The Forge

Data Analysis easy

CSV Sales Reader

You have been given a CSV file of weekly sales figures by your team lead. Before any analysis can happen, you need to demonstrate you can lo...

150000 EXP 2500 Coins

Not started

Error Handling easy

Robust Division Calculator

Build a small calculator that divides two numbers entered by the user. The program must handle non-numeric input (ValueError) and division b...

150000 EXP 2500 Coins

Not started

Error Handling easy

Robust Numeric Input

Write a function `get_positive_number(prompt)` that keeps asking the user for input until they enter a valid positive number (integer or flo...

150000 EXP 1500 Coins

Not started

Exception Handling easy

Robust Age Input Loop

MediCare's patient intake kiosk crashes when staff accidentally type letters into the age field. The bug has caused two full-reboot incident...

75000 EXP 2500 Coins

Not started

Functions & Validation easy

Smart Tip Calculator

A pub in Brum has gone digital. The bar staff are tired of fumbling with a calculator app every time a table of nine wants to split the bill...

50000 EXP 500 Coins

Not started

Object-Oriented Programming easy

Employee Payroll Class

NexusCorp's HR system needs a refactor. The old codebase has payroll logic scattered across dictionaries and helper functions. You've been a...

200000 EXP 5000 Coins

Not started

Algorithms medium

Binary Search Implementation

SwiftFind Analytics runs millions of product lookups per hour. Their engineers are benchmarking search implementations — yours goes up again...

100000 EXP 5000 Coins

Not started

Data Analysis medium

Category Sales Aggregation

The finance team needs a category-level breakdown showing total units, total revenue, and average revenue per transaction for each product c...

250000 EXP 2500 Coins

Not started

Data Analysis medium

Filter & Export Sales

Marketing wants a separate CSV file containing only the high-value transactions where revenue is at least 200. Filter the sales DataFrame, c...

250000 EXP 2500 Coins

Not started

Data Analysis medium

Filter Sales by Date Range

A line manager wants to see only the sales between two specific dates. Convert the Date column to proper pandas datetime values, then filter...

50000 EXP 5000 Coins

Not started

Data Analysis medium

Sales Dashboard CLI

A regional manager wants a quick command-line dashboard for browsing sales data without opening a spreadsheet. Build a menu-driven program t...

250000 EXP 5000 Coins

Not started

Data Analysis medium

Standardise CSV Categories

A CSV export from another system has inconsistent category names (some lowercase, some with extra whitespace, some with abbreviations like H...

5000000 EXP 500 Coins

Not started

Data Structures medium

Stack Data Structure

DevTools Inc is building an undo/redo system for their editor. Before hooking it into the UI layer they need a proper Stack implementation, ...

100000 EXP 5000 Coins

Not started

Data Visualisation medium

Bar Chart: Revenue by Product

Management wants a bar chart of total revenue per product for the briefing pack. Use pandas to aggregate the data and matplotlib to plot a l...

275000 EXP 1250 Coins

Not started

Data Visualisation medium

Multi-Series Line Graph

A regional manager wants to compare daily revenue trends for three products on the same chart. Build a multi-series line graph with one line...

2000000 EXP 500 Coins

Not started

Data Visualisation medium

Payment Method Pie Chart

The finance team wants a pie chart showing the proportion of revenue collected via each payment method (Cash, Card, Online). Build a pie cha...

300000 EXP 5000 Coins

Not started

Data Visualisation medium

Score Distribution Histogram

A teacher wants to see how exam scores are distributed across their class. Build a histogram showing the frequency of scores in 10-point bin...

1000000 EXP 250 Coins

Not started

Error Handling medium

Custom Exception for Bookings

A booking system needs a custom exception class for situations where a customer tries to book outside operating hours. Build a `BookingError...

250000 EXP 5000 Coins

Not started

Error Handling medium

Safe CSV File Reader

Build a function `safe_load_csv(path)` that loads a CSV file using pandas and returns the DataFrame. It must handle three error scenarios: f...

250000 EXP 5000 Coins

Not started

Exception Handling medium

Custom Exception for Inventory

StockKeeper — a warehouse management SaaS — has a bug report: generic `ValueError`s from their stock service are indistinguishable from othe...

100000 EXP 2000 Coins

Not started

File Handling & Data medium

CSV Sales Analyser

RetailPulse, a mid-size chain, emails their analysts a CSV of daily sales every morning. The analysts have been copy-pasting totals into cal...

200000 EXP 3500 Coins

Not started

File Processing & Regex medium

Apache Log Analyzer

A web hosting client reckons their site is being scraped. They have handed you a 200MB Apache access.log and they want answers — fast. Buil...

250000 EXP 2500 Coins

Not started

Menu-Driven Apps medium

Inventory Menu System

Build a small inventory management CLI for a warehouse. The user can add a product, remove a product, list all products with their stock lev...

250000 EXP 2500 Coins

Not started

Object-Oriented Programming medium

Bank Account with Validation

Meridian Banking's core ledger microservice needs a robust account class. The previous implementation let balances go negative silently — ca...

250000 EXP 5000 Coins

Not started

Object-Oriented Programming medium

Library Loan Tracker

Worcester County Library is replacing its ancient loans system. They have asked you to build the core domain logic in Python: books, members...

100000 EXP 1000 Coins

Not started

Object-Oriented Programming medium

Shape Hierarchy with Inheritance

CAD-Forge, a drafting toolkit, needs a geometry module. Rather than a bloated if-chain for each shape type, the team wants a clean inheritan...

250000 EXP 5000 Coins

Not started

Real-World Applications medium

Password Strength Validator

SecureVault is rolling out a new account creation flow. Product has signed off on a strength meter that scores passwords 0–100 based on leng...

150000 EXP 2000 Coins

Not started

Algorithms hard

Memoised Fibonacci

QuantumLabs is tutoring new devs on algorithmic complexity. They want a demo that shows the same problem solved naively and with memoisation...

320000 EXP 3000 Coins

Not started

Algorithms & Recursion hard

Mini SQL Engine

A consultancy has been handed a stack of CSV files from a legacy system and asked to deliver "a query layer". They cannot stand up a databas...

5000000 EXP 10000 Coins

Not started

Algorithms & Recursion hard

Recursive Descent Calculator

A spreadsheet vendor is building a formula engine and needs the maths layer first. Build a calculator that takes a string expression and ret...

1500000 EXP 8000 Coins

Not started

Data Validation hard

JSON Schema Validator

A SaaS platform takes JSON payloads from third-party integrators. Bad data has been silently corrupting their database for months. They want...

500000 EXP 5500 Coins

Not started

Data Visualisation hard

Sales Dashboard with Subplots

The CEO wants a single image containing four charts: total revenue per product (bar), daily revenue trend (line), payment method split (pie)...

3200000 EXP 7500 Coins

Not started

Graph Algorithms hard

Dijkstra Delivery Router

A regional logistics firm runs lorries between depots and is haemorrhaging fuel money on suboptimal routes. Their dispatcher just types in t...

2500000 EXP 9000 Coins

Not started

Object-Oriented Programming hard

Token-Bucket Rate Limiter

A fintech startup is launching a public API. Without rate limiting, one rogue client can crater the entire service — and the on-call enginee...

750000 EXP 6500 Coins

Not started

T-Level Task 4A hard

T-Level Task 4A: Full Recoats Solution

You are completing the full Pearson T-Level DPD Core Task 4A. The senior developer has already written code that lets users see the total in...

5000000 EXP 25000 Coins

Not started