01
DSA
Master problem solving, algorithms and data structures.
ArraysStringsTreesGraphsDPAdvanced DSA
One platform for the engineering skills that matter
Master Engineering.
Crack Interviews.
Learn, practice, and build the skills you need to become a better software engineer.
DSA, LLD, HLD, AI, System Design, Interview Preparation and Engineering Resources — all in one place.
Your engineering workspace Learning paths online
01
Problem Solving
DSA and algorithms
322 questions
02
Software Design
LLD and design patterns
138 problems
03
Systems at Scale
HLD and distributed systems
61+ lessons
04
AI Engineering
RAG, agents and production AI
152 lessons
05
Interview Readiness
Practice and guided preparation
Real scenarios
06
Engineering Library
Deep dives and practical guides
70+ articles
Explore Archtin
What do you want to master?
Choose a skill, understand the foundations, then move into deliberate practice.
02
LLD
Design maintainable, extensible and scalable software.
OOPSOLIDDesign PatternsLLD Problems
03
HLD / System Design
Learn how to design systems that scale from thousands to millions of users.
NetworkingDatabasesCachingQueuesDistributed Systems
04
AI Engineering
Go from AI fundamentals to building production-grade AI systems.
LLMsRAGAI AgentsMCPAI System DesignProduction AI
05
Interview Preparation
Prepare for real software engineering interviews.
DSALLDHLDBehavioralMock Interviews
06
Engineering Blogs
Deep dives into software engineering, AI, backend, cloud and more.
AIBackendSystem DesignCloudDevOpsNetworking
Guided journeys
Choose your learning path
Follow an intentional sequence instead of guessing what to study next.
Deliberate practice
Practice like a real interview
Browse every catalog first. Sign in only when you want to save, submit, or get feedback.
AI Engineering
Don't just learn AI. Build it.
Move from first principles to reliable production AI through structured lessons, visual labs, projects, and architecture practice.
- 01AI Foundations
- 02LLMs
- 03Prompt Engineering
- 04Embeddings
- 05RAG
- 06Vector Databases
- 07AI Agents
- 08MCP
- 09LangGraph
- 10AI System Design
- 11Production AI
How Archtin works
Learn → Practice → Build → Improve
A continuous loop for building engineering judgment, not just memorizing answers.
01
Learn
Understand concepts through structured learning paths.
02
Practice
Solve real DSA, LLD and HLD problems.
03
Build
Build practical AI and engineering projects.
04
Improve
Track progress and improve through feedback.
Engineering resources
Latest Engineering Insights
Practical deep dives written for engineers who want to understand how systems really work.
System Design14 min read
Stop Adding AI to Everything: Choose the Simplest Reliable Solution
Log alerts, rate limits, slow queries, caches, service calls, and deployments: solve the deterministic problem first. Add AI where uncertainty actually exists.
DevOps20 min read
5 DevOps + AI + Cloud Projects That Actually Stand Out
Not another CRUD app. Five projects—incident copilot, AI CI/CD, self-healing Kubernetes, cost optimizer and security engine—with build guides and reference repos.
System Design12 min read
Little's Law Explained: The One Formula That Connects Latency, Throughput, and Concurrency
Little's Law says concurrency equals arrival rate times time-in-system. One line of arithmetic sizes your thread pools, connection pools, and load tests — and explains why latency and throughput are the same knob.
DevOps15 min read
5 DevOps Concepts Developers Usually Get Wrong
Five familiar DevOps terms hide important operational differences. Learn the mechanism, the common mistake, and what changes in production.
DevOps22 min read
How Code Flows: From Local Development to Production
A visual, end-to-end trace of how one code change becomes a versioned production deployment—and how the platform validates, routes, observes, scales and rolls it back.
System Design24 min read
Behind the Scenes: 11 Technologies You Use Every Day
Follow the real paths behind eleven familiar technologies—from a B+ tree page lookup and JWT verification to DNS resolution, a TLS handshake and health-aware load balancing.
Loved by engineers
Built for engineers who keep growing.
"Finally, an interview prep that doesn't grade me like a compiler. The AI's follow-ups felt eerily close to my Stripe loop."
Anaya R.
Senior Backend · Stripe
"I run mocks on Archtin before every onsite. The tradeoff prompts forced me to actually defend my designs."
Marcus T.
Staff Engineer · Datadog
"Cleared L5 LLD in two weeks. The Parking Lot review caught coupling I'd ignored for months."
Priya S.
SDE-2 · Amazon
Pricing
One Pro plan. Pick your cadence.
Explore learning content free. Upgrade for full problem banks, projects, advanced practice, and expanded AI feedback.
Monthly
₹499/mo
Billed every month. Cancel anytime.
- Full LLD, HLD and AI practice access
- Expanded AI review credits with rubric scoring
- Mock interviews with senior-staff persona
- Submission history + attempt diffs
- Streak freeze + daily challenge bonus XP
Half-Yearly
Most popular₹349/mo
₹2,094 billed every 6 months. Save 30%.
- Full LLD, HLD and AI practice access
- Expanded AI review credits with rubric scoring
- Mock interviews with senior-staff persona
- Submission history + attempt diffs
- Streak freeze + daily challenge bonus XP
Annual
₹299/mo
₹3,588 billed yearly. Save 40%.
- Full LLD, HLD and AI practice access
- Expanded AI review credits with rubric scoring
- Mock interviews with senior-staff persona
- Submission history + attempt diffs
- Streak freeze + daily challenge bonus XP
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