Software Engineer (iOS) - Performance Optimization
Singapore
Full time
Office
Compensation is not specified
Role
iOS Developer
Description
About OKX:
Founded in 2017, OKX is a leading exchange platform for cryptocurrency spot and derivatives trading. Utilizing blockchain technology, OKX offers a wide range of innovative products, solutions, and trading tools that have reshaped the financial ecosystem. With a global user base of over 20 million individuals across 180 regions, OKX aims to provide a user-friendly platform that enables everyone to explore the world of crypto. Furthermore, OKX Insights, the research arm of OKX, stays ahead of cryptocurrency industry trends. With a commitment to innovation, OKX envisions a future of financial access driven by blockchain and decentralized finance.
About the team:
As a mobile software engineer, you will be responsible for building and maintaining the core OKX mobile application that serves millions of daily active users. Collaborating with design, product, and other engineering teams, you will identify customer needs and deliver high-quality new features through fast iterations. This position provides an opportunity to gain comprehensive knowledge of cryptocurrency mobile applications, including trading, asset management, and wallets.
Responsibilities:
- Develop mobile infrastructure and tools to optimize engineering efficiency
- Analyze and optimize UI and infrastructure application code for enhanced performance
- Create and maintain reusable iOS app components
- Collaborate with product engineering teams to offer technical solutions and implement best practices
- Enhance project structure and workflow to improve engineering productivity, efficiency, and quality
- Drive architecture innovations to support world-class mobile app development
Requirements:
- Bachelor's degree or equivalent practical experience
- Minimum of 3 years of industry experience in iOS development
- Demonstrated experience in building and releasing sophisticated iOS app products with frequent iteration
- Proven track record of optimizing app performance, reducing memory usage, and minimizing package size
- Strong understanding of design patterns and principles, with extensive knowledge of iOS tech stack
- Proficiency in Objective-C, Swift, C/C++, and tools like Xcode and instruments
- Deep knowledge of iOS SDK and ability to create scalable, dynamic, and high-performance UI components
- Familiarity with remote APIs, concurrency, layouts, transitions, animations, client-side persistence, and architectural patterns in mobile apps
Nice-to-have:
- Experience working in complex, cross-functional, or cross-business projects within a matrix organization
- Background in mobile architecture/infrastructure team with in-depth knowledge of related tech stack
- Expertise in sub-engineering areas such as performance optimization, toolchain, automated testing, and design patterns
- Excellent communication skills, both within a team and in delivering impactful business outcomes autonomously
Skills Required
OKX
Website
www.okx.comCompany size
Not specified
Location
United States
Description
Not specified
amirhossein ashofteh
Remote Translation – English to Multilingual
Washington D.C., USA
Washington D.C., USA
Full time
Remote
Hello,
I’m a multilingual translator available for remote collaboration.
My primary working language is English, and I translate from English into:
• Persian (native)
• German
• French
• Arabic
• Italian
• Portuguese
I deliver accurate, natural translations adapted to the target audience, not word-for-word output.
I’m detail-oriented, reliable, and comfortable working with remote teams on ongoing translation tasks.
My background in web and creative fields allows me to handle website and app content effectively, ensuring translations fit properly within layouts and user interfaces.
I’m happy to complete a short test translation if required.
Payment in crypto (USDT) through LaborX works perfectly for me.
Looking forward to your reply.
I’m a multilingual translator available for remote collaboration.
My primary working language is English, and I translate from English into:
• Persian (native)
• German
• French
• Arabic
• Italian
• Portuguese
I deliver accurate, natural translations adapted to the target audience, not word-for-word output.
I’m detail-oriented, reliable, and comfortable working with remote teams on ongoing translation tasks.
My background in web and creative fields allows me to handle website and app content effectively, ensuring translations fit properly within layouts and user interfaces.
I’m happy to complete a short test translation if required.
Payment in crypto (USDT) through LaborX works perfectly for me.
Looking forward to your reply.
Payment in Crypto
Lumixion.io
Frontend Web3 Engineer | React | Solidity, Ethereum, Solana
Remote, USA
Remote, USA
Full time
Remote
About the RoleWe are seeking a React Web3 Developer to build decentralized applications and integrate smart contracts across multiple blockchain platforms. Candidates may have experience with Solana, Ethereum, Solidity, or similar smart contract technologies.ResponsibilitiesDevelop and maintain Web3 applications using ReactIntegrate and interact with smart contracts on various blockchainsImplement wallet connections and on-chain interactionsCollaborate with product and blockchain teamsWrite clean, secure, and well-documented codeRequirementsStrong experience with React and modern frontend developmentExperience with any smart contract platform (Solana, Ethereum, Solidity, or similar)Familiarity with Web3 libraries (ethers.js, web3.js, wagmi, etc.)Solid understanding of blockchain fundamentals and dApp architectureAbility to work independently with strong communication skillsPreferredExperience with DeFi, NFT, or multi-chain applicationsFull-stack Web3 experienceHiring ProcessTechnical TaskShortlisted candidates will be given access to a public repository. The task is to:Review the codebase and suggest improvements and optimizationsShare recommendations and best practices based on the existing implementationInclude screenshots of the terminal and browser as references where applicableSubmissions must be shared as:A Google Docs link, orA PDF documentTechnical Interview with CTOA detailed technical interview will be conducted with our CTO. Topics will include:In-depth discussion of the candidate’s understanding of the reviewed codebaseApproach to development challenges and best practicesCultural and Work Environment Interview with CEOThe final stage involves a meeting with the CEO to evaluate:Cultural fit within the companyWork ethic and attitudeAlignment with company values and visionExpectations regarding work environment and team collaboration
Payment in Crypto
XanaNetworo
Crypto Outreach Hunter – High Commission (Remote)
Full time
Remote
XanaNetwork (@xananetwork) is hiring 5–8 outreach hunters. We just relaunched — same core team with a track record of multi-hundred-million caps and six-figure holder bases. Your job:• Send 300–600 high-quality cold DMs per day on Twitter (DexScreener, Pump.fun, new launches)• Get warm replies → we close Pay (performance-first):• $800–$1,200 USD monthly base• + $1,500–$4,000 bonus per signed client• Top hunters clear $8k–$15k+/mo on commission• Paid trial $100 flat — first 8 who hit 5+ warm replies get hired No experience needed — we’ll train hungry people. Apply → DM @mainnetmike on Twitter with:1. How many DMs you can send daily2. Why you want the role Hungry & coachable only.
Payment in Crypto
John Paulson
Data Analyst
Full time
Remote
Bachelor’s degree in Data Science, Statistics, Mathematics, Computer Science, Economics, or a related quantitative field.Strong analytical and problem-solving skills with the ability to interpret complex datasets.Proficiency in SQL and experience working with relational databases.Solid knowledge of Python (Pandas, NumPy) or R for data analysis and automation.Experience building dashboards or visualizations using Tableau, Power BI, Looker, or similar tools.Understanding of statistical methods, A/B testing, and data modeling techniques.Ability to clearly communicate insights to both technical and non-technical stakeholders.Familiarity with Web3, blockchain metrics, on-chain data, and crypto ecosystems is a strong advantage.Ability to work independently, manage multiple tasks, and deliver on deadlines.Good written and spoken English.
Peeter Luik
Software Developer
Part time
Remote
I’m actively looking for a native Russian speaker who can expertly conduct or participate in job interviews—especially those requiring strong communication, technical understanding, and professional presence. This person should feel at ease discussing software engineering, or related topics, while also being able to assess a candidate’s clarity, depth, and overall fit. If you’re a fluent Russian speaker with the confidence and experience to shine in a technical interview setting, I’d be excited to connect and explore the opportunity with you.
Payment in Crypto