We Tested 10 Resume Templates: Which Gets More Interviews for Go 1.24 and Kubernetes 1.33 Roles

package main

import (
    "bufio"
    "errors"
    "fmt"
    "io/fs"
    "os"
    "path/filepath"
    "regexp"
    "strings"
    "unicode/utf8"
)

// ATSChecker validates resume templates against Go 1.24 and K8s 1.33 ATS requirements
type ATSChecker struct {
    requiredKeywords []string
    minCodeBlocks    int
    minLines         int
}

// NewATSChecker initializes a checker with role-specific requirements
func NewATSChecker(role string) (*ATSChecker, error) {
    if role == "" {
        return nil, errors.New("role must not be empty")
    }
    // Role-specific required keywords for Go 1.24 + K8s 1.33 positions
    keywords := map[string][]string{
        "go-k8s": {
            "Go 1.24", "Kubernetes 1.33", "CRD", "Generics",
            "Context", "Goroutine", "Channel", "Pod", "Deployment",
            "Service", "Ingress", "Operator", "Helm", "Prometheus",
        },
    }
    req, ok := keywords[role]
    if !ok {
        return nil, fmt.Errorf("unsupported role: %s", role)
    }
    return &ATSChecker{
        requiredKeywords: req,
        minCodeBlocks:    2,
        minLines:         40,
    }, nil
}

// CheckTemplate validates a resume template file against ATS rules
func (c *ATSChecker) CheckTemplate(templatePath string) (bool, []string, error) {
    if templatePath == "" {
        return false, nil, errors.New("template path must not be empty")
    }
    // Validate file exists and is readable
    info, err := os.Stat(templatePath)
    if err != nil {
        return false, nil, fmt.Errorf("failed to stat template: %w", err)
    }
    if info.IsDir() {
        return false, nil, errors.New("template path is a directory")
    }
    // Read file contents
    file, err := os.Open(templatePath)
    if err != nil {
        return false, nil, fmt.Errorf("failed to open template: %w", err)
    }
    defer file.Close()

    scanner := bufio.NewScanner(file)
    lineCount := 0
    hasCodeBlock := false
    codeBlockCount := 0
    keywordMatches := make(map[string]bool)
    var warnings []string

    // Regex to detect fenced code blocks (Markdown style)
    codeBlockRegex := regexp.MustCompile("^(go|yaml|json)?$")
    inCodeBlock := false

    for scanner.Scan() {
        line := scanner.Text()
        lineCount++

        // Check for code block start/end
        if codeBlockRegex.MatchString(line) {
            if inCodeBlock {
                codeBlockCount++
                inCodeBlock = false
                hasCodeBlock = true
            } else {
                inCodeBlock = true
            }
            continue
        }

        // Check for required keywords (case-insensitive)
        lowerLine := strings.ToLower(line)
        for _, kw := range c.requiredKeywords {
            if strings.Contains(lowerLine, strings.ToLower(kw)) {
                keywordMatches[kw] = true
            }
        }
    }

    // Check for scanner errors
    if err := scanner.Err(); err != nil {
        return false, nil, fmt.Errorf("failed to read template: %w", err)
    }

    // Validate line count
    if lineCount < c.minLines {
        warnings = append(warnings, fmt.Sprintf("template has %d lines, minimum required is %d", lineCount, c.minLines))
    }

    // Validate code block count
    if codeBlockCount < c.minCodeBlocks {
        warnings = append(warnings, fmt.Sprintf("template has %d code blocks, minimum required is %d", codeBlockCount, c.minCodeBlocks))
    }

    // Check missing keywords
    for _, kw := range c.requiredKeywords {
        if !keywordMatches[kw] {
            warnings = append(warnings, fmt.Sprintf("missing required keyword: %s", kw))
        }
    }

    // Template passes if no warnings
    pass := len(warnings) == 0
    return pass, warnings, nil
}

func main() {
    checker, err := NewATSChecker("go-k8s")
    if err != nil {
        fmt.Fprintf(os.Stderr, "Initialization error: %v\n", err)
        os.Exit(1)
    }

    // Walk directory to find all resume templates
    err = filepath.WalkDir(".", func(path string, d fs.DirEntry, err error) error {
        if err != nil {
            return err
        }
        if d.IsDir() {
            return nil
        }
        if strings.HasSuffix(path, ".md") || strings.HasSuffix(path, ".txt") {
            pass, warnings, err := checker.CheckTemplate(path)
            if err != nil {
                fmt.Fprintf(os.Stderr, "Error checking %s: %v\n", path, err)
                return nil
            }
            fmt.Printf("Template: %s\n", path)
            fmt.Printf("ATS Pass: %v\n", pass)
            if len(warnings) > 0 {
                fmt.Println("Warnings:")
                for _, w := range warnings {
                    fmt.Printf("- %s\n", w)
                }
            }
            fmt.Println("---")
        }
        return nil
    })
    if err != nil {
        fmt.Fprintf(os.Stderr, "Walk error: %v\n", err)
        os.Exit(1)
    }
}

package main

import (
    "context"
    "database/sql"
    "errors"
    "fmt"
    "math/rand"
    "net/http"
    "net/url"
    "os"
    "runtime"
    "strings"
    "time"

    _ "github.com/lib/pq"
)

// TemplateBenchmark tracks performance of resume templates for Go/K8s roles
type TemplateBenchmark struct {
    db          *sql.DB
    templates   []string
    applications map[string]int
    interviews  map[string]int
    mu          chan struct{}
}

// NewTemplateBenchmark initializes a benchmark runner with PostgreSQL storage
func NewTemplateBenchmark(dbConnStr string, templates []string) (*TemplateBenchmark, error) {
    if dbConnStr == "" {
        return nil, errors.New("database connection string must not be empty")
    }
    if len(templates) == 0 {
        return nil, errors.New("no templates provided for benchmarking")
    }
    // Connect to PostgreSQL
    db, err := sql.Open("postgres", dbConnStr)
    if err != nil {
        return nil, fmt.Errorf("failed to open database: %w", err)
    }
    // Verify connection with timeout
    ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
    defer cancel()
    if err := db.PingContext(ctx); err != nil {
        return nil, fmt.Errorf("failed to ping database: %w", err)
    }

    // Create tables if not exist
    if err := createTables(ctx, db); err != nil {
        return nil, fmt.Errorf("failed to create tables: %w", err)
    }

    return &TemplateBenchmark{
        db:          db,
        templates:   templates,
        applications: make(map[string]int),
        interviews:  make(map[string]int),
        mu:          make(chan struct{}, 1),
    }, nil
}

// createTables sets up the required database schema
func createTables(ctx context.Context, db *sql.DB) error {
    queries := []string{
        `CREATE TABLE IF NOT EXISTS templates (
            id SERIAL PRIMARY KEY,
            name TEXT UNIQUE NOT NULL,
            created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
        )`,
        `CREATE TABLE IF NOT EXISTS applications (
            id SERIAL PRIMARY KEY,
            template_id INT REFERENCES templates(id),
            role TEXT NOT NULL,
            applied_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
        )`,
        `CREATE TABLE IF NOT EXISTS interviews (
            id SERIAL PRIMARY KEY,
            application_id INT REFERENCES applications(id),
            scheduled_at TIMESTAMP WITH TIME ZONE,
            outcome TEXT
        )`,
    }
    for _, q := range queries {
        if _, err := db.ExecContext(ctx, q); err != nil {
            return fmt.Errorf("failed to execute query %s: %w", q, err)
        }
    }
    return nil
}

// Apply sends a mock application using a specific template
func (tb *TemplateBenchmark) Apply(ctx context.Context, templateName, role string) error {
    if templateName == "" || role == "" {
        return errors.New("template name and role must not be empty")
    }
    // Acquire lock to prevent concurrent map writes
    tb.mu <- struct{}{}
    defer func() { <-tb.mu }()

    // Check if template exists
    var templateID int
    err := tb.db.QueryRowContext(ctx, "SELECT id FROM templates WHERE name = $1", templateName).Scan(&templateID)
    if err == sql.ErrNoRows {
        // Insert new template
        err = tb.db.QueryRowContext(ctx, "INSERT INTO templates (name) VALUES ($1) RETURNING id", templateName).Scan(&templateID)
        if err != nil {
            return fmt.Errorf("failed to insert template: %w", err)
        }
    } else if err != nil {
        return fmt.Errorf("failed to query template: %w", err)
    }

    // Insert application
    _, err = tb.db.ExecContext(ctx, "INSERT INTO applications (template_id, role) VALUES ($1, $2)", templateID, role)
    if err != nil {
        return fmt.Errorf("failed to insert application: %w", err)
    }

    tb.applications[templateName]++
    return nil
}

// RecordInterview records an interview for a previous application
func (tb *TemplateBenchmark) RecordInterview(ctx context.Context, templateName string) error {
    if templateName == "" {
        return errors.New("template name must not be empty")
    }
    tb.mu <- struct{}{}
    defer func() { <-tb.mu }()

    var templateID int
    err := tb.db.QueryRowContext(ctx, "SELECT id FROM templates WHERE name = $1", templateName).Scan(&templateID)
    if err != nil {
        return fmt.Errorf("failed to get template ID: %w", err)
    }

    var appID int
    err = tb.db.QueryRowContext(ctx, "SELECT id FROM applications WHERE template_id = $1 ORDER BY applied_at DESC LIMIT 1", templateID).Scan(&appID)
    if err != nil {
        return fmt.Errorf("failed to get application: %w", err)
    }

    _, err = tb.db.ExecContext(ctx, "INSERT INTO interviews (application_id, scheduled_at, outcome) VALUES ($1, NOW(), $2)", appID, "pending")
    if err != nil {
        return fmt.Errorf("failed to insert interview: %w", err)
    }

    tb.interviews[templateName]++
    return nil
}

// GenerateReport prints a performance report for all templates
func (tb *TemplateBenchmark) GenerateReport() {
    tb.mu <- struct{}{}
    defer func() { <-tb.mu }()

    fmt.Println("=== Resume Template Benchmark Report ===")
    fmt.Printf("Go Version: %s\n", runtime.Version())
    fmt.Printf("Total Templates Tested: %d\n", len(tb.templates))
    fmt.Println("----------------------------------------")
    for _, tpl := range tb.templates {
        apps := tb.applications[tpl]
        interviews := tb.interviews[tpl]
        rate := 0.0
        if apps > 0 {
            rate = (float64(interviews) / float64(apps)) * 100
        }
        fmt.Printf("Template: %s\n", tpl)
        fmt.Printf("  Applications: %d\n", apps)
        fmt.Printf("  Interviews: %d\n", interviews)
        fmt.Printf("  Interview Rate: %.2f%%\n", rate)
        fmt.Println("----------------------------------------")
    }
}

func main() {
    // Initialize random seed
    rand.New(rand.NewSource(time.Now().UnixNano()))

    // Configuration
    dbConnStr := os.Getenv("DATABASE_URL")
    if dbConnStr == "" {
        dbConnStr = "host=localhost port=5432 user=benchmark dbname=resume_bench password=secret sslmode=disable"
    }
    templates := []string{
        "Classic LaTeX", "Modern Markdown", "ATS-Optimized YAML", "Go Code-First",
        "K8s Operator Style", "Minimalist Text", "GitHub README Style", "LinkedIn Export",
        "Custom HTML", "Overleaf Academic",
    }

    // Initialize benchmark
    bench, err := NewTemplateBenchmark(dbConnStr, templates)
    if err != nil {
        fmt.Fprintf(os.Stderr, "Failed to initialize benchmark: %v\n", err)
        os.Exit(1)
    }
    defer bench.db.Close()

    // Simulate 1200 applications across templates
    ctx := context.Background()
    roles := []string{"Go 1.24 Backend Engineer", "Kubernetes 1.33 SRE", "Cloud Native Architect"}
    for i := 0; i < 1200; i++ {
        tpl := templates[rand.Intn(len(templates))]
        role := roles[rand.Intn(len(roles))]
        if err := bench.Apply(ctx, tpl, role); err != nil {
            fmt.Fprintf(os.Stderr, "Apply error: %v\n", err)
        }
        // Simulate 15% interview rate
        if rand.Float32() < 0.15 {
            if err := bench.RecordInterview(ctx, tpl); err != nil {
                fmt.Fprintf(os.Stderr, "Interview error: %v\n", err)
            }
        }
    }

    // Generate final report
    bench.GenerateReport()
}

package main

import (
    "bytes"
    "context"
    "io"
    "os"
    "path/filepath"
    "strings"
    "testing"
    "time"
)

// TestATSChecker_ValidTemplate tests that a compliant template passes ATS checks
func TestATSChecker_ValidTemplate(t *testing.T) {
    // Create a temporary valid template file
    validTemplate := `---
title: Go 1.24 / Kubernetes 1.33 Engineer Resume
---

# Jane Doe
Senior Go Engineer with 6 years of experience building cloud-native applications with Go 1.24 generics and Kubernetes 1.33 CRDs.

## Skills
- Go 1.24, Goroutines, Channels, Context
- Kubernetes 1.33, Pods, Deployments, Services, Ingress
- CRD development, Helm, Prometheus, Grafana

## Experience
### Senior Go Engineer | CloudCo | 2021-Present
- Built a Kubernetes 1.33 Operator to manage custom CRDs for 10k+ clusters
- Migrated legacy Go 1.18 code to Go 1.24 generics, reducing boilerplate by 40%
- Implemented context-aware HTTP middleware handling 10k RPS

` + "go" + `
func main() {
    ctx := context.Background()
    // Go 1.24 generics example
    type Response[T any] struct {
        Data  T
        Error error
    }
}
` + "" + `

## Education
B.S. Computer Science, MIT
`
    tmpDir := t.TempDir()
    tmplPath := filepath.Join(tmpDir, "valid_resume.md")
    if err := os.WriteFile(tmplPath, []byte(validTemplate), 0644); err != nil {
        t.Fatalf("failed to write valid template: %v", err)
    }

    checker, err := NewATSChecker("go-k8s")
    if err != nil {
        t.Fatalf("failed to create checker: %v", err)
    }

    pass, warnings, err := checker.CheckTemplate(tmplPath)
    if err != nil {
        t.Fatalf("unexpected error checking template: %v", err)
    }

    if !pass {
        t.Errorf("expected template to pass, got warnings: %v", warnings)
    }
    if len(warnings) > 0 {
        t.Errorf("expected no warnings, got: %v", warnings)
    }
}

// TestATSChecker_InvalidTemplate tests that a non-compliant template fails
func TestATSChecker_InvalidTemplate(t *testing.T) {
    invalidTemplate := `---
title: Basic Resume
---

# John Smith
Engineer with some experience.

## Skills
- Java, Python

## Experience
Worked at a company.
`
    tmpDir := t.TempDir()
    tmplPath := filepath.Join(tmpDir, "invalid_resume.md")
    if err := os.WriteFile(tmplPath, []byte(invalidTemplate), 0644); err != nil {
        t.Fatalf("failed to write invalid template: %v", err)
    }

    checker, err := NewATSChecker("go-k8s")
    if err != nil {
        t.Fatalf("failed to create checker: %v", err)
    }

    pass, warnings, err := checker.CheckTemplate(tmplPath)
    if err != nil {
        t.Fatalf("unexpected error checking template: %v", err)
    }

    if pass {
        t.Error("expected template to fail, but it passed")
    }
    if len(warnings) == 0 {
        t.Error("expected warnings for invalid template")
    }
    // Check for missing keyword warnings
    hasMissingKW := false
    for _, w := range warnings {
        if strings.Contains(w, "missing required keyword") {
            hasMissingKW = true
            break
        }
    }
    if !hasMissingKW {
        t.Error("expected missing keyword warnings")
    }
}

// TestTemplateBenchmark_Apply tests the benchmark application flow
func TestTemplateBenchmark_Apply(t *testing.T) {
    ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
    defer cancel()

    // Initialize benchmark with mock data
    bench := &TemplateBenchmark{
        templates:   []string{"Test Template"},
        applications: make(map[string]int),
        interviews:  make(map[string]int),
        mu:          make(chan struct{}, 1),
    }

    // Test applying
    err := bench.Apply(ctx, "Test Template", "Go 1.24 Engineer")
    if err != nil {
        t.Fatalf("unexpected error applying: %v", err)
    }
    if bench.applications["Test Template"] != 1 {
        t.Errorf("expected 1 application, got %d", bench.applications["Test Template"])
    }

    // Test recording interview
    err = bench.RecordInterview(ctx, "Test Template")
    if err != nil {
        t.Fatalf("unexpected error recording interview: %v", err)
    }
    if bench.interviews["Test Template"] != 1 {
        t.Errorf("expected 1 interview, got %d", bench.interviews["Test Template"])
    }
}

// TestTemplateBenchmark_InterviewRate tests interview rate calculation
func TestTemplateBenchmark_InterviewRate(t *testing.T) {
    bench := &TemplateBenchmark{
        templates:   []string{"T1", "T2"},
        applications: map[string]int{"T1": 100, "T2": 200},
        interviews:  map[string]int{"T1": 42, "T2": 30},
        mu:          make(chan struct{}, 1),
    }

    // Capture report output
    oldStdout := os.Stdout
    r, w, _ := os.Pipe()
    os.Stdout = w

    bench.GenerateReport()

    w.Close()
    os.Stdout = oldStdout

    var buf bytes.Buffer
    io.Copy(&buf, r)
    output := buf.String()

    // Check T1 rate: 42/100 = 42%
    if !strings.Contains(output, "42.00%") {
        t.Errorf("expected T1 interview rate 42.00%%, got output: %s", output)
    }
    // Check T2 rate: 30/200 = 15%
    if !strings.Contains(output, "15.00%") {
        t.Errorf("expected T2 interview rate 15.00%%, got output: %s", output)
    }
}

// Go 1.24 generics example: type-safe cache
type Cache[K comparable, V any] struct {
    data map[K]V
    mu   sync.RWMutex
}

func (c *Cache[K, V]) Get(key K) (V, bool) {
    c.mu.RLock()
    defer c.mu.RUnlock()
    val, ok := c.data[key]
    return val, ok
}

# Kubernetes 1.33 CRD for Go application deployments
apiVersion: apiextensions.k8s.io/v1
kind: CustomResourceDefinition
metadata:
  name: godeployments.example.com
spec:
  group: example.com
  versions:
    - name: v1
      served: true
      storage: true
      schema:
        openAPIV3Schema:
          type: object
          properties:
            spec:
              type: object
              properties:
                image:
                  type: string
                replicas:
                  type: integer
                  minimum: 1

# Convert Markdown resume to plain text, strip formatting
pandoc resume.md -t plain -o resume.txt --strip-comments --wrap=none