Claude Code course · Kolkata
Claude Code Training in Kolkata for Modernisation Teams
A Claude Code workshop for Kolkata engineers in Salt Lake Sector V and New Town who maintain and modernise long-lived business systems. Learn to read old code with Claude, write the tests it never had, and migrate it step by step without disrupting month-end close.
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Overview
Modernising legacy systems with Claude Code in Kolkata
Kolkata’s IT workforce is concentrated in two places: Salt Lake Sector V, where the city’s software industry took shape, and the newer campuses of New Town and Rajarhat. Much of the work done there is services delivery for global clients, but a distinctive share supports the diversified business groups headquartered in the city and across eastern India. Their systems span tea, FMCG, power, cement, steel, logistics and retail, and many have grown over decades: COBOL or RPG on midrange machines, Oracle Forms, classic ASP, Visual Basic and early Java applications wrapped around a heavily customised ERP.
That legacy estate is where Claude Code earns its place. Our Claude Code training in Kolkata teaches a cautious, test-first approach to modernisation. Developers ask Claude to explain a program, map its data flows and list the business rules buried in it, then generate characterisation tests that pin down current behaviour before anything changes. Only then do they refactor or port a module, using plan mode to agree the steps and Opus 5.5 for the long, many-file passes.
Keeping the business running
Conglomerate systems close books, run payroll and despatch goods, so we teach parallel runs, reconciliation scripts and rollback plans. We also cover documentation: Claude writes module guides and data dictionaries so knowledge no longer sits with a few specialists nearing retirement. Secure review of AI-written code, secrets handling, DPDP Act care for employee and customer data, and CERT-In incident duties are part of every batch.
Services teams get the same core, plus the contract and client-permission checks that offshore delivery demands.
Highlights
What Kolkata engineers learn
Explain legacy code plainly
Ask Claude to walk through COBOL, Oracle Forms or Visual Basic programs and list the business rules they enforce.
Characterisation tests first
Generate tests that capture current behaviour before refactoring, so every change can be checked against the old system.
Step-by-step migration
Port modules incrementally using plan mode and Opus 5.5, with each step merged, tested and easy to reverse.
Data dictionaries and lineage
Have Claude document tables, fields and data flows so future teams understand how the system really works.
Parallel runs and reconciliation
Write scripts that compare old and new system outputs line by line during parallel runs before cutover.
Safe handling of business data
Keep payroll, customer and vendor data out of sessions using masked samples, permission modes and hooks.
In your workflow
Retiring an old billing module
A group’s distribution business still raises invoices from an Oracle Forms module. The team opens Claude Code on the source, asks it to list every pricing and discount rule, and turns that list into characterisation tests. Claude then helps port the logic to a Java service step by step, and a reconciliation script compares a month of old and new invoices before cutover.
- Extract pricing and discount rules
- Write characterisation tests
- Port the logic step by step
- Reconcile a month before cutover
Use it for
Kolkata use cases for Claude Code
COBOL and midrange modernisation
Understand and gradually replace COBOL or RPG batch programs, with Claude documenting each job before it is rewritten or retired.
ERP customisation clean-up
Review years of custom ERP code, flag unused objects and duplicated logic, and plan a cleaner path to the next upgrade.
Logistics and distribution systems
Maintain despatch, inventory and dealer-management applications used by manufacturing and FMCG groups across eastern India.
Knowledge capture before retirements
Turn the knowledge of long-serving developers into module guides, runbooks and code comments before they move on from the team.
Offshore services delivery
Apply Claude Code to maintenance, testing and enhancement work for global clients, staying within each client’s contract permissions.
Web front-ends for old systems
Build modern web screens and APIs in front of legacy back-ends so users get a better interface without a risky rewrite.
Training
Programme format in Kolkata
Cowork is a skill — we teach it hands-on, on your real work.
Sector V, New Town or online
Onsite at your office in Salt Lake Sector V, New Town or central Kolkata, or live-online for teams in Bhubaneswar and beyond.
Mixed-experience batches
Designed for groups that combine veteran legacy developers with younger engineers, so each learns from the other.
Modernisation plan outline
Day two ends with each team drafting a modernisation plan for one real module, ready for management review.
FAQ
Claude Code Training in Kolkata for Modernisation Teams — questions
Can Claude Code really work with COBOL and Oracle Forms?
Is this only for conglomerate in-house IT teams?
How long does a legacy modernisation take with Claude Code?
Which model should we use for large legacy codebases?
Can the training run in Hindi or Hinglish?
Who delivers it
Anthropic-certified Claude trainers
Every programme is delivered by Anthropic Claude Certified trainers who use Claude daily on live client work — engineering, analysis, research and content. We have trained 200,000+ professionals across 16+ countries for 600+ enterprise clients, including Tata Group, Adani, Siemens, GE Aerospace, HUL, Flipkart and Air India.
- Anthropic Claude Certified trainers, not generalist AI speakers
- 200,000+ professionals trained across 16+ countries
- 600+ enterprise clients, from BFSI and manufacturing to public sector
- Delivered in English, Hindi and Hinglish
Trusted by
Teams we’ve trained
…and 200+ organisations, across 16+ countries.
What participants say
Real feedback from real sessions
Verified feedback collected from participants across corporate sessions — average rating 4.8/5.
“A very productive session for working professionals. A must-do.”
“The session was highly insightful and conducted in a very professional and interactive manner. Learnt about AI and excited to learn more!”
“Highly recommended! Hands-on and directly useful — from making PPTs and strategic plans to building KRAs.”
“Great work done by Mr Hitesh in the AI landscape — a true subject-matter expert. More power to him for spreading this knowledge.”
“I would recommend everyone to go through this session — it clarifies both what to expect from AI and where AI isn’t needed.”
“Amazing session by Hitesh. The AI tools he shared are very helpful for day-to-day work.”
“Mr Hitesh Motwani is a very informative trainer. The way he delivers training is awesome.”
“Mr Hitesh Motwani delivered a valuable, informative session and showed us exactly how to use AI tools to enhance our work. Thank you so much.”
“A nice interactive session with a lot of new insights and the power of AI. This will help me save time in routine activities.”
“A very good training session. AI can do wonders — we’ll implement it to create efficiency and save time.”
“Hitesh was very informative and knowledgeable about AI tools. It will let me use my time far more effectively.”
“Your session helped me walk into the world of magic.”
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Book Claude Code training in Kolkata
Tell us your team, tools and goals. We will scope a tailored workshop and send a fixed proposal — usually within one business day.