Zondax AG

Zondax AG is a blockchain engineering company founded in 2017 and headquartered in Zug, Switzerland. The company specializes in building back-end technical solutions for the blockchain ecosystem, focusing on three core pillars: Cryptography & Security, Data & Integration, and Core & Protocol Engineering. With a growing international team of experienced professionals, Zondax has established itself as a leading engineering services provider in the blockchain space, having successfully delivered work across more than 50 blockchain protocols.

Core Products and Services

Zondax is widely recognized as the leader in hardware wallet application development, having built over 50 Ledger applications for major blockchain networks including Cosmos, Tezos, Zcash, Filecoin, Polkadot, Internet Computer (ICP), Centrifuge, and many others. Their hardware wallet expertise extends to both Ledger and Trezor devices, and includes the Zondax Hub platform for installing asset apps to Ledger devices.

The company also develops Trusted Execution Environment (TEE)-based remote signers, providing secure alternatives to standard validators for networks such as Kusama and Polkadot. Their protocol engineering services cover the design, development, and optimization of blockchain protocols, including smart contract libraries, VM SDKs, and interoperability adapters.

Beryx is Zondax's flagship data infrastructure product — a platform specializing in real-time and historical data processing for the Filecoin ecosystem. It provides a public API for indexing and exposing Filecoin blockchain data including transactions, multisig account interactions, and fee details, alongside a blockchain explorer for developers and network users.

Key Strengths

• Leader in Ledger hardware wallet app development with 50+ applications shipped
• Deep expertise in cryptographic libraries and signing tools
• On-premises data center in Switzerland (fast, secure, GDPR-compliant) running full archival nodes
• Proficiency across multiple programming languages including Rust, Go, C, C++, TypeScript, AssemblyScript, Python, and Julia
• Collaboration portfolio spanning 50+ blockchain projects including Zcash, Avalanche, Polkadot, ICP, Cosmos, Filecoin, Tezos, and Starknet
• Natively remote team with global talent

Notable Clients and Projects

Zondax has collaborated with leading blockchain organizations including Protocol Labs (Filecoin), Web3 Foundation (Polkadot/Kusama), Dfinity (Internet Computer), Ledger, Trezor, Zcash Foundation, Cosmos, Tezos Foundation, Avalanche, Algorand, and dozens more. Their open-source contributions include the Zemu testing framework for Ledger apps (widely adopted across the Ledger ecosystem including Ethereum app), Filecoin Solidity Libraries, FVM AssemblyScript SDK, and the Beryx blockchain explorer.

Why Choose Zondax

Zondax brings unmatched depth of experience in blockchain protocol-level engineering. Their track record across 50+ protocols, combined with proprietary tooling, an on-premises GDPR-compliant data center, and a team fluent in low-level systems programming, makes them the go-to partner for technically demanding blockchain engineering challenges. Their innovation lab continuously produces new products and tools that advance the wider Web3 developer ecosystem.