644
--- a/internal/mongo/generator.go
+++ b/internal/mongo/generator.go
@@ -120,24 +120,24 @@ func (g mongoRepositoryGenerator) generateMethodImplementation(methodSpec spec.M
 func (g mongoRepositoryGenerator) generateFindImplementation(operation spec.FindOperation) (string, error) {
 	buffer := new(bytes.Buffer)
 
-	var queryFields []string
-	for _, fieldName := range operation.Query.Fields {
-		structField, ok := g.StructModel.Fields.ByName(fieldName)
+	var predicates []predicate
+	for _, predicateSpec := range operation.Query.Predicates {
+		structField, ok := g.StructModel.Fields.ByName(predicateSpec.Field)
 		if !ok {
-			return "", fmt.Errorf("struct field %s not found", fieldName)
+			return "", fmt.Errorf("struct field %s not found", predicateSpec.Field)
 		}
 
 		bsonTag, ok := structField.Tags["bson"]
 		if !ok {
-			return "", fmt.Errorf("struct field %s does not have bson tag", fieldName)
+			return "", fmt.Errorf("struct field %s does not have bson tag", predicateSpec.Field)
 		}
 
-		queryFields = append(queryFields, bsonTag[0])
+		predicates = append(predicates, predicate{Field: bsonTag[0], Operator: predicateSpec.Operator})
 	}
 
 	tmplData := mongoFindTemplateData{
-		EntityType:  g.StructModel.Name,
-		QueryFields: queryFields,
+		EntityType: g.StructModel.Name,
+		Predicates: predicates,
 	}
 
 	if operation.Mode == spec.QueryModeOne {
diff --git a/internal/mongo/generator_test.go b/internal/mongo/generator_test.go
index 0a77702..87e1486 100644
--- a/internal/mongo/generator_test.go
+++ b/internal/mongo/generator_test.go
@@ -22,6 +22,16 @@ func TestGenerateMongoRepository(t *testing.T) {
 				Type: code.SimpleType("string"),
 				Tags: map[string][]string{"bson": {"username"}},
 			},
+			{
+				Name: "Gender",
+				Type: code.SimpleType("Gender"),
+				Tags: map[string][]string{"bson": {"gender"}},
+			},
+			{
+				Name: "Age",
+				Type: code.SimpleType("int"),
+				Tags: map[string][]string{"bson": {"age"}},
+			},
 		},
 	}
 	intf := code.Interface{
@@ -69,6 +79,61 @@ func TestGenerateMongoRepository(t *testing.T) {
 					code.SimpleType("error"),
 				},
 			},
+			{
+				Name: "FindByGenderNot",
+				Params: []code.Param{
+					{Name: "ctx", Type: code.ExternalType{PackageAlias: "context", Name: "Context"}},
+					{Name: "gender", Type: code.SimpleType("int")},
+				},
+				Returns: []code.Type{
+					code.ArrayType{ContainedType: code.PointerType{ContainedType: code.SimpleType("UserModel")}},
+					code.SimpleType("error"),
+				},
+			},
+			{
+				Name: "FindByAgeLessThan",
+				Params: []code.Param{
+					{Name: "ctx", Type: code.ExternalType{PackageAlias: "context", Name: "Context"}},
+					{Name: "age", Type: code.SimpleType("int")},
+				},
+				Returns: []code.Type{
+					code.ArrayType{ContainedType: code.PointerType{ContainedType: code.SimpleType("UserModel")}},
+					code.SimpleType("error"),
+				},
+			},
+			{
+				Name: "FindByAgeLessThanEqual",
+				Params: []code.Param{
+					{Name: "ctx", Type: code.ExternalType{PackageAlias: "context", Name: "Context"}},
+					{Name: "age", Type: code.SimpleType("int")},
+				},
+				Returns: []code.Type{
+					code.ArrayType{ContainedType: code.PointerType{ContainedType: code.SimpleType("UserModel")}},
+					code.SimpleType("error"),
+				},
+			},
+			{
+				Name: "FindByAgeGreaterThan",
+				Params: []code.Param{
+					{Name: "ctx", Type: code.ExternalType{PackageAlias: "context", Name: "Context"}},
+					{Name: "age", Type: code.SimpleType("int")},
+				},
+				Returns: []code.Type{
+					code.ArrayType{ContainedType: code.PointerType{ContainedType: code.SimpleType("UserModel")}},
+					code.SimpleType("error"),
+				},
+			},
+			{
+				Name: "FindByAgeGreaterThanEqual",
+				Params: []code.Param{
+					{Name: "ctx", Type: code.ExternalType{PackageAlias: "context", Name: "Context"}},
+					{Name: "age", Type: code.SimpleType("int")},
+				},
+				Returns: []code.Type{
+					code.ArrayType{ContainedType: code.PointerType{ContainedType: code.SimpleType("UserModel")}},
+					code.SimpleType("error"),
+				},
+			},
 		},
 	}
 
@@ -142,6 +207,76 @@ func (r *UserRepositoryMongo) FindByIDAndUsername(ctx context.Context, arg0 prim
 	}
 	return &entity, nil
 }
+
+func (r *UserRepositoryMongo) FindByGenderNot(ctx context.Context, arg0 int) ([]*UserModel, error) {
+	cursor, err := r.collection.Find(ctx, bson.M{
+		"gender": bson.M{"$ne": arg0},
+	})
+	if err != nil {
+		return nil, err
+	}
+	var entities []*UserModel
+	if err := cursor.All(ctx, &entities); err != nil {
+		return nil, err
+	}
+	return entities, nil
+}
+
+func (r *UserRepositoryMongo) FindByAgeLessThan(ctx context.Context, arg0 int) ([]*UserModel, error) {
+	cursor, err := r.collection.Find(ctx, bson.M{
+		"age": bson.M{"$lt": arg0},
+	})
+	if err != nil {
+		return nil, err
+	}
+	var entities []*UserModel
+	if err := cursor.All(ctx, &entities); err != nil {
+		return nil, err
+	}
+	return entities, nil
+}
+
+func (r *UserRepositoryMongo) FindByAgeLessThanEqual(ctx context.Context, arg0 int) ([]*UserModel, error) {
+	cursor, err := r.collection.Find(ctx, bson.M{
+		"age": bson.M{"$lte": arg0},
+	})
+	if err != nil {
+		return nil, err
+	}
+	var entities []*UserModel
+	if err := cursor.All(ctx, &entities); err != nil {
+		return nil, err
+	}
+	return entities, nil
+}
+
+func (r *UserRepositoryMongo) FindByAgeGreaterThan(ctx context.Context, arg0 int) ([]*UserModel, error) {
+	cursor, err := r.collection.Find(ctx, bson.M{
+		"age": bson.M{"$gt": arg0},
+	})
+	if err != nil {
+		return nil, err
+	}
+	var entities []*UserModel
+	if err := cursor.All(ctx, &entities); err != nil {
+		return nil, err
+	}
+	return entities, nil
+}
+
+func (r *UserRepositoryMongo) FindByAgeGreaterThanEqual(ctx context.Context, arg0 int) ([]*UserModel, error) {
+	cursor, err := r.collection.Find(ctx, bson.M{
+		"age": bson.M{"$gte": arg0},
+	})
+	if err != nil {
+		return nil, err
+	}
+	var entities []*UserModel
+	if err := cursor.All(ctx, &entities); err != nil {
+		return nil, err
+	}
+	return entities, nil
+}
 `
 	expectedCodeLines := strings.Split(expectedCode, "\n")
 	actualCodeLines := strings.Split(code, "\n")
diff --git a/internal/mongo/models.go b/internal/mongo/models.go
new file mode 100644
index 0000000..ca07421
--- /dev/null
+++ b/internal/mongo/models.go
@@ -0,0 +1,30 @@
+package mongo
+
+import (
+	"fmt"
+
+	"github.com/sunboyy/repogen/internal/spec"
+)
+
+type predicate struct {
+	Field    string
+	Operator spec.Operator
+}
+
+func (p predicate) Code(argIndex int) string {
+	switch p.Operator {
+	case spec.OperatorEqual:
+		return fmt.Sprintf(`"%s": arg%d`, p.Field, argIndex)
+	case spec.OperatorNot:
+		return fmt.Sprintf(`"%s": bson.M{"$ne": arg%d}`, p.Field, argIndex)
+	case spec.OperatorLessThan:
+		return fmt.Sprintf(`"%s": bson.M{"$lt": arg%d}`, p.Field, argIndex)
+	case spec.OperatorLessThanEqual:
+		return fmt.Sprintf(`"%s": bson.M{"$lte": arg%d}`, p.Field, argIndex)
+	case spec.OperatorGreaterThan:
+		return fmt.Sprintf(`"%s": bson.M{"$gt": arg%d}`, p.Field, argIndex)
+	case spec.OperatorGreaterThanEqual:
+		return fmt.Sprintf(`"%s": bson.M{"$gte": arg%d}`, p.Field, argIndex)
+	}
+	return ""
+}
diff --git a/internal/mongo/templates.go b/internal/mongo/templates.go
index 41b10cf..e421a61 100644
--- a/internal/mongo/templates.go
+++ b/internal/mongo/templates.go
@@ -75,19 +75,19 @@ func (data mongoMethodTemplateData) Returns() string {
 
 const findOneTemplate = `	var entity {{.EntityType}}
 	if err := r.collection.FindOne(ctx, bson.M{
-{{range $index, $field := .QueryFields}}		"{{$field}}": arg{{$index}},
+{{range $index, $field := .Predicates}}		{{$field.Code $index}},
 {{end}}	}).Decode(&entity); err != nil {
 		return nil, err
 	}
 	return &entity, nil`
 
 type mongoFindTemplateData struct {
-	EntityType  string
-	QueryFields []string
+	EntityType string
+	Predicates []predicate
 }
 
 const findManyTemplate = `	cursor, err := r.collection.Find(ctx, bson.M{
-{{range $index, $field := .QueryFields}}		"{{$field}}": arg{{$index}},
+{{range $index, $field := .Predicates}}		{{$field.Code $index}},
 {{end}}	})
 	if err != nil {
 		return nil, err
diff --git a/internal/spec/models.go b/internal/spec/models.go
index 171e3bd..15b4696 100644
--- a/internal/spec/models.go
+++ b/internal/spec/models.go
@@ -1,6 +1,10 @@
 package spec
 
-import "github.com/sunboyy/repogen/internal/code"
+import (
+	"strings"
+
+	"github.com/sunboyy/repogen/internal/code"
+)
 
 // QueryMode one or many
 type QueryMode string
@@ -35,12 +39,52 @@ type FindOperation struct {
 	Query QuerySpec
 }
 
-// QuerySpec is a condition of querying the database
+// QuerySpec is a set of conditions of querying the database
 type QuerySpec struct {
-	Fields []string
+	Predicates []Predicate
 }
 
 // NumberOfArguments returns number of arguments required to perform the query
 func (q QuerySpec) NumberOfArguments() int {
-	return len(q.Fields)
+	return len(q.Predicates)
+}
+
+// Operator is an operator of the condition to query the data
+type Operator string
+
+// operator constants
+const (
+	OperatorEqual            Operator = "EQUAL"
+	OperatorNot              Operator = "NOT"
+	OperatorLessThan         Operator = "LESS_THAN"
+	OperatorLessThanEqual    Operator = "LESS_THAN_EQUAL"
+	OperatorGreaterThan      Operator = "GREATER_THAN"
+	OperatorGreaterThanEqual Operator = "GREATER_THAN_EQUAL"
+)
+
+// Predicate is a criteria for querying a field
+type Predicate struct {
+	Field    string
+	Operator Operator
+}
+
+type predicateToken []string
+
+func (t predicateToken) ToPredicate() Predicate {
+	if len(t) > 1 && t[len(t)-1] == "Not" {
+		return Predicate{Field: strings.Join(t[:len(t)-1], ""), Operator: OperatorNot}
+	}
+	if len(t) > 2 && t[len(t)-2] == "Less" && t[len(t)-1] == "Than" {
+		return Predicate{Field: strings.Join(t[:len(t)-2], ""), Operator: OperatorLessThan}
+	}
+	if len(t) > 3 && t[len(t)-3] == "Less" && t[len(t)-2] == "Than" && t[len(t)-1] == "Equal" {
+		return Predicate{Field: strings.Join(t[:len(t)-3], ""), Operator: OperatorLessThanEqual}
+	}
+	if len(t) > 2 && t[len(t)-2] == "Greater" && t[len(t)-1] == "Than" {
+		return Predicate{Field: strings.Join(t[:len(t)-2], ""), Operator: OperatorGreaterThan}
+	}
+	if len(t) > 3 && t[len(t)-3] == "Greater" && t[len(t)-2] == "Than" && t[len(t)-1] == "Equal" {
+		return Predicate{Field: strings.Join(t[:len(t)-3], ""), Operator: OperatorGreaterThanEqual}
+	}
+	return Predicate{Field: strings.Join(t, ""), Operator: OperatorEqual}
 }
diff --git a/internal/spec/parser.go b/internal/spec/parser.go
index d08642c..ce6afd0 100644
--- a/internal/spec/parser.go
+++ b/internal/spec/parser.go
@@ -130,20 +130,21 @@ func (p repositoryInterfaceParser) parseQuery(tokens []string) (QuerySpec, error
 	if tokens[0] == "And" {
 		return QuerySpec{}, errors.New("method name not supported")
 	}
-	var queryFields []string
-	var aggregatedToken string
+
+	var predicates []Predicate
+	var aggregatedToken predicateToken
 	for _, token := range tokens {
 		if token != "And" {
-			aggregatedToken += token
+			aggregatedToken = append(aggregatedToken, token)
 		} else {
-			queryFields = append(queryFields, aggregatedToken)
-			aggregatedToken = ""
+			predicates = append(predicates, aggregatedToken.ToPredicate())
+			aggregatedToken = predicateToken{}
 		}
 	}
-	if aggregatedToken == "" {
+	if len(aggregatedToken) == 0 {
 		return QuerySpec{}, errors.New("method name not supported")
 	}
-	queryFields = append(queryFields, aggregatedToken)
+	predicates = append(predicates, aggregatedToken.ToPredicate())
 
-	return QuerySpec{Fields: queryFields}, nil
+	return QuerySpec{Predicates: predicates}, nil
 }
diff --git a/internal/spec/parser_test.go b/internal/spec/parser_test.go
index d5a5f9a..0aeba9a 100644
--- a/internal/spec/parser_test.go
+++ b/internal/spec/parser_test.go
@@ -57,8 +57,10 @@ func TestParseRepositoryInterface(t *testing.T) {
 							code.SimpleType("error"),
 						},
 						Operation: spec.FindOperation{
-							Mode:  spec.QueryModeOne,
-							Query: spec.QuerySpec{Fields: []string{"ID"}},
+							Mode: spec.QueryModeOne,
+							Query: spec.QuerySpec{Predicates: []spec.Predicate{
+								{Field: "ID", Operator: spec.OperatorEqual},
+							}},
 						},
 					},
 				},
@@ -96,9 +98,10 @@ func TestParseRepositoryInterface(t *testing.T) {
 							code.SimpleType("error"),
 						},
 						Operation: spec.FindOperation{
-
-							Mode:  spec.QueryModeOne,
-							Query: spec.QuerySpec{Fields: []string{"PhoneNumber"}},
+							Mode: spec.QueryModeOne,
+							Query: spec.QuerySpec{Predicates: []spec.Predicate{
+								{Field: "PhoneNumber", Operator: spec.OperatorEqual},
+							}},
 						},
 					},
 				},
@@ -136,8 +139,10 @@ func TestParseRepositoryInterface(t *testing.T) {
 							code.SimpleType("error"),
 						},
 						Operation: spec.FindOperation{
-							Mode:  spec.QueryModeMany,
-							Query: spec.QuerySpec{Fields: []string{"City"}},
+							Mode: spec.QueryModeMany,
+							Query: spec.QuerySpec{Predicates: []spec.Predicate{
+								{Field: "City", Operator: spec.OperatorEqual},
+							}},
 						},
 					},
 				},
@@ -213,8 +218,216 @@ func TestParseRepositoryInterface(t *testing.T) {
 							code.SimpleType("error"),
 						},
 						Operation: spec.FindOperation{
-							Mode:  spec.QueryModeMany,
-							Query: spec.QuerySpec{Fields: []string{"City", "Gender"}},
+							Mode: spec.QueryModeMany,
+							Query: spec.QuerySpec{Predicates: []spec.Predicate{
+								{Field: "City", Operator: spec.OperatorEqual},
+								{Field: "Gender", Operator: spec.OperatorEqual},
+							}},
+						},
+					},
+				},
+			},
+		},
+		{
+			Name: "FindByArgNot method",
+			Interface: code.Interface{
+				Name: "UserRepository",
+				Methods: []code.Method{
+					{
+						Name: "FindByCityNot",
+						Params: []code.Param{
+							{Type: code.ExternalType{PackageAlias: "context", Name: "Context"}},
+							{Type: code.SimpleType("string")},
+						},
+						Returns: []code.Type{
+							code.ArrayType{ContainedType: code.PointerType{ContainedType: code.SimpleType("UserModel")}},
+							code.SimpleType("error"),
+						},
+					},
+				},
+			},
+			ExpectedOutput: spec.RepositorySpec{
+				InterfaceName: "UserRepository",
+				Methods: []spec.MethodSpec{
+					{
+						Name: "FindByCityNot",
+						Params: []code.Param{
+							{Type: code.ExternalType{PackageAlias: "context", Name: "Context"}},
+							{Type: code.SimpleType("string")},
+						},
+						Returns: []code.Type{
+							code.ArrayType{ContainedType: code.PointerType{ContainedType: code.SimpleType("UserModel")}},
+							code.SimpleType("error"),
+						},
+						Operation: spec.FindOperation{
+							Mode: spec.QueryModeMany,
+							Query: spec.QuerySpec{Predicates: []spec.Predicate{
+								{Field: "City", Operator: spec.OperatorNot},
+							}},
+						},
+					},
+				},
+			},
+		},
+		{
+			Name: "FindByArgLessThan method",
+			Interface: code.Interface{
+				Name: "UserRepository",
+				Methods: []code.Method{
+					{
+						Name: "FindByAgeLessThan",
+						Params: []code.Param{
+							{Type: code.ExternalType{PackageAlias: "context", Name: "Context"}},
+							{Type: code.SimpleType("string")},
+						},
+						Returns: []code.Type{
+							code.ArrayType{ContainedType: code.PointerType{ContainedType: code.SimpleType("UserModel")}},
+							code.SimpleType("error"),
+						},
+					},
+				},
+			},
+			ExpectedOutput: spec.RepositorySpec{
+				InterfaceName: "UserRepository",
+				Methods: []spec.MethodSpec{
+					{
+						Name: "FindByAgeLessThan",
+						Params: []code.Param{
+							{Type: code.ExternalType{PackageAlias: "context", Name: "Context"}},
+							{Type: code.SimpleType("string")},
+						},
+						Returns: []code.Type{
+							code.ArrayType{ContainedType: code.PointerType{ContainedType: code.SimpleType("UserModel")}},
+							code.SimpleType("error"),
+						},
+						Operation: spec.FindOperation{
+							Mode: spec.QueryModeMany,
+							Query: spec.QuerySpec{Predicates: []spec.Predicate{
+								{Field: "Age", Operator: spec.OperatorLessThan},
+							}},
+						},
+					},
+				},
+			},
+		},
+		{
+			Name: "FindByArgLessThanEqual method",
+			Interface: code.Interface{
+				Name: "UserRepository",
+				Methods: []code.Method{
+					{
+						Name: "FindByAgeLessThanEqual",
+						Params: []code.Param{
+							{Type: code.ExternalType{PackageAlias: "context", Name: "Context"}},
+							{Type: code.SimpleType("string")},
+						},
+						Returns: []code.Type{
+							code.ArrayType{ContainedType: code.PointerType{ContainedType: code.SimpleType("UserModel")}},
+							code.SimpleType("error"),
+						},
+					},
+				},
+			},
+			ExpectedOutput: spec.RepositorySpec{
+				InterfaceName: "UserRepository",
+				Methods: []spec.MethodSpec{
+					{
+						Name: "FindByAgeLessThanEqual",
+						Params: []code.Param{
+							{Type: code.ExternalType{PackageAlias: "context", Name: "Context"}},
+							{Type: code.SimpleType("string")},
+						},
+						Returns: []code.Type{
+							code.ArrayType{ContainedType: code.PointerType{ContainedType: code.SimpleType("UserModel")}},
+							code.SimpleType("error"),
+						},
+						Operation: spec.FindOperation{
+							Mode: spec.QueryModeMany,
+							Query: spec.QuerySpec{Predicates: []spec.Predicate{
+								{Field: "Age", Operator: spec.OperatorLessThanEqual},
+							}},
+						},
+					},
+				},
+			},
+		},
+		{
+			Name: "FindByArgGreaterThan method",
+			Interface: code.Interface{
+				Name: "UserRepository",
+				Methods: []code.Method{
+					{
+						Name: "FindByAgeGreaterThan",
+						Params: []code.Param{
+							{Type: code.ExternalType{PackageAlias: "context", Name: "Context"}},
+							{Type: code.SimpleType("string")},
+						},
+						Returns: []code.Type{
+							code.ArrayType{ContainedType: code.PointerType{ContainedType: code.SimpleType("UserModel")}},
+							code.SimpleType("error"),
+						},
+					},
+				},
+			},
+			ExpectedOutput: spec.RepositorySpec{
+				InterfaceName: "UserRepository",
+				Methods: []spec.MethodSpec{
+					{
+						Name: "FindByAgeGreaterThan",
+						Params: []code.Param{
+							{Type: code.ExternalType{PackageAlias: "context", Name: "Context"}},
+							{Type: code.SimpleType("string")},
+						},
+						Returns: []code.Type{
+							code.ArrayType{ContainedType: code.PointerType{ContainedType: code.SimpleType("UserModel")}},
+							code.SimpleType("error"),
+						},
+						Operation: spec.FindOperation{
+							Mode: spec.QueryModeMany,
+							Query: spec.QuerySpec{Predicates: []spec.Predicate{
+								{Field: "Age", Operator: spec.OperatorGreaterThan},
+							}},
+						},
+					},
+				},
+			},
+		},
+		{
+			Name: "FindByArgGreaterThanEqual method",
+			Interface: code.Interface{
+				Name: "UserRepository",
+				Methods: []code.Method{
+					{
+						Name: "FindByAgeGreaterThanEqual",
+						Params: []code.Param{
+							{Type: code.ExternalType{PackageAlias: "context", Name: "Context"}},
+							{Type: code.SimpleType("string")},
+						},
+						Returns: []code.Type{
+							code.ArrayType{ContainedType: code.PointerType{ContainedType: code.SimpleType("UserModel")}},
+							code.SimpleType("error"),
+						},
+					},
+				},
+			},
+			ExpectedOutput: spec.RepositorySpec{
+				InterfaceName: "UserRepository",
+				Methods: []spec.MethodSpec{
+					{
+						Name: "FindByAgeGreaterThanEqual",
+						Params: []code.Param{
+							{Type: code.ExternalType{PackageAlias: "context", Name: "Context"}},
+							{Type: code.SimpleType("string")},
+						},
+						Returns: []code.Type{
+							code.ArrayType{ContainedType: code.PointerType{ContainedType: code.SimpleType("UserModel")}},
+							code.SimpleType("error"),
+						},
+						Operation: spec.FindOperation{
+							Mode: spec.QueryModeMany,
+							Query: spec.QuerySpec{Predicates: []spec.Predicate{
+								{Field: "Age", Operator: spec.OperatorGreaterThanEqual},
+							}},
 						},
 					},
 				},
@@ -241,6 +454,10 @@ func TestParseRepositoryInterface(t *testing.T) {
 				Name: "City",
 				Type: code.SimpleType("string"),
 			},
+			{
+				Name: "Age",
+				Type: code.SimpleType("int"),
+			},
 		},
 	}