Library

Your whole library

Everything you built in Career Sprint — 18 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.

Step 2🔀 Git & ToolingThe commit graph made visible — branching, remotes, undo/recovery, real fixes.

Step 3🧩 DSA — Pattern-FirstPattern-first problem solving. The core patterns are rebuilt natively here in Career OS.

Step 4🌐 NetworkingThe wire at runtime — TCP, DNS, HTTP, TLS, and a debug-the-wire capstone.

Step 5🔌 Backend & WebFramework-agnostic backend foundations — REST APIs and authentication.

Step 6🌱 Spring BootFrom "what is a bean" to a secured, tested REST API — the SplitEase backend.

Step 7🗄️ SQL & Databasespsql-first SQL on a real schema — joins, modeling, indexes, transactions.

Step 8💾 Databases (Systems)The systems layer under SQL — storage, NoSQL, replication, caching, interview prep.

Step 9🖥️ Platform: OS, C# & .NETThe ground everything runs on — OS fundamentals, plus C# and .NET (Siemens’ stack).

Step 10🏛️ System DesignHow real systems are shaped — with a case study and interactive visualizers.

Step 11🐳 DockerContainers from the kernel up — images, Dockerfile, Compose, a containerize capstone.

Step 12⚙️ CI/CD — GitHub ActionsWhat CI/CD is → first pipeline → testing gates → deploying, with a visualizer.

Step 13☁️ Cloud / AWSWhat cloud is, the core services mapped, deploying, and cost/scaling/security.

Step 14🕸️ Web InfrastructureDomains, DNS, hosting, email, TLS — how the internet is owned and configured.

Step 15💳 Fintech DomainYour target market — payments, card networks, compliance, fintech system design.

Step 16🔨 Projects — Portfolio LadderReal builds that land jobs — Recon, Relay, Dispatch, and the RupeeRail payment switch.

All tracks

Foundation

🎯 Study System

Must master

🌱 Spring Boot

🗄️ SQL & Databases

🔌 Backend & Web

🌐 Networking

🔀 Git & Tooling

🔨 Projects — Portfolio Ladder

Strong advantage

🧩 DSA — Pattern-First

🖥️ Platform: OS, C# & .NET

🏛️ System Design

💾 Databases (Systems)

💳 Fintech Domain

Good to have

⚙️ CI/CD — GitHub Actions

☁️ Cloud / AWS

🕸️ Web Infrastructure

💰 Money — Personal Finance

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.