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REQUIREMENT_ID_210 β€’ 3-DAY_ACTIVE_POLICY

Mainframe Developer

Company
Company Infosys
Type
Opportunity Type Internship
Salary
Stipend / Salary 4.5 LPA
Location
Location Pan India
Posted Date
Posted Date Today
COBOL PL/1 CICS JCL DB2 IBM Rational IDz IBM Rational RDz IBM Rational RBD IBM Rational RTC Agile methodology problem solving communication
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Infosys Placement Papers Open Resource β†—
Curated previous year placement papers that help you practice core mainframe and aptitude questions for the Infosys recruitment process.
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Infosys Recruitment Process Experiences Open Resource β†—
First‑hand candidate experiences detailing each interview round, useful for setting expectations and preparation strategy.
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Infosys Interview Preparation Guide Open Resource β†—
Comprehensive guide covering technical topics, sample questions, and interview tips specific to Infosys roles.
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Algorithm Practice Problems Open Resource β†—
Extensive problem set to sharpen coding and logical reasoning skills, essential for the online assessment stage.

Eligible degrees: BE, BTech, BSc, BCA, MTech, MSc, MCA. Minimum aggregate: 60% (or CGPA 6.0/10). Final year students of the 2026 batch are preferred. No active backlogs at the time of joining; a maximum of 2 backlogs allowed in the final semester, provided they are cleared before the joining date.

1
Round 1: Online Assessment (aptitude + coding)
2
Round 2: Technical Interview (core mainframe concepts, problem solving)
3
Round 3: HR Interview (fitment, communication, career goals)
Infosys Limited, a global leader in consulting, technology, and next‑generation services, has a strong presence across 50+ countries and employs over 350,000 professionals. The company is renowned for its commitment to innovation, sustainability, and continuous learning, offering a robust platform for fresh talent to grow into industry experts. With a focus on digital transformation, cloud, AI, and enterprise solutions, Infosys provides a stable yet dynamic environment where new graduates can gain exposure to large‑scale projects and cutting‑edge technologies. The Freshers Mainframe Developer role sits within the Application Development and Maintenance service line. As a Mainframe Developer, you will be responsible for designing, coding, testing, and supporting mission‑critical applications that run on IBM Z platforms. The position is ideal for candidates with a foundation in COBOL, PL/1, CICS, JCL, and DB2, and who are eager to deepen their expertise in mainframe ecosystems while collaborating with cross‑functional teams. Key Responsibilities: 1. Analyze user requirements and translate them into functional mainframe specifications. 2. Design, develop, and maintain COBOL/PL‑1 programs adhering to coding standards. 3. Write and manage JCL scripts for batch processing and job scheduling. 4. Implement and support CICS transaction flows and monitor performance. 5. Develop, query, and optimize DB2 databases for data‑intensive operations. 6. Perform unit testing, debugging, and code reviews to ensure high‑quality deliverables. 7. Participate in Agile ceremonies, sprint planning, and daily stand‑ups. 8. Troubleshoot production incidents, identify root causes, and propose corrective actions. 9. Document technical solutions, maintain knowledge‑base articles, and assist in knowledge transfer. 10. Stay updated with IBM Rational tools (IDz, RDz, RBD, RTC) and incorporate best practices. Tech Stack: COBOL, PL/1, CICS, JCL, DB2, IBM Rational Developer for z/OS (IDz), Rational Developer for System z (RDz), Rational Business Developer (RBD), Rational Team Concert (RTC), Agile tools. Growth Path: Starting as a Mainframe Developer (Analyst level), you can progress to Senior Analyst, Technical Lead, and eventually to Architecture or Management roles within Infosys’ extensive service lines. The exposure to enterprise‑grade systems and the company’s internal learning platforms accelerates skill development and opens doors to diverse technology tracks. Why Join Infosys? Infosys offers a structured onboarding program, mentorship from seasoned professionals, and access to global projects that enhance both technical and soft skills. The organization’s emphasis on continuous upskilling, certifications, and a collaborative culture makes it an attractive launchpad for a long‑term career in technology.

Infosys β€” AI & Machine Learning Interview Guide

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

APTITUDE & LOGIC πŸ“–
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 β†—
COMPANY GUIDE 🎯
Infosys Interview Preparation Corner

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

Open Resource β†—
MOCK TESTS & PAPERS πŸ“
Comprehensive Interview Prep Resources & Syllabus

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

Open Resource β†—
CODING PRACTICE πŸ’»
Algorithm and Data Structure Problem Set

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

Open Resource β†—
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 (COBOL, PL/1, CICS, JCL, DB2, IBM Rational IDz, IBM Rational RDz, IBM Rational RBD, IBM Rational RTC, Agile methodology, problem solving, communication) & 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
Infosys Core Values, Learning Agility & Offer Terms
Demonstrate passion, strong communication, and readiness for full-time collaboration.
What is the bias-variance tradeoff and how do you prevent overfitting? Answer β–Ό
Model Answer: High bias leads to underfitting (oversimplified model), high variance leads to overfitting (captures noise). Mitigate using L1/L2 Regularization, Dropout, Cross-Validation, and data augmentation.
Explain the difference between Precision, Recall, and F1-Score. Answer β–Ό
Model Answer: Precision = TP / (TP + FP) (correctness of positive predictions). Recall = TP / (TP + FN) (coverage of actual positives). F1-Score is the harmonic mean of Precision and Recall.
How does Gradient Descent work and what is the role of Learning Rate? Answer β–Ό
Model Answer: It optimizes loss functions by iteratively moving weights in the direction of negative gradient. A large learning rate may overshoot the minimum; a small rate causes slow convergence.
What is the difference between Supervised, Unsupervised, and Self-Supervised learning? Answer β–Ό
Model Answer: Supervised uses labeled data (X -> y). Unsupervised finds hidden patterns in unlabeled data (clustering/PCA). Self-supervised generates labels from input data (e.g. masked language modeling in BERT/Transformers).
Why do you want to join Infosys as a Mainframe Developer?
Preparation Tip: Highlight Infosys's market reputation, recent tech innovations, and how your skills in COBOL 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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