justt Tech Stack

AI-powered chargeback defense platform for payment processors and merchants

Financial Services Tel Aviv, Tel-Aviv 201–500 employees Founded 2020 Privately Held

Justt automates chargeback disputes using machine learning to generate tailored evidence across 500+ data points from payment networks, enrichment sources, and merchant records. The stack (Python, Node.js, NestJS, PostgreSQL, MongoDB, AWS) combined with integrations into PayPal, Stripe, Worldpay, Fiserv, and Adyen positions them as infrastructure-native rather than bolted-on. Hiring shows a sales-first trajectory (6 sales roles vs. 2 engineering) with decelerating velocity — a mature, revenue-focused org scaling GTM and customer implementation rather than core product iteration.

Tech Stack 19 technologies

Core StackTableau Python Stripe Adyen TypeScript Node.js NestJS MongoDB PostgreSQL AWS Salesforce Gong SQL PayPal Worldpay Fiserv Nx Puppeteer LinkedIn

What justt Is Building

◆Challenges

Managing chargebacks
Recovering lost revenue
Removing operational burden
Operational burden finance risk operations
Automating disputes
Dispute fee reduction
Reducing chargeback fraud
Chargeback management
Integrating with psps
Dispute timeline optimization

▲Active Projects

Dispute response content creation and optimization
New business opportunity strategy across industries
Psp integrations
Cross-segment recovery rate improvement initiatives
Technical implementation of justt's solutions for new clients
Critical platform features
Central data pipeline
Conference & event hunting
High-quality outbound prospecting
Gtm hiring pipeline

Hiring Activity

Decelerating20 roles · 4 in 30d

Department

Sales

Support

Product

Engineering

Seniority

Senior

Lead

Manager

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About justt

Justt builds an AI platform that defends merchants and payment processors against chargebacks by automatically constructing dispute responses. Founded in 2020 and headquartered in Tel Aviv, the company serves mid-market and enterprise payment ecosystems. The product integrates directly with major payment service providers (PayPal, Stripe, Worldpay, Fiserv, Adyen) and uses weak-spot detection and A/B testing to optimize win rates across dispute volumes. The 201–500 person team operates across Israel, the UK, and the US, with active projects spanning PSP integrations, dispute content optimization, cross-segment recovery strategies, and technical client implementations.

HeadquartersTel Aviv, Tel-Aviv

Company Size201–500 employees

Founded2020

Hiring MarketsUnited Kingdom, United States, Israel

Frequently Asked Questions

What payment processors does Justt integrate with?

Justt integrates with PayPal, Stripe, Worldpay, Fiserv, and Adyen — covering the majority of enterprise payment processing infrastructure.

What tech stack does Justt use?

Python, TypeScript, Node.js, NestJS, PostgreSQL, MongoDB, AWS, Tableau, and Puppeteer. The stack emphasizes backend automation and data pipeline work.