If you plan to hire crypto wallet developers in India, test three things above all: how they handle private keys, how they think about security under attack and whether they can support several chains without cutting corners. A wallet is a security product with a user interface on top. The interview process should reflect that, and this guide gives you concrete tasks and red flags.
Short on time to run a hiring process? Tell us what your wallet needs to do and a senior engineer can scope it with you directly.
Why wallet engineering is its own specialism
A general blockchain developer can write a token contract. A wallet engineer has to protect secrets on devices you do not control, sign transactions for chains with different rules and explain to ordinary users what they are about to approve. One mistake in key storage or signing logic can empty every user's balance, and there is no bank to reverse it.
Skill area 1: key management
This is the heart of the role. Ask candidates to explain, without notes, how a key goes from generation to signature in the wallet they last built.
Fundamentals every candidate should know
- BIP-39 mnemonics, BIP-32 hierarchical deterministic derivation and BIP-44 paths across coins.
- Secure random number generation and why a weak source is fatal.
- Platform keystores: iOS Secure Enclave and Keychain, Android Keystore and StrongBox, and their limits.
- Encrypting secrets at rest, clearing them from memory and never logging them.
Advanced custody models
MPC and threshold signatures
For custodial or embedded wallets, multi-party computation splits signing across device, server and backup shares. Good candidates can explain key refresh, share recovery and what happens if a server share is compromised.
Smart accounts
ERC-4337 account abstraction and EIP-7702 enable social recovery, session keys, spending limits and sponsored gas. Ask how they would design recovery without reintroducing a single point of failure.
Skill area 2: security mindset
Look for people who think like attackers. Useful interview prompts:
- "A user reports funds sent to an address they never typed. What are the possible causes?" Strong answers mention clipboard malware, address poisoning, malicious dApps and compromised dependencies.
- "How would you stop users blind-signing a malicious approval?" Look for EIP-712 typed data, transaction simulation, allowance warnings and clear copy.
- "How do you protect the build pipeline?" Expect dependency pinning, lockfile review, signed releases and caution with third-party SDKs.
Also ask about root and jailbreak detection, certificate pinning, screenshot protection on seed screens and secure biometric gating. Candidates who have been through an external security review can describe findings and how they fixed them.
Skill area 3: multi-chain competence
Users expect one wallet for many assets. Each chain family behaves differently:
- EVM chains (Ethereum, Layer 2s, Polygon, BNB Chain): nonces, EIP-1559 fees, token approvals, ENS.
- Bitcoin: UTXO selection, fee estimation, SegWit and Taproot address types, PSBTs for hardware wallets.
- Solana: accounts model, recent blockhash expiry, SPL tokens and priority fees.
- Others such as TRON, Cosmos or TON, each with their own signing schemes.
Ask how they would add a new chain without destabilising existing ones. A plugin-style architecture with shared interfaces for balance, history, fee estimation and signing is a good sign. So is experience with RPC failover and indexers, because a wallet that shows the wrong balance loses trust instantly.
A practical take-home task
Skip trivia and set a small, realistic exercise, ideally paid and time-boxed:
- Generate an HD wallet from a mnemonic and derive addresses for one EVM chain and Bitcoin testnet.
- Store the secret using the platform keystore in a React Native or Flutter app.
- Build and sign a testnet transfer with a human-readable confirmation screen.
- Write a short note on threats they considered and what they would add for production.
The written note often tells you more than the code. In the review call, ask the candidate to walk through one decision they would change with more time, and how they would test key recovery on a lost or reset device. Engineers who have shipped real wallets talk readily about edge cases: interrupted backups, app reinstalls, OS upgrades that invalidate keystore entries and users who restore on a different platform.
Red flags when hiring
- Storing mnemonics in plain local storage or sending them to a server "for backup".
- Relying on forked wallet code nobody on the team fully understands.
- No tests around signing, fee calculation or address validation.
- Treating security review as optional before release.
How to hire crypto wallet developers in India: freelancer, in-house or partner
Freelancers can help with a narrow feature but rarely cover mobile, backend, security and multiple chains together. In-house hiring gives long-term ownership but takes time. A partner gives you an assembled senior team quickly. iJurug Soft, a Bangalore studio founded in 2018, offers blockchain alongside web and mobile app development among its services, with senior engineers on every engagement and fixed milestones from discovery to launch and long-term support. Our article on crypto wallet development in Bangalore explains how a full wallet project is structured, and if you also need contract engineers, see hiring smart contract developers. Engagement size depends on custody model, chains, platforms and compliance, so we quote per project.
Frequently asked questions
Custodial or non-custodial – which should we build?
Non-custodial wallets keep users in control and reduce your custody burden. Custodial or MPC-assisted wallets make recovery easier but bring regulatory obligations, including registration requirements in India.
Which framework is better for wallets, Flutter or React Native?
Both work. The deciding factors are your existing team, the crypto libraries you need and how much native keystore code you are prepared to maintain.
Should the wallet be audited?
Yes. Commission an independent security assessment of the app, backend and any contracts before public release.
How many engineers does a wallet need?
It varies with scope. A typical core covers mobile, backend and blockchain integration, with security review and QA alongside. Multi-chain or MPC custody adds specialist effort.
Ready to build your wallet team? Share your target chains, custody model and platforms through our project form or write to info@ijurugsoft.com, and a senior engineer will come back with questions and a staffing and milestone plan.