Job Title: Web3 Mobile Developer
Location:
Hybrid / Jakarta
Type:
Full-time
Company:
Xellar
About Xellar
Xellar is building the next generation of
wallet infrastructure
— from
embedded wallets, MPC technology, and Account Abstraction
to
DeFi banking and creator payment systems
. We empower users and builders to onboard seamlessly into Web3 through elegant, secure, and user-first experiences.
We're looking for a
Web3 Mobile Developer
who can bring world-class design taste and technical craftsmanship to our products — including
Xellar Wallet
,
Vault
, and
DevKit
.
Role Overview
You will be responsible for building and maintaining
Xellar's mobile applications
on both
iOS and Android
, ensuring smooth integration with blockchain networks, wallets, and APIs. You'll collaborate with our product, design, and backend teams to create mobile experiences that make Web3 accessible to everyone.
Responsibilities
- Develop and maintain
mobile apps using Flutter
, and native frameworks (
Swift
for iOS,
Kotlin/Java
for Android). - Integrate
Web3 functionalities
, including wallet connections, token balances, smart contract interactions, and on/off-ramp APIs. - Collaborate with designers to implement
beautiful, responsive, and minimalistic UI/UX
aligned with Xellar's brand. - Ensure
security best practices
in handling private keys, MPC flows, and blockchain data. - Optimize performance, stability, and scalability for mobile environments.
- Work with backend engineers to integrate RESTful and GraphQL APIs.
- Stay updated with emerging blockchain standards (EVM, AA, MPC, Layer2, etc.).
Requirements
Must-have skills:
- 3+ years of mobile app development experience (Flutter + native iOS/Android).
- Strong portfolio or apps published on App Store / Play Store.
- Experience with
Web3 libraries
such as web3dart, , wagmi, or equivalent. - Deep understanding of
blockchain fundamentals
(wallets, transactions, gas fees, signing, etc.). - Eye for
modern, clean design
and ability to translate Figma designs into production. - Familiarity with
secure key management
,
MPC
, or
AA
systems.
Bonus points:
- Experience with
Solana
,
EVM-compatible chains
, or
cross-chain protocols
. - Familiarity with
Firebase
,
Supabase
, or backend integration tools. - Past experience working on
DeFi
,
NFT
, or
crypto wallet
products. - Contributions to open-source Web3 projects.
What We Offer
- Work on
cutting-edge wallet infrastructure
powering Southeast Asia's Web3 ecosystem. - Flexible remote setup with async collaboration.
- Competitive compensation and
token incentives
. - Opportunity to shape the future of
Web3 finance and user experience
.