What is Sysiq and how is it different from reading static blogs?

Sysiq is an interactive system design platform where you don't just read about distributed systems — you actively build and test them. Solve real-world engineering challenges using a live diagram canvas, guided architectural labs, and real-time napkin math estimation tools.

Is Sysiq suitable for preparing for FAANG system design interviews?

Yes. Sysiq is tailored specifically for mid-level, senior, and staff engineering interviews (L4–L7). The problem bank covers actual interview scenarios: URL shorteners, distributed rate limiters, key-value stores, video streaming architectures, and real-time chat systems.

Can I use Sysiq for free?

Yes. Foundational modules, introductory interview problems, the Napkin Math calculator, and the global engineering leaderboard are all free with no time limit.

Do I need prior distributed systems experience to get started?

Not at all. The curriculum starts with fundamental building blocks — DNS, reverse proxies, database replication, and caching — and progressively walks you up to complex architectures like Raft consensus, vector clocks, and LSM-tree compaction.

Why can't browsers call gRPC directly?

Browsers do not expose low-level HTTP/2 frame control required by gRPC. gRPC-Web acts as a translation layer for browser clients.

Back to ComparisonsAPIs & Networking

REST APIs vs gRPC: Inter-Service Communication

HTTP/1.1 JSON APIs vs HTTP/2 Protocol Buffers for high-speed microservices.

Launch Interactive System Simulator

REST (HTTP/JSON)

Interactive Lab

Representational State Transfer relying on standard HTTP verbs, stateless requests, and human-readable JSON payloads.

Key Advantages

Universal browser & client support
Human-readable JSON payloads
Broad ecosystem & caching support

Trade-offs

Text-based JSON payload overhead
HTTP/1.1 head-of-line blocking
No enforced API contract by default

BEST FOR WORKLOAD

Public client-facing web and mobile APIs

gRPC (HTTP/2 ProtoBuf)

Interactive Lab

High-performance RPC framework using binary Protocol Buffers over HTTP/2 multiplexed streams.

Key Advantages

Binary serialization (up to 10x faster than JSON)
HTTP/2 multiplexing & bidirectional streaming
Strict, strongly typed Protobuf schema contracts

Trade-offs

Browser incompatibility without gRPC-Web proxy
Non-human-readable binary payloads in debugging

BEST FOR WORKLOAD

Internal microservice-to-microservice communication and high-frequency streaming

Architectural Decision Matrix

Vector	REST (HTTP/JSON)	gRPC (HTTP/2 ProtoBuf)
Protocol	HTTP/1.1 or HTTP/2	Strict HTTP/2
Payload Format	JSON (Text)	Protocol Buffers (Binary)
Streaming	Request-Response (or SSE)	Unary, Client, Server, Bidirectional
Schema Contract	Optional (OpenAPI/Swagger)	Mandatory (.proto file compilation)

Summary & Architectural Recommendation

Use REST for public-facing APIs where developer accessibility and browser compatibility matter. Use gRPC for backend microservices where low latency and strict typing are essential.

Frequently Asked Questions

REST APIs vs gRPC: Inter-Service Communication

REST (HTTP/JSON)

Key Advantages

Trade-offs

gRPC (HTTP/2 ProtoBuf)

Key Advantages

Trade-offs

Architectural Decision Matrix

Summary & Architectural Recommendation

Frequently Asked Questions

Why can't browsers call gRPC directly?

Related Architectural Comparisons

Token Bucket vs Leaky Bucket: Rate Limiting Architecture

Monolithic Architecture vs Microservices

REST APIs vs gRPC: Inter-Service Communication

REST (HTTP/JSON)

Key Advantages

Trade-offs

gRPC (HTTP/2 ProtoBuf)

Key Advantages

Trade-offs

Architectural Decision Matrix

Summary & Architectural Recommendation

Frequently Asked Questions

Why can't browsers call gRPC directly?

Related Architectural Comparisons

Token Bucket vs Leaky Bucket: Rate Limiting Architecture

Monolithic Architecture vs Microservices