我为朋友的祖母 Malti Devi 打造语音助手 Saarthi，用 Gemini API 让她打电话提问

This is a submission for the Hacktoberfest Weekend Challenge: Build for a Friend

What I Built

I built Saarthi for my friend Krishna Singh's grandmother, Malti Devi and SBI cutomer's . Talk about only Malti Devi here she lives alone, and she doesn't use a touchscreen phone. Most apps today assume you can tap, type and swipe, so for someone like her, solving even a small problem online is almost impossible.

Saarthi fixes that with just her voice. The AI agent actually calls her. If she wants to talk or ask something, she just speaks, and the agent understands her, finds the answer and talks back. There is no typing, no screen, no menus.

Demo

Code

PARAKH — परख

parakh (परख): "to assess, to gauge the true quality of something."

A transparent, deterministic, network-free candidate ranker for the Redrob × Hack2Skill Intelligent Candidate Discovery & Ranking challenge. It ranks the top 100 candidates out of 100,000 for the Senior AI Engineer — Founding Team role using an explainable panel of feature-engineered scorers — no embeddings, no ML model weights, and zero network calls during ranking.

Every score is fully decomposable and every line of the reasoning column is assembled only from real fields on the candidate's profile, so hallucination is impossible by construction.

TL;DR — reproduce the submission

Single command (local, requires JDK 17):

./gradlew bootJar && java -jar build/libs/parakh.jar <path-to>/candidates.jsonl ./submission.csv

Single command (Docker — no JDK needed, runs with the network physically off):

# 1. put the contest file at ./data/candidates.jsonl
mkdir -p data && cp <path-to>/candidates.jsonl ./data/

…

How I Built It

The backend is written in Java with Spring Boot. I used the Gemini API for the AI part: it converts her speech to text, works out what she is asking, and generates the reply. The reply then goes back to her as speech, so she hears the answer instead of reading it.

The interface works in both modes, text and speak, so anyone can use it either way.

Why Does Open Innovation Matter?

Most technology is built for people who can use a touchscreen. People like Malti Devi are left out, and they are often the ones who are alone and need help the most. Saarthi shows that a simple voice call can give them access to the same answers everyone else gets.

What Krishna Said

When I told Krishna about it, he was shocked. He was really happy, and it was a very emotional and enjoyable moment for him.

Thanks for giving me this opportunity