Project Roulette / Projects

Full-stack, Mobile, Data & ML, Systems and Games projects

15 of 30 projects. Each has a stack, five features to ship, a difficulty, a time estimate, and a bonus challenge.

Full-stack · Advanced · 2–3 weeks

Real-time Collaborative Whiteboard

A multiplayer canvas where several people draw, add sticky notes, and see each other's cursors live, with edits that never conflict.

  • React
  • TypeScript
  • Yjs (CRDT)
  • WebSockets
  • Node.js
  • PostgreSQL

Features

  1. Shapes, freehand drawing, and sticky notes
  2. Live cursors and presence indicators
  3. Conflict-free merging of simultaneous edits using CRDTs
  4. Shareable boards with view-only and edit links
  5. Persistent boards with version history

Bonus: Offline editing that merges cleanly with everyone else's changes when you reconnect.

Full-stack · Advanced · 2–3 weeks

Live Coding Interview Room

Create a room, share a link, and code together in a shared editor. Code runs in sandboxed containers and both people see the output.

  • Next.js
  • Monaco Editor
  • WebSockets
  • Docker
  • Redis

Features

  1. Shared editor with synced cursors and selections
  2. Run Python, JavaScript, or C++ in isolated containers with CPU, memory, and time limits
  3. Private notes panel only the interviewer can see
  4. Session playback of the whole interview
  5. Rooms that expire and clean up automatically

Bonus: Hidden test cases that grade the candidate's solution automatically and show a pass/fail report.

Full-stack · Intermediate · 2 weeks

Uptime Monitor & Public Status Page

Monitors websites and APIs every minute, detects outages, opens incidents, and publishes a clean public status page with uptime history.

  • Next.js
  • TypeScript
  • PostgreSQL
  • Node.js worker
  • Email or Discord webhooks

Features

  1. HTTP, TCP, and keyword checks run on a schedule by a worker
  2. Incident detection that confirms with retries to avoid false alarms
  3. 90-day uptime bars and response-time charts
  4. Email and Discord alerts when something goes down
  5. Admin page for posting incident updates

Bonus: Checks from two regions that only open an incident when both agree the service is down.

Mobile · Intermediate · 2–3 weeks

Offline-first Field Inspection App

A mobile app for technicians who inspect equipment on site: checklists, photos, and signatures that work with no signal and sync later.

  • React Native (Expo)
  • TypeScript
  • SQLite
  • Supabase

Features

  1. Dynamic checklist templates loaded from the server
  2. Photo capture with on-image annotation
  3. Local-first storage with background sync and conflict handling
  4. Signature capture and PDF report export
  5. GPS-tagged inspections

Bonus: A small web admin dashboard where managers create templates and review submitted inspections.

Mobile · Intermediate · 2 weeks

Bluetooth LE Sensor Companion App

A phone app that discovers a Bluetooth Low Energy sensor, streams live readings, keeps a history, and sends settings back to the device.

  • Flutter (Dart)
  • flutter_blue_plus
  • SQLite
  • ESP32 or nRF52 as the peripheral

Features

  1. Scan, connect, and auto-reconnect to the device
  2. A custom GATT service and characteristics that you define
  3. Live charts of incoming readings
  4. Local history with CSV export
  5. Write settings like sample rate and thresholds back to the device

Bonus: Firmware updates delivered over Bluetooth straight from the app.

Data & ML · Intermediate · 1–2 weeks

Resume ↔ Job Description Matcher

Upload a resume and a job posting. It scores how well they match, highlights missing skills, and suggests stronger bullet points.

  • Python
  • sentence-transformers
  • spaCy
  • FastAPI
  • Streamlit

Features

  1. PDF parsing and section extraction (experience, skills, education)
  2. Skill extraction against a curated skills taxonomy
  3. Semantic similarity scoring with a readable explanation
  4. Gap report listing missing and weak skills
  5. A small labeled test set that measures accuracy

Bonus: Benchmark three embedding models on your test set and publish the results table in the README.

Data & ML · Intermediate · 1–2 weeks

Webcam Hand-Gesture Controller

Recognizes hand gestures from a webcam in real time and uses them to control slides, media playback, or smart lights.

  • Python
  • MediaPipe
  • PyTorch or scikit-learn
  • OpenCV

Features

  1. Hand landmark extraction from live video
  2. Data-collection tool for recording custom gestures
  3. Trained classifier with a confusion matrix and accuracy report
  4. Smoothing and debounce so actions don't misfire
  5. Config file that maps gestures to actions

Bonus: Export the model to ONNX and run it fully in the browser with a live demo page.

Data & ML · Advanced · 2–3 weeks

Predictive Maintenance for Jet Engines

Predicts the remaining useful life of jet engines from sensor time series using NASA's C-MAPSS dataset, served behind an API with a monitoring dashboard.

  • Python
  • pandas
  • LightGBM or PyTorch
  • MLflow
  • FastAPI
  • Docker

Features

  1. Exploratory analysis and time-series feature engineering
  2. A baseline model and an LSTM, compared with proper time-based validation
  3. Experiment tracking in MLflow
  4. Model served through FastAPI inside Docker
  5. Dashboard showing predictions per engine

Bonus: Data-drift detection that flags when incoming sensor data stops looking like the training data.

Data & ML · Intermediate · 2 weeks

Codebase Q&A Assistant

Index any Git repository and ask questions like "where is authentication handled?" Answers cite the exact files and lines they came from.

  • Python
  • tree-sitter
  • sentence-transformers
  • pgvector or Qdrant
  • FastAPI
  • An LLM API

Features

  1. Code-aware chunking by function and class using tree-sitter
  2. Hybrid keyword and vector search
  3. Answers with file and line citations
  4. Incremental re-indexing when new commits land
  5. An evaluation set of 30+ questions that measures retrieval accuracy

Bonus: A VS Code extension so you can ask questions without leaving the editor.

Systems · Advanced · 2–3 weeks

LSM-Tree Key-Value Store

A persistent key-value database built from scratch with a write-ahead log, memtable, SSTables, and compaction, like a tiny RocksDB.

  • Rust or C++
  • TCP
  • criterion / Google Benchmark

Features

  1. Write-ahead log with crash recovery
  2. Memtable flushed to sorted SSTable files
  3. Bloom filters to skip unnecessary disk reads
  4. Background compaction
  5. Simple TCP protocol with a CLI client

Bonus: Benchmarks against SQLite with throughput and latency graphs in the README.

Systems · Advanced · 2–3 weeks

RISC-V Emulator with Debugger

An RV32I CPU emulator that runs real programs compiled with GCC, plus a step debugger for registers and memory.

  • C++ or Rust
  • RISC-V GCC toolchain
  • SDL2 (optional)

Features

  1. Fetch, decode, and execute for the full RV32I instruction set
  2. ELF loader for compiled binaries
  3. Memory-mapped UART so programs can print
  4. Step debugger with register and memory views
  5. Passes the official riscv-tests suite

Bonus: A 5-stage pipeline view that visualizes hazards, stalls, and forwarding cycle by cycle.

Systems · Advanced · 2–3 weeks

Mini Container Runtime

Your own version of docker run, built from scratch: isolated processes with their own filesystem, process tree, network, and resource limits.

  • Go or C
  • Linux namespaces
  • cgroups v2
  • OverlayFS

Features

  1. PID, mount, UTS, and network namespaces
  2. Root filesystem set up with pivot_root from an image tarball
  3. CPU and memory limits using cgroups v2
  4. Layered filesystems with OverlayFS
  5. veth networking so containers can reach the internet

Bonus: Pull and run real images from Docker Hub by implementing the registry API.

Systems · Advanced · 2–3 weeks

Compiler for a Small Language

A compiler for your own small language, with variables, functions, loops, and structs, that outputs WebAssembly or x86-64 assembly and runs real programs.

  • Rust, C++, or OCaml
  • WebAssembly (WAT) or x86-64
  • A test harness

Features

  1. Hand-written lexer and recursive-descent parser
  2. Type checker with clear error messages that point at the source
  3. An intermediate representation with constant folding and dead-code elimination
  4. Code generation to WebAssembly or assembly
  5. Test suite of example programs with expected output

Bonus: A web playground that compiles and runs programs right in the browser.

Games · Advanced · 2–3 weeks

Multiplayer Arena with Real Netcode

A fast top-down browser arena game with an authoritative server, client-side prediction, and lag compensation, so it feels smooth even at 150 ms ping.

  • TypeScript
  • HTML Canvas or Phaser
  • Node.js
  • WebSockets

Features

  1. Authoritative server running at a fixed tick rate
  2. Client-side prediction with server reconciliation
  3. Entity interpolation for other players
  4. Lobby and simple matchmaking
  5. Built-in network simulator with latency and packet-loss sliders

Bonus: A replay system that records inputs and plays back any match deterministically.

Games · Intermediate · 2–3 weeks

Procedural Roguelike with ECS

A turn-based dungeon crawler with procedurally generated levels, built on an entity-component-system architecture.

  • Rust + Bevy
  • or C# + Godot
  • WebAssembly build

Features

  1. Seeded dungeon generation using BSP or cellular automata
  2. Entity-component-system architecture for all game objects
  3. Field of view and A* pathfinding for enemies
  4. Items, inventory, and save/load
  5. A playable web build published on itch.io

Bonus: A daily seeded challenge where everyone plays the same dungeon.