🚀 My Servicenow Frontend Engineer Interview Experience (2025) | Software Engineer [Frontend] IC2

Position: Software Engineer [Frontend] IC2
Location: Remote / India
Compensation: 💰 32 LPA Fixed + 10% Variable + ₹6-8L Stocks
Tech Stack: JavaScript, HTML, CSS, VanillaJS, ReactJS

🏢 About Servicenow

Servicenow is a global leader in digital workflow automation, helping enterprises streamline IT, employee, and customer operations. Known for its scalable cloud platform, it delivers efficient tools for ITSM, HR, and security workflows. With a strong focus on enterprise UX and frontend excellence, Servicenow actively hires engineers skilled in vanilla JS, React, and scalable UI design.

🔍 Overview of the Interview Process

🔥 Round 1: DSA + Machine Coding

✅ Problem-Solving: Sentence Arrangement by Word Length

Problem: When given a sentence, rearrange the words based on word length while preserving the sentence casing and punctuation.

💡 Solution:

function arrange(sentence) {
    // 📝 Remove the trailing punctuation and convert to lowercase
    let modifiedString = sentence.slice(0, -1)?.toLowerCase();

    // 🧩 Split the sentence into individual words
    let words = modifiedString.split(' ');

    // 📦 Group words by their length using a map
    let wordMap = {};

    for (let word of words) {
        let len = word.length;

        // 📚 If no array exists for this length, create one
        if (!wordMap[len]) wordMap[len] = [];

        // ➕ Add word to the corresponding length group
        wordMap[len].push(word);
    }

    // 📏 Sort the keys (word lengths) in ascending order
    let sortedKeys = Object.keys(wordMap).sort((a, b) => a - b);

    // 🔄 Flatten the words in the order of length using flatMap
    let result = sortedKeys.flatMap(len => wordMap[len]).join(' ');

    // ✨ Capitalize the first letter and add the punctuation
    return result.charAt(0).toUpperCase() + result.slice(1) + '.';
}

// ✅ Example usage
console.log(arrange("Is your code well structured and readable?"));
// Output: "Is and your code well structured readable."

📝 JavaScript Notes:

• slice(0, -1) ➝ removes the last character (punctuation).
• .toLowerCase() ➝ ensures uniform casing.
• Object.keys().sort() ➝ helps in ordering word lengths.
• .flatMap() ➝ flattens nested arrays into a single list.
• charAt(0).toUpperCase() ➝ capitalizes the first character.

🎮 Machine Coding: Pole Game UI (Design + Logic)

Task: Replicate the provided screenshot-based UI and implement logic for a pole game — likely involving progressive interactions or animations.

Since the image wasn't fully accessible, here's what this type of round typically evaluates:

Frontend Skills Tested:

• DOM manipulation
• CSS layouting
• Click-based interactivity
• Timer logic or conditional display

⚙️ Round 2: Machine Coding + Behavioral

✅ Behavioral Questions:

• Tell me about a frontend project you're proud of.
• What is the biggest challenge you’ve faced in your UI work?
• How do you handle code reviews and feedback?

💻 Task: To-Do App in Pure Vanilla JavaScript

Requirements:

• Add / Edit / Delete / Complete a task
• No framework or library

💡 ToDo App Code Sample (Simplified Version):

// 🚀 Class to manage tasks with add, toggle, and delete functionality
class TaskManager {
  constructor() {
    this.tasks = []; // 📦 Array to store task objects: { id, title, completed }
  }

  // ➕ Add a new task with a unique id
  addTask(title) {
    this.tasks.push({
      id: Date.now(), // 🆔 Unique timestamp-based ID
      title,
      completed: false
    });
  }

  // ✅ Toggle completion status of a task by ID
  toggleComplete(id) {
    this.tasks = this.tasks.map(task =>
      task.id === id
        ? { ...task, completed: !task.completed } // 🔁 Toggle 'completed'
        : task
    );
  }

  // ❌ Delete task by ID
  deleteTask(id) {
    this.tasks = this.tasks.filter(task => task.id !== id);
  }
}

// 🧠 Instantiate the TaskManager
const manager = new TaskManager();

// 🔍 Grab DOM elements
const taskInput = document.querySelector("#user_input");
const taskContainer = document.querySelector("#taskContainer");

// 🖼️ Render task list in UI
function renderTasks() {
  taskContainer.innerHTML = ''; // 🧹 Clear existing tasks

  manager.tasks.forEach(task => {
    const div = document.createElement("div");
    div.className = "taskItem";

    // 🧱 Create task UI with checkbox and delete button
    div.innerHTML = `
      <input type="checkbox" ${task.completed ? "checked" : ""} 
        onclick="toggleTask(${task.id})" />
      ${task.completed ? `<s>${task.title}</s>` : task.title} 
      <button onclick="deleteTask(${task.id})">❌</button>
    `;
    taskContainer.appendChild(div); // ➕ Add to DOM
  });
}

// 🆕 Add new task from input field
function addNewTask() {
  const title = taskInput.value.trim(); // ✂️ Remove extra spaces
  if (!title) return;

  manager.addTask(title);
  renderTasks(); // 🔄 Refresh the task list
  taskInput.value = ''; // 🔁 Reset input field
}

// 🔁 Toggle completion when checkbox is clicked
function toggleTask(id) {
  manager.toggleComplete(id);
  renderTasks();
}

// 🗑️ Remove task from the list
function deleteTask(id) {
  manager.deleteTask(id);
  renderTasks();
}

🔍 Key JavaScript Concepts:

• Classes & OOP: Structure your app using class TaskManager for better organization.
• Immutability: map and filter are used to avoid mutating the original task array.
• DOM Manipulation: Dynamically generate task elements and handle events via onclick.
• Data Binding Pattern: Manual refresh is used renderTasks() after every change to simulate reactivity.

✅ Enhancement Ideas:

• Add Edit Task ✏️ functionality.
• Persist data using localStorage.
• Highlight completed tasks with a strikethrough (<s>text</s>).
• Add priority tags or due dates.

🧱 Round 3: Frontend System Design – Autocomplete Component (40 mins)

This round focused on designing a scalable, modular, and highly performant Autocomplete UI component – a common challenge in frontend system design interviews.

✅ Key Discussion Points:

• Component Structure: How to break the Autocomplete into reusable subcomponents (Input, SuggestionsList, SuggestionItem).
• Performance Optimization: Debounce user input, caching suggestions, and handling API rate limits.
• State Management: Managing input state, loading states, and selected suggestions using useState or external state libraries.
• Accessibility (a11y): Supporting keyboard navigation (↑ ↓ Enter), screen reader roles.
• API Integration Strategy: Handling delayed responses, race conditions, and fallback strategies.
• RADIO Framework Approach: Emphasized Responsibilities, Architecture, Data flow, Interactions, and Optimizations.

🏗️Round 4: Hiring Manager Discussion – JavaScript Deep Dive + Projects

This was a comprehensive 1:1 session with the Hiring Manager, focused on past experience, real-world optimizations, and JavaScript fundamentals.

🧠 Project Discussion:

• Shared a passion project I built from scratch – discussed architectural decisions, scaling strategies, and design patterns used.

🚀 Performance & UX Optimization Topics:

• Code-Splitting: Using React.lazy() and dynamic import() to reduce initial bundle size.
• Memoization: Explained useMemo and useCallback usage for avoiding unnecessary re-renders.
• Lazy Loading: Use of IntersectionObserver API to load components/images only when visible.
• List Virtualization: Efficient rendering of large lists using libraries like react-window or react-virtualized.

📚 JavaScript Data Structure Deep Dive:

• When to Use HashMap vs HashSet?
  Discussed scenarios such as frequency counting (Map) and uniqueness checks (Set).
• Arrays vs HashMaps: Compared performance, look-up time, and use-cases.
• Internal Working of HashMaps: Hash functions, collision handling (open addressing, chaining), and time complexity.

⚙️ JavaScript Core Concepts:

• this keyword – context in arrow functions vs regular functions.
• Garbage Collection – Covered algorithms like Mark and Sweep, and explained memory leak examples.
• Staying Up-to-Date: Shared resources I follow:
  • React: React Docs, Kent C. Dodds, React 18 RFCs
  • JavaScript: ECMAScript proposals, TC39
  • Angular: Angular Blog, RxJS patterns

🔎 Round 5: Director Round – Final Technical + Behavioral

This was the final evaluation round with the Director of Engineering, combining system-level thinking, behavioral alignment, and technical depth.

👨‍💼 Introduction & Project Overview:

• Shared a high-level overview of my end-to-end contributions in recent applications.
• Emphasized collaboration, ownership, and mentorship experience.

🌟 Why Servicenow?

• Explained my motivation: working at scale, enterprise-level impact, and platform stability.
• Discussed alignment with Servicenow’s mission and global reach.

🔧 Technical Discussion:

🧩 Web Components:

• Shared experience building custom Web Components using Lit and vanilla JS.
• Discussed lifecycle hooks (connectedCallback, disconnectedCallback, etc.) with a small code example.

🧬 React & Web Components Integration:

• Techniques for embedding Web Components inside React (using ref, useEffect).
• Covered event propagation, attribute reflection, and custom event handling.

⚛️ React useState Hook:

• In-depth explanation of how useState works internally.
• Wrote a custom useState implementation using closures and showed how React batches state updates.
• Discussed how to support multiple useState calls in a single component (linked to fiber tree and hook call order).

❌ What Didn’t Work?

Despite performing well in all technical and behavioral rounds, I was not extended an offer by Servicenow.

Later, I learned that the final decision was influenced by internal headcount constraints and budget allocation changes, which limited the flexibility to proceed with external hires at that time.

Additionally, I was holding a competitive offer from CoinDCX, and since Servicenow chose not to match or counter it, I respectfully decided to move forward with the opportunity that better aligned with my expectations and growth path.

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💡 Tips to Crack the Servicenow Frontend Interview

1. Master Vanilla JavaScript. Many rounds emphasize DOM manipulation without React or frameworks.
2. Practice Real-World Projects. Focus on ToDo apps, Notepads, or simple UI clones.
3. Be Comfortable with Class-based JS. Especially useful in object-oriented tasks.
4. Write Clean Code. Avoid messy inline functions or unstructured logic.
5. Speak Through Your Thought Process. Communicate every assumption clearly in machine coding rounds.

📚 Recommended Topics to Prepare

• JavaScript ES6+ Features (Spread, Destructuring, Optional Chaining)
• DOM APIs (querySelector, appendChild, etc.)
• Array methods (map, reduce, filter)
• CSS basics + Flexbox/Grid
• System Design (basic Pub-Sub, Component Reusability)
• API Integration & async/await

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