The technology directory.

React

Component-based UI library we use for web applications, dashboards and design systems.

Next.js

React framework for server-rendered, fast, SEO-friendly web applications and sites.

Vue.js

Progressive JavaScript framework for approachable, reactive web interfaces.

Angular

Opinionated TypeScript framework common in enterprise web applications.

Svelte

Compiler-based UI framework producing small, fast bundles.

JavaScript

The language of the web — used across browsers, servers and tooling.

TypeScript

Typed superset of JavaScript and our default language for web and Node.js code.

Tailwind CSS

Utility-first CSS framework for consistent, maintainable design systems.

Node.js

JavaScript runtime for APIs, real-time services and full-stack TypeScript backends.

NestJS

Structured Node.js framework for scalable, maintainable server applications.

Express

Minimal Node.js web framework for lightweight APIs and services.

Python

The primary language for AI, machine learning, data engineering and many APIs.

Django

Batteries-included Python web framework for robust, secure applications.

FastAPI

High-performance Python API framework with type-driven validation.

Flask

Lightweight Python micro-framework for small services and APIs.

Java

Proven platform for high-throughput, mission-critical enterprise and financial systems.

Spring Boot

Java framework for production-ready microservices and enterprise applications.

Go (Golang)

Fast, simple compiled language for infrastructure, payments and blockchain services.

Rust

Memory-safe systems language for high-performance and blockchain engineering.

PHP

Widely deployed server language behind many web platforms.

Laravel

Elegant PHP framework for full-featured web applications.

.NET

Microsoft's cross-platform platform for enterprise applications and services.

C#

Modern, typed language for .NET enterprise, cloud and game development.

Flutter

Cross-platform UI toolkit for high-quality iOS and Android apps from one codebase.

React Native

Cross-platform mobile framework using React and native components.

Swift

Apple's language for native iOS, iPadOS and macOS applications.

SwiftUI

Declarative UI framework for Apple platforms.

Kotlin

Modern language for native Android apps and JVM services.

Android

The world's most widely used mobile platform.

iOS

Apple's mobile platform, known for security and premium users.

Artificial Intelligence

The broad discipline behind our generative AI, agents, machine learning and perception work.

Large Language Models

Foundation models for text, reasoning and tool use — hosted and open-weight.

OpenAI Models

Hosted frontier models accessed via API for language, vision and speech tasks.

Retrieval-Augmented Generation

Grounding LLM answers in your documents with retrieval, citations and permissions.

AI Agents

LLM-driven systems that plan, call tools and complete multi-step tasks.

Vector Databases

Databases for similarity search over embeddings — the retrieval layer of RAG.

Embeddings

Numerical representations of meaning used for search, clustering and retrieval.

Fine-Tuning

Adapting models to specific domains, formats and tasks.

AI Inference & Serving

Serving models efficiently — latency, throughput, scaling and cost.

MLOps

Practices and tooling for reproducible, monitored, continuously improved models.

Computer Vision

Models that interpret images and video for detection, recognition and inspection.

Natural Language Processing

Techniques for classifying, extracting and understanding text at scale.

Speech AI

Speech recognition and synthesis for voice agents, transcription and analytics.

Ethereum

The leading smart contract platform and settlement layer for DeFi, tokenization and L2s.

BNB Chain

EVM-compatible network with low fees and a large retail user base.

Polygon

Ethereum scaling ecosystem used for payments, tokenization and consumer apps.

Solana

High-throughput blockchain for payments, trading and consumer applications.

Arbitrum

Ethereum optimistic rollup with deep DeFi liquidity and EVM equivalence.

Optimism

Optimistic rollup and OP Stack framework powering many Layer 2 networks.

Avalanche

Fast-finality platform with customisable subnet/L1 architecture for institutions.

Base

OP Stack Layer 2 with strong consumer and payments adoption.

TRON

Network with high stablecoin transfer volume, especially for payments and remittance.

XRP Ledger

Ledger designed for payments, with native DEX and tokenization features.

Hyperledger

Open-source permissioned blockchain frameworks for enterprise consortiums.

Solidity

The primary language for EVM smart contracts.

Vyper

Pythonic, security-focused smart contract language for the EVM.

Hardhat

JavaScript/TypeScript development environment for EVM smart contracts.

Foundry

Fast Solidity-native toolkit for testing, fuzzing and deployment.

Remix

Browser-based IDE for Solidity development and experimentation.

OpenZeppelin

Widely used library of audited smart contract components.

Ethers.js

JavaScript library for interacting with Ethereum and EVM networks.

Web3.js

Long-standing JavaScript library for Ethereum interaction.

Viem

Type-safe, lightweight TypeScript library for EVM interactions.

Wagmi

React hooks for wallet connection and contract interaction.

WalletConnect

Open protocol connecting wallets to decentralised applications.

IPFS

Content-addressed decentralised storage for files and metadata.

The Graph

Indexing protocol for querying blockchain data via GraphQL subgraphs.

Chainlink

Decentralised oracle network for price feeds, automation and cross-chain messaging.

Blockchain Oracles

Mechanisms that bring external data on-chain — and a major security consideration.

Account Abstraction

Programmable smart accounts enabling gasless, recoverable, policy-controlled wallets.

ERC-4337

Account abstraction standard using UserOperations, bundlers and paymasters.

ERC-20

The standard for fungible tokens, including most stablecoins.

ERC-721

The standard for unique non-fungible tokens.

ERC-1155

Multi-token standard for fungible and non-fungible tokens in one contract.

ERC-4626

Tokenized vault standard for yield-bearing positions.

ERC-721A

Gas-optimised ERC-721 implementation for batch minting.

ERC-1400

Security token standard family with partitions and transfer restrictions.

ERC-3643

Permissioned token standard with on-chain identity and compliance modules.

ISO 20022

The global standard for rich financial messaging in payments and reporting.

ISO 8583

The messaging standard for card transaction authorisation and clearing.

PCI DSS

Security standard for systems handling payment card data.

Open Banking APIs

Standardised APIs for account data sharing and payment initiation with consent.

Double-Entry Ledgers

The accounting foundation of every financial product we build.

Amazon Web Services

The broadest cloud platform — our most frequent target for production workloads.

Microsoft Azure

Enterprise cloud with deep Microsoft ecosystem and identity integration.

Google Cloud

Cloud platform strong in data, analytics, AI and Kubernetes.

Cloudflare

Edge network for CDN, security, DNS and edge compute.

NGINX

High-performance web server, reverse proxy and load balancer.

Linux

The operating system underpinning cloud, containers and blockchain nodes.

Docker

Container runtime and tooling for packaging applications consistently.

Kubernetes

Container orchestration platform for running services at scale.

Terraform

Infrastructure as code across clouds and services.

Ansible

Agentless configuration management and automation.

GitHub Actions

CI/CD integrated with GitHub repositories.

GitLab CI

Integrated CI/CD within GitLab.

Jenkins

Extensible open-source automation server common in enterprises.

Argo CD

GitOps continuous delivery for Kubernetes.

Prometheus

Open-source metrics collection and alerting.

Grafana

Visualisation and dashboards for metrics, logs and traces.

PostgreSQL

Our default relational database — reliable, extensible and strongly consistent.

MySQL

Widely used open-source relational database.

MongoDB

Document database for flexible schemas and rapid development.

Redis

In-memory data store for caching, queues, rate limiting and real-time features.

SQLite

Embedded relational database for mobile, edge and local-first apps.

MariaDB

Community-developed MySQL-compatible relational database.

DynamoDB

AWS serverless key-value and document database at any scale.

Firestore

Google's serverless document database with real-time sync.

Elasticsearch

Search and analytics engine for full-text search and logs.

OpenSearch

Open-source search and analytics suite.

ClickHouse

Columnar database for fast analytics over large datasets.

Snowflake

Cloud data warehouse for analytics and data sharing.

BigQuery

Google's serverless data warehouse.

Supabase

Postgres-based backend platform with auth, storage and real-time.

Apache Kafka

Distributed event streaming platform for high-throughput, durable event pipelines.

RabbitMQ

Message broker for task queues and flexible routing.

Redis Streams

Lightweight log-based streaming inside Redis.

Apache Spark

Distributed processing for large-scale data engineering and ML.

Apache Airflow

Workflow orchestration for data pipelines.

dbt

SQL-based transformation framework for analytics engineering.

ETL

Extract, transform, load — moving and shaping data between systems.

ELT

Extract, load, transform — transforming data inside the warehouse.

Data Warehousing

Central, modelled data for analytics, reporting and AI.

Data Lakes

Scalable storage for raw and semi-structured data at low cost.

Real-time Analytics

Analytics on streaming data for live dashboards and alerts.

Event-driven Architecture

Architectural style where services communicate through events.

OWASP

Open security guidance including the Top 10, ASVS and API Security Top 10.

HashiCorp Vault

Secrets management, dynamic credentials and encryption as a service.

Keycloak

Open-source identity and access management with SSO, OIDC and SAML.

MPC Cryptography

Multi-party computation for distributed key management and signing.

GraphQL

Query language for APIs that lets clients request exactly the data they need.

gRPC

High-performance RPC framework with protobuf contracts.

OpenAPI

Specification format for describing REST APIs.

WebSockets

Persistent bidirectional connections for real-time communication.

OAuth 2.0 & OIDC

Standards for delegated authorisation and authentication.