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REQUIREMENT_ID_1444 • 3-DAY_ACTIVE_POLICY N

Software Engineer R&D

Company
Company Airtel
Type
Opportunity Type Full-Time Job
Salary
Stipend / Salary Competitive Package (Best in Industry)
Location
Location Gurugram, India
Posted Date
Posted Date Yesterday
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Openwrt 802.11 standards TR181 TR369. prplOS WireShark SSIDs switching python
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Aptitude Practice Questions & Mock Tests Open Resource ↗
Curated logical, quantitative, and verbal reasoning problems for the initial online screening round.
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Company-Specific Interview Preparation Corner Open Resource ↗
Detailed interview experiences, exam formats, and previous test questions for Airtel and tech roles.
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Technical Placement Cheat Sheets & Question Bank Open Resource ↗
High-yield coding cheat sheets, core CS fundamentals (OOP, DBMS, OS, Networks), and rapid revision guides.
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Algorithm, DSA & Live Code Debugger Practice Open Resource ↗
Hands-on problem sets to improve coding speed and step-by-step memory debugging.

Experience: 4-9 Yrs. Open to matching qualifications.

1
Online Assessment / Technical Interview Rounds / HR Review
Job Description: Software Engineer/Senior Software Engineer Job Summary: We are seeking a motivated and detail-oriented Software Engineer to join our team. The ideal candidate will have a foundational understanding of networking concepts and scripting (preferably in Python). Familiarity with Linux environments, OpenWRT, Wi-Fi technologies, and diagnostic tools like Wireshark is essential. Key Responsibilities: Technical co-ownership of the product from its journey of conceptualizations, initial evaluation, solution design, execution, deployment, continuous improvement and assurances. Assist is product software evaluation and propose solutions as per Airtel requirements and deployments. Understanding Airtel network and requirements and translate those to device requirements. Assist in monitoring and troubleshooting network performance using tools like Wireshark and other diagnostic utilities. Support the configuration and maintenance of network devices (eg: access points). Write and maintain basic Python scripts to automate routine network tasks and data analysis. Collaborate with senior engineers to support device testing and validation Work within Linux environments for scripting, log analysis, and network diagnostics. Document network configurations, procedures, and troubleshooting steps. Participate in root cause analysis and resolution of network issues. Stay updated with emerging networking technologies and standards. Required Qualifications: Bachelors degree in Computer Science, Electronics & Communication, Information Technology. Basic understanding of networking fundamentals (TCP/IP, DNS, DHCP, Ethernet, IPv4/IPv6, routing, switching, VLAN etc). Hands-on experience or coursework in Wireshark and network packet analysis. Proficiency in Python and scripting for automation or data parsing. Exposure to Linux environments and basic shell scripting. Understanding of Wi-Fi technologies and concepts (802.11 standards, SSIDs, authentication, roaming, mesh, steering, bandsteering etc). Ability to perform Wi-Fi troubleshooting and diagnostics. Strong problem-solving skills and a proactive attitude. Exposure to openwrt Good communication and documentation skills. Good to have knowledge on GPON, OMCI. Good to have proficiency in prplOS. Good to have knowledge of TR181 and TR369. Preferred Qualifications: Internship or project experience in a networking or telecom environment. Certifications such as CCNA or vendor-specific credentials. Familiarity with network security principles.

Airtel — Software Engineering & Full Stack Interview Guide

Previously asked questions, exam syllabus, coding benchmarks & round strategy.

APTITUDE & LOGIC 📖
Aptitude Practice Questions & Online Mock Tests

Curated logical, quantitative, and verbal reasoning problems to sharpen reasoning skills required for the initial screening test.

Open Resource ↗
COMPANY GUIDE 🎯
Airtel Interview Preparation Corner

Comprehensive guide covering typical interview formats, common questions, and preparation tips for Airtel and off-campus tech roles.

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MOCK TESTS & PAPERS 📝
Comprehensive Interview Prep Resources & Syllabus

Collection of previous year questions, company-specific test patterns, and interview experiences for technical and HR rounds.

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CODING PRACTICE 💻
Algorithm and Data Structure Problem Set

Practice problems to improve coding proficiency and algorithm problem-solving speed for technical rounds.

Open Resource ↗
Round 1: Online Assessment (OA)
Aptitude, Quantitative Logic & 2 Coding Problems
Focus on accuracy and speed. Practice arrays, strings, and standard arithmetic puzzles.
Round 2: Technical Interview 1
Core Tech Stack (Openwrt, 802.11 standards, TR181 TR369., prplOS, WireShark, SSIDs, switching, python) & Live Code Tracing
Explain your thought process aloud. Analyze time & space complexities before coding.
Round 3: System Design & Problem Solving
Database Schemas, APIs & Architecture Basics
Clarify edge cases, diagram schemas cleanly, and discuss scalability trade-offs.
Round 4: HR & Cultural Fit Discussion
Airtel Core Values, Learning Agility & Offer Terms
Demonstrate passion, strong communication, and readiness for full-time collaboration.
Explain OOP (Object-Oriented Programming) principles with real-world examples in Openwrt. Answer ▼
Model Answer: 1. Encapsulation (data hiding via private fields/getters). 2. Abstraction (hiding implementation complexity). 3. Inheritance (code reusability). 4. Polymorphism (method overriding/overloading).
What is the time and space complexity of QuickSort vs MergeSort? Answer ▼
Model Answer: QuickSort: Average O(N log N) time, O(log N) space. Worst O(N^2). MergeSort: Guaranteed O(N log N) time, but requires O(N) auxiliary space.
Explain the difference between SQL Indexing (B-Tree vs Hash) and when not to use an index. Answer ▼
Model Answer: Indexes speed up SELECT queries via B-Trees. However, they slow down INSERT, UPDATE, and DELETE operations because indexes must be updated on disk. Avoid on low-cardinality columns (e.g., boolean flags).
What happens under the hood when you enter a URL in a browser? Answer ▼
Model Answer: 1. DNS lookup (resolves IP). 2. TCP 3-way handshake (SYN, SYN-ACK, ACK). 3. TLS negotiation for HTTPS. 4. HTTP GET request sent. 5. Server responds with HTML/CSS/JS. 6. Browser renders DOM & CSSOM tree.
What is the difference between REST and GraphQL APIs? Answer ▼
Model Answer: REST uses multiple fixed endpoints with possible over/under-fetching. GraphQL uses a single endpoint allowing clients to query exact fields in a single request.
Why do you want to join Airtel as a Software Engineer R&D?
Preparation Tip: Highlight Airtel's market reputation, recent tech innovations, and how your skills in Openwrt directly solve their team's objectives.
Describe a challenging bug or academic project roadblock and how you resolved it.
Preparation Tip: Use the STAR method: Situation (project context), Task (what needed solving), Action (specific tools/logic applied), Result (quantifiable positive outcome).
How do you handle strict deadlines or sudden scope changes?
Preparation Tip: Explain your prioritization strategy, proactive communication with mentors/peers, and agile mindset.

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