Devox Software

The client is an innovative global fintech leader behind USDT, the world’s largest and most widely used stablecoin.

We are looking for a React Native Developer with solid experience in blockchain/crypto/ wallets to help us build secure applications.

Responsibilities:

• Development
  Design, develop and maintain secure cross-platform mobile applications for iOS and Android using React Native (Expo).
  Work closely with designers to ensure the UI is clean, fast and accessible.
  Write clean, testable, and well-documented code, following best practices.
• Integration
  Integrate JavaScript SDKs, crypto wallet libraries, backend services and low-level native modules into mobile applications
  Work with Bitcoin / Web3 / blockchain APIs and wallet backends.
  Implement and manage wallet functionality: addresses, balances, transactions, seed phrases, private keys (with secure handling only).
• Collaboration
  Work closely with backend, product and design teams to deliver innovative crypto wallet and DeFi features.
  Participate in architecture discussions, code reviews and technical decision-making.

• Security & Reliability
  Implement mobile security best practices: secure storage, encryption, device integrity checks, protection from common attack vectors.
  Contribute to performance optimization, monitoring and reliability of mobile apps used at global scale.

   

Requirements:

• Deep experience with React and React Native (Expo)
• Strong knowledge of JavaScript and ES6+, and familiarity with modern front-end tooling.
• Experience with Redux and related React ecosystem fundamentals.
• Proven background in crypto or wallet development (Bitcoin, Web3, wallets, private keys or similar technologies).
• Understanding of decentralized systems and concepts like public/private keys, signing, transactions, and fees.
• Strong experience integrating REST APIs and WebSockets; real-time data handling.
• Experience with native modules (e.g. in C++) and low-level integrations.
• Hands-on experience in Swift or Objective-C (iOS) or Kotlin or Java (Android) for low-level mobile integrations.
• Familiarity with CI/CD pipelines for mobile deployments.
• Good understanding of mobile security: secure storage, key management, encryption, secure communication.
• Comfortable working in a remote, distributed team, communicating in English (written and spoken).

Nice to have:

• Experience with hardware wallets or secure elements.
• Knowledge of Layer 2 solutions, sidechains, or Lightning Network.
• Background in cryptography or security engineering.
• Experience with performance optimization and profiling for mobile apps

We’re looking for an experienced Clojure Developer to join our backend team responsible for a suite of critical applications that power core functionality of our website.

You’ll be working alongside a team of 3 Clojure developers who currently own and maintain applications responsible for:

• Page composition and rendering for article and channel pages
• Configuration management systems
• Job orchestration
• Data propagation from Oracle to Elasticsearch
• Various feeds and sitemaps
• A portion of our comments service

These applications are part of a backend monolith, hosted on-prem, and although primarily backend, they involve HTML templating, so a basic understanding of HTML is important.

While we are beginning to migrate away from this architecture, the transition will take time, and this role plays a key part in maintaining and evolving the current platform during this period.

Key Requirements:

• Strong experience with Clojure in production environments
• Solid backend development skills
• Familiarity with HTML templating
• Experience working on monolithic systems (bonus for on-prem experience)
• Ability to work independently and as part of a collaborative team

This is a great opportunity for someone who enjoys working with functional programming and wants to be part of a team handling essential and high-impact backend systems.

Note: Please apply for this position only if you have proven experience working with crypto, blockchain, or wallet development.

The client is an innovative global fintech leader behind USDT, the world’s largest and most widely used stablecoin.

We are looking for a React Native Developer with solid experience in blockchain/crypto/ wallets to help us build secure applications.

Responsibilities

• Design, develop and maintain mobile applications using React Native (iOS & Android)
• Integrate applications with Bitcoin / Web3 / blockchain APIs and wallet backends
• Work with wallet functionality: addresses, balances, transactions, seed phrases, private keys (never exposing them insecurely)
• Implement mobile security best practices: secure storage, encryption, device integrity checks, protection from common attack vectors
• Collaborate with backend, security, and product teams to design features for decentralized and crypto-enabled products
• Participate in code reviews, architecture discussions, and technical decisions
• Write clean, testable, well-documented code

Requirements

• 4+ years of experience in in React Native
• Strong knowledge of TypeScript / JavaScript and the React ecosystem
• Proven experience with blockchain / crypto / wallet applications
• Experience working with Bitcoin, Web3, wallets, private keys, or similar technologies
• Good understanding of mobile security: secure storage, key management, encryption, secure communication
• Understanding of decentralized systems and concepts like public/private keys, transactions, addresses, signing, gas/fees, etc.
• Experience integrating REST/WebSocket APIs and working with real-time data
• Comfortable working in a remote, distributed team, communicating in English (spoken and written)

Nice to have

• Experience with hardware wallets or secure elements
• Knowledge of Layer 2 solutions, sidechains, or Lightning Network
• Experience with performance optimization and profiling for mobile apps
• Background in cryptography or security engineering

The client is an innovative global fintech leader behind USDT, the world’s largest and most widely used stablecoin.

Note: Please apply for this position only if you have proven experience working with crypto, blockchain, or wallet development.

This role focuses on building high performance, intuitive mobile applications that integrate crypto wallet and DeFi functionality. You will work in a fast-paced environment alongside senior backend engineers, product managers and leadership to deliver secure cross-platform wallet experiences for a global audience.

Responsibilities

• Development
  Design, develop and maintain secure cross-platform mobile applications for iOS and Android using React Native (Expo).
  Work closely with designers to ensure the UI is clean, fast and accessible.
  Write clean, testable, and well-documented code, following best practices.
• Integration
  Integrate JavaScript SDKs, crypto wallet libraries, backend services and low-level native modules into mobile applications
  Work with Bitcoin / Web3 / blockchain APIs and wallet backends.
  Implement and manage wallet functionality: addresses, balances, transactions, seed phrases, private keys (with secure handling only).
• Collaboration
  Work closely with backend, product and design teams to deliver innovative crypto wallet and DeFi features.
  Participate in architecture discussions, code reviews and technical decision-making.

• Security & Reliability
  Implement mobile security best practices: secure storage, encryption, device integrity checks, protection from common attack vectors.
  Contribute to performance optimization, monitoring and reliability of mobile apps used at global scale.

   

Key Requirements

• Deep experience with React and React Native (Expo)
• Strong knowledge of JavaScript and ES6+, and familiarity with modern front-end tooling.
• Experience with Redux and related React ecosystem fundamentals.
• Proven background in crypto or wallet development (Bitcoin, Web3, wallets, private keys or similar technologies).
• Understanding of decentralized systems and concepts like public/private keys, signing, transactions, and fees.
• Strong experience integrating REST APIs and WebSockets; real-time data handling.
• Experience with native modules (e.g. in C++) and low-level integrations.
• Hands-on experience in Swift or Objective-C (iOS) or Kotlin or Java (Android) for low-level mobile integrations.
• Familiarity with CI/CD pipelines for mobile deployments.
• Good understanding of mobile security: secure storage, key management, encryption, secure communication.
• Comfortable working in a remote, distributed team, communicating in English (written and spoken).

Nice to Have

• Experience with hardware wallets or secure elements.
• Knowledge of Layer 2 solutions, sidechains, or Lightning Network.
• Background in cryptography or security engineering.
• Experience with performance optimization and profiling for mobile apps