Career OS

Library

Your whole library

Everything you built in Career Sprint — 17 tracks, 100+ modules — organised into proper tracks. Each track is its own page; open one, work its modules in order.

📍 The recommended path

Don’t wander. This is the order that actually works (start a track when the one before stops feeling like magic). DSA runs in parallel from the start.

Step 1☕ Core JavaThe language from your first program to memory, GC and a CLI capstone.
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Step 2🔀 Git & ToolingThe commit graph made visible — branching, remotes, undo/recovery, real fixes.
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Step 3🧩 DSA — Pattern-FirstPattern-first problem solving. The core patterns are rebuilt natively here in Career OS.
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Step 4🌐 NetworkingThe wire at runtime — TCP, DNS, HTTP, TLS, and a debug-the-wire capstone.
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Step 5🌱 Spring BootFrom "what is a bean" to a secured, tested REST API — the SplitEase backend.
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Step 6🗄️ SQL & Databasespsql-first SQL on a real schema — joins, modeling, indexes, transactions.
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Step 7💾 Databases (Systems)The systems layer under SQL — storage, NoSQL, replication, caching, interview prep.
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Step 8🏛️ System DesignHow real systems are shaped — with a case study and interactive visualizers.
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Step 9🐳 DockerContainers from the kernel up — images, Dockerfile, Compose, a containerize capstone.
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Step 10⚙️ CI/CD — GitHub ActionsWhat CI/CD is → first pipeline → testing gates → deploying, with a visualizer.
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Step 11☁️ Cloud / AWSWhat cloud is, the core services mapped, deploying, and cost/scaling/security.
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Step 12🕸️ Web InfrastructureDomains, DNS, hosting, email, TLS — how the internet is owned and configured.
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Step 13💳 Fintech DomainYour target market — payments, card networks, compliance, fintech system design.
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Step 14🔨 Projects — Portfolio LadderReal builds that land jobs — Recon, Relay, Dispatch, and the RupeeRail payment switch.
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All tracks

Foundation

🎯 Study System
3 modules

Must master

☕ Core Java
11 modules
🌱 Spring Boot
10 modules
🗄️ SQL & Databases
9 modules
🌐 Networking
8 modules
🔀 Git & Tooling
8 modules
🔨 Projects — Portfolio Ladder
5 modules

Strong advantage

🧩 DSA — Pattern-First
12 modules
🏛️ System Design
9 modules
💾 Databases (Systems)
8 modules
🐳 Docker
9 modules
💳 Fintech Domain
5 modules

Good to have

⚙️ CI/CD — GitHub Actions
7 modules
☁️ Cloud / AWS
4 modules
🕸️ Web Infrastructure
8 modules
💰 Money — Personal Finance
6 modules

This is your full reference library — everything, all in one app, no external sites. For your interview, follow the Siemens Roadmap first; come here to go deeper or after.