Bitcoin Multi-Sig Wallet Engineer (Freelance, PSBT/Descriptor Focus)

Evoke Solutions; United Kingdom; Remote; GBP 60,000 - 80,000; Full time

Job summary

Evoke Solutions, le premier cabinet de conseil en Bitcoin au Royaume-Uni, recherche un ingénieur Bitcoin pour construire une interface simple permettant la création de wallets. Ce rôle implique la collaboration sur des flux techniques innovants et la création d'une expérience utilisateur optimisée. Le projet est de 8 à 12 semaines avec un budget de £8,000 à £14,000.

Qualifications

• Expérience réelle avec PSBT.
• Familiarité avec BitcoinJS, Specter, Sparrow ou Electrum.
• Capacité à créer une interface utilisateur propre.

Responsibilities

• Création de flux de wallet 2-of-3.
• Intégration de hardware wallet (Trezor).
• Simulation de récupération et UX de signature.

Skills

BitcoinJS

PSBTs

Miniscript

multi-sig coordination

clean UX

Job description

Evoke Solutions is the UK’s first Bitcoin treasury consultancy for HNWIs and SMEs. We deliver secure, non-custodial, multi-sig wallet setups with inheritance, governance, and risk controls baked in.

We’re now building a simple interface to abstract away technical complexity for clients. Think: 2-of-3 wallet builder + Trezor integration + recovery test flow + PDF governance export.

We need a Bitcoin-native engineer with real PSBT experience, who can help us build the first version of this product fast, clean, and secure.

What You’ll Work On:

• 2-of-3 wallet creation flow (with descriptors + address validation)
• Hardware wallet integration (Trezor via WebUSB or HWI)
• PSBT signing coordination (offline + online flows)
• Recovery simulation and signing UX
• Exportable PDF of wallet structure & governance model
• (Optional) lightweight admin dashboard to track setups

You Should Know:

• BitcoinJS, Specter, Sparrow or Electrum experience
• PSBTs, Miniscript, or descriptor-based wallet design
• Familiarity with multi-sig coordination and hardware signing
• Clean UX thinking — we're not trying to build a bloated dashboard
• Bonus: experience with similar wallet projects

Budget & Rate:

• Fee Range: £8,000 – £14,000 ($10,000 – $18,000 USD)
• Engagement: 8–12 weeks freelance (extension possible)
• Paid in fiat