AI & Agents
Agentic RAG Knowledge Platform Build a hybrid-search RAG service that routes queries across retrieval, web fallback, and a reranker, with citations and an offline eval harness that scores faithfulness.
AI & Agents
Autonomous Coding Agent Build an agent that reads a GitHub issue, plans, edits files in a sandbox, runs tests, self-corrects on failures, and opens a pull request, then score it on real SWE-bench tasks.
AI & Agents
Build Your Own LLM From Scratch Train a small GPT-style model end to end: write the tokenizer, the transformer, pretraining, supervised fine-tuning, and a chat inference server you can talk to.
AI & Agents
Multimodal Semantic Search Engine Index images and text into one embedding space with CLIP, build a low-latency vector index with metadata filtering, and serve cross-modal search where text queries find images.
AI & Agents
RAG Over Your Notes A chatbot that answers from your own PDFs, notes, and Obsidian vault, with sources.
AI & Agents
Real-Time Voice Agent With MCP Tools Build a sub-second speech-to-speech agent that calls live tools through a Model Context Protocol server you write, with barge-in, streaming audio, and turn-taking handled cleanly.
Data & ML
Fine-Tune and Serve a Domain LLM Curate a domain dataset, fine-tune an open model with QLoRA, quantize it, serve it behind a fast inference endpoint, and prove the lift with an LLM-judge eval suite.
Data & ML
Real-Time Fraud Detection Pipeline Stream transactions through Kafka and Flink, compute online features in a feature store, score them with a model in under a second, and watch precision and recall drift on a live dashboard.
Data & ML
Two-Tower Recommender Engine Build a production recommender with two-tower retrieval and a ranking model, serve nearest-neighbor candidates from an ANN index, and run an offline-to-online A/B eval loop.
Data & ML
Vectorized Columnar Query Engine Build a small analytical query engine that parses SQL, plans and optimizes it, and executes vectorized scans and joins over columnar Parquet files with predicate pushdown.
Security
Supply-Chain Security Scanner Build a CLI that generates an SBOM for a repo, flags known CVEs and risky transitive dependencies, verifies build provenance with signatures, and gates a CI pipeline on policy.
Systems & CLI
Distributed Key-Value Store With Raft Implement Raft leader election and log replication from scratch, build a replicated key-value store on top, add snapshots and membership changes, and survive partitions under a fault injector.
Web
Collaborative Editor With CRDTs Build a real-time multiplayer document editor where edits merge without conflicts using a CRDT, sync offline-first over WebSockets, and show live cursors and presence.
Systems & CLI
Build Your Own Shell Write a Unix shell in C that runs external programs, pipes them together, redirects their I/O, and handles signals like a real terminal.
Systems & CLI
Build a Text Editor Write a terminal text editor in about 1000 lines of C with raw-mode input, VT100 screen rendering, syntax highlighting, and incremental search.
Systems & CLI
Build a Database Build a small relational database with a SQL REPL, a paged storage engine, and a B-tree index that persists rows to disk.
Systems & CLI
Build Your Own Git Reimplement the core of Git as a content-addressable store with init, add, commit, log, and branches backed by SHA-1 blobs, trees, and commits.
Games
Build a Ray Tracer Write a physically based ray tracer that renders spheres with diffuse, metal, and glass materials, plus anti-aliasing and depth of field, to an image file.
Backend & APIs
Build a BitTorrent Client Write a BitTorrent client that parses a .torrent file, contacts the tracker, and downloads a real file in pieces over the peer wire protocol.
Security
Build a DNS Resolver Write a DNS resolver that builds and parses binary DNS packets over UDP and recursively resolves names starting from the root servers.
DevOps & Cloud
Build a Container Runtime Run a process inside an isolated container using Linux namespaces, cgroups, and a chrooted root filesystem, with no Docker involved.