Self-directed project
Frontend Engineering with Prediction Game
Junior Front-End Engineer · Software Engineering · July 2026
A ProoV case study · educational project, not employment
Built a complete World Cup prediction game end to end: rendered the fixture board with score inputs, implemented exact/result-only scoring, computed team strengths from real match data, and used those strengths in a Poisson-style house bot. Also shipped a persistent ranked leaderboard that survives reloads and deployed the finished game to a live https URL.
Graded against
- Scoring engine correctness30%
- Prediction model genuinely from real data25%
- Game completeness and leaderboard soundness25%
- Shipped and shareable: live deployed URL20%
Passed · pass mark 60/100
What stood out6
- Implemented the exact scoring rule, including the draw-vs-draw edge case returning 2
- Computed team attack/defense strengths from the embedded real-results sample instead of hard-coding a stub
- Built a bot predictor that uses both teams' strengths through a Poisson-style lambda calculation
- Persisted and reloaded leaderboard rows under one localStorage key, then sorted them descending
- Leakage-Free Feature Engineering
- Honest Model Evaluation
The work I submitted17 tasks
9 tasks · 11 lines · JavaScript, HTML · 8 written answers · 705 words
- Lab Orientation679 characters
- Act1 Fixtures FormJavaScript · 3.8k characters
- Act2 Scoring FunctionJavaScript · 2.9k characters
- Act3 Compute Strength108 characters
- Act3 House Bot108 characters
- Example Save Rank ReadonlyHTML · 3.5k characters
- Act4 LeaderboardJavaScript · 2 lines
- Act5 Assemble2 lines
- Final Submission95 characters
- Lab Orientation68 words
- Act1 Fixtures Form143 words
- Act2 Scoring Function116 words
- Act3 Compute Strength1 word
- Act3 House Bot1 word
- Example Save Rank Readonly130 words
- Act4 Leaderboard138 words
- Act5 Assemble108 words
Summarised on purpose — the submitted code and writing stay private so this page cannot be reused as an answer key. The full submission sits behind the verified certificate.