Signals,systems&
thedeepcode.
Long-form engineering write-ups on how modern systems actually work. Articles, interactive browser-based labs, quick recall quizzes, and a dedicated systems atlas.
What's inside
Every article ships with an interactive lab and a quiz.
Networking
TCP, DNS, BGP, QUIC, and the protocols that hold the internet together.
Operating Systems
Scheduling, virtual memory, containers, and the kernel underneath.
Security
TLS, cryptography, password hashing, and how systems get broken.
Databases
Write-ahead logging, crash recovery, storage engines, and consistency.
Hardware
CPU pipelines, DRAM internals, SSDs, and low-level silicon.
Signals & RF
GPS, radar, software-defined radio, and wireless from the physics up.
Latest
How Inertial Navigation Systems Actually Work: MEMS Sensors, Quaternion Kinematics, and Extended Kalman Filtering
A comprehensive deep dive into Inertial Navigation Systems (INS). Examine MEMS accelerometers, Sagnac effect gyroscopes, strapdown coordinate transformations, unit quaternions, dead reckoning error accumulation, Extended Kalman Filter (EKF) sensor fusion, and ZUPT zero-velocity updates.
How FIX Protocol and High-Frequency Matching Engines Actually Work: Tag-Value Encoding, Limit Order Books, and Zero-Allocation Systems
A comprehensive deep dive into financial exchange infrastructure. Examine Financial Information eXchange (FIX) session messaging, Price-Time Priority matching engine algorithms, lock-free Disruptor ring buffers, Market Data ITCH/OUCH binary feeds, and zero-allocation memory architectures.
How CRDTs Actually Work: Conflict-Free Replicated Data Types, Semi-Lattices, and State Vectors
A comprehensive deep dive into Conflict-Free Replicated Data Types (CRDTs). Examine state-based (CvRDT) vs operation-based (CmRDT) architectures, semi-lattice upper bounds, LWW-Element-Sets, OR-Sets, sequence indexing (YATA/Automerge), vector clocks, tombstone garbage collection, and local-first synchronization.