◆ Gentoo Logic · Modeling Warehouse

FinTech · AI architecture

23 FinTech companies — how they build with AI

How FinTech companies build with AI — which foundational models they run and how directly, ranked by proximity to the model. Avg Foundation Proximity Score 42/100.

Native 2Direct API 9Cloud-hosted 2Middleware 0

Intuit

FinTech · AWS · Native (own / self-hosted weights)

Intuit Assist runs on its own GenOS platform with partner LLMs underneath.

Stripe

FinTech · AWS · Native (own / self-hosted weights)

AWS-based payments platform built on a large MongoDB deployment fronted by an in-house sharding/transaction layer (DocDB). Radar fraud detection is in-house ML; a payments foundation model was trained on transaction data.

Block

FinTech · AWS · Direct API

Cash App Money Bot + Square Managerbot run on Anthropic Claude (Sonnet) and OpenAI GPT via Block’s open-source goose agent framework (Claude is goose’s default on Databricks).

Brex

FinTech · AWS · Direct API

AWS-based corporate-card/spend platform on PostgreSQL with Kafka eventing. Brex Assistant uses OpenAI/Anthropic over its own financial data and an agentic spend layer.

Coinbase

FinTech · AWS · Direct API

AWS-native crypto exchange on MongoDB/PostgreSQL with DynamoDB for high-throughput paths; strong HSM/key-management and on-chain infra. Uses in-house risk ML and LLMs for support.

Dave

FinTech · AWS · Direct API

Neobank; in-house underwriting ML plus OpenAI for support/assistant.

Klarna

FinTech · AWS · Direct API

AWS-native BNPL that built its customer-service assistant directly on OpenAI, reportedly handling two-thirds of chats.

Mercury

FinTech · AWS · Direct API

Startup banking; AI assist on OpenAI over transaction data.

Ramp

FinTech · AWS · Direct API

AWS-native finance-automation/corporate-card platform on PostgreSQL, AI-first in positioning: LLM agents (OpenAI/Anthropic) automate expense categorization, approvals and procurement over transaction data.

Revolut

FinTech · GCP · Direct API

In-house risk ML plus OpenAI for support/assistant features.

SoFi

FinTech · AWS · Direct API

Digital finance; in-house risk ML plus OpenAI for member support/assistant.

Chime

FinTech · AWS · Cloud-hosted (Bedrock/Vertex/Azure)

Chime runs a proprietary fintech platform on AWS, using S3, Airflow and Spark-based data pipelines that write to Snowflake and then propagate to MySQL and DynamoDB for operational and analytics use.[1][5] AI capabilities, including call summarization, are integrated via Amazon Bedrock into this core architecture rather than being a standalone LLM-native product.[5]

Robinhood

FinTech · AWS · Cloud-hosted (Bedrock/Vertex/Azure)

Cortex investing assistant (Digests) runs on Amazon Nova via Bedrock, chosen for ~80% lower per-token cost; core trading/risk stays in-house ML. Now also exposes agent-trading APIs.

Adyen

FinTech · On-Prem · Off the LLM map (in-house non-LLM ML)

Unusually for its scale, runs its own data centers (not a hyperscaler) on a single Java platform over PostgreSQL for full control of the payment path. RevenueProtect fraud scoring is in-house ML.

Affirm

FinTech · AWS · Off the LLM map (in-house non-LLM ML)

BNPL underwriting on large in-house risk ML; off the foundational-LLM map at the core.

Carta

FinTech · AWS · Off the LLM map (in-house non-LLM ML)

Carta operates a proprietary, cloud-based equity and private capital management platform, most likely hosted on AWS using a relational database such as PostgreSQL. Public information focuses on product capabilities rather than disclosing detailed production architecture, so deeper specifics cannot be reliably verified.

Checkout.com

FinTech · Hybrid · Off the LLM map (in-house non-LLM ML)

Global payments processor on its own infrastructure; large in-house fraud/risk ML; off the foundational-LLM map at the core.

Marqeta

FinTech · AWS · Off the LLM map (in-house non-LLM ML)

Card-issuing platform; in-house risk ML; off the foundational-LLM map at the core.

Nubank

FinTech · AWS · Off the LLM map (in-house non-LLM ML)

Heavy in-house ML (acquired Hyperplane); off the LLM map at the core.

PayPal

FinTech · Hybrid · Off the LLM map (in-house non-LLM ML)

Massive in-house fraud/risk ML on its own infrastructure; off the LLM map at the core.

Plaid

FinTech · AWS · Off the LLM map (in-house non-LLM ML)

AWS-hosted financial-data network connecting apps to banks; MongoDB + PostgreSQL behind a heavy data-normalization and anti-fraud ML layer. AI is in-house risk/identity models, not a public LLM brand.

Wealthfront

FinTech · AWS · Off the LLM map (in-house non-LLM ML)

Automated investing on in-house quantitative ML; off the foundational-LLM map at the core.

Wise

FinTech · AWS · Off the LLM map (in-house non-LLM ML)

In-house ML for FX/fraud; no core foundational-LLM dependency.

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