2 131 Crypto & Blockchain jobs in Vietnam

Job Description

• Design, develop, and deploy smart contracts on Solana (using Rust and Anchor if appropriate) to manage game rewards and payment logic.
• Build and maintain backend services (preferably FastAPI) to connect the game server with the blockchain — including transaction signing, tracking, and handling webhooks or callbacks.
• Integrate Solana/SPL Token wallets, ensuring secure and efficient reward transfer processes.
• Implement robust security measures to prevent replay attacks and double spending, and ensure proper access control, rate limiting, and logging.
• Prepare technical documentation, and support QA/UAT testing and post-launch maintenance.
• Collaborate closely with the Game and Frontend teams to ensure smooth gameplay and rapid resolution of production issues.

Job Requirements
MUST HAVE SKILLS:

• Solana: Proven experience deploying production-ready smart contracts.
• Rust: Skilled in writing, optimizing, and auditing smart contracts.
• FastAPI (or equivalent): Experience building off-chain services interacting with the blockchain.
• Strong communication skills with fast response time to client messages.
• Proactive use of AI tools (e.g., ChatGPT, Copilot) for debugging, research, and problem-solving.

NICE TO HAVE

• Experience with Anchor Framework for Solana.
• Familiarity with game-related blockchain integration and reward systems.

Benefits
Competitive Salary and Brilliant Health Benefits

• Attractive salary (13th-month salary, salary review twice/year) and project bonus
• Bonus programs for candidate referral, technical article writing
• Interest-free loan support for personal plan
• Allowance for sickness, maternity, paternity and periodic health examination
• PVI health care program
• The staff of the quarter and year reward

Progressive and Fun Working Environment

• A professional English-speaking working environment with Agile – Scrum model
• Hybrid Working Model: Flexible working time and WFH support.
• Surrounded with friendly, open-minded, young and supportive colleagues
• Annual company trip and regular team-building parties, party celebration (Christmas, Birthday, Mid-autumn,.), Sports clubs (football, badminton, swimming …)

Valuable Training

• Sponsor examination fee for professional certificates (AWS, Azure, IELTS, PMP, Scrum Master,.)
• Sponsor fee for joining any technical training sessions and courses.
• Free English workshops

1. INTRODUCTION
a. About Fetch:

Our mission is to offer Vietnam's most talented technologists a platform to connect with some of the world's leading tech companies and build their expertise on a global scale. Over 4 years, Fetch has built a good reputation and is trusted by many Vietnamese and foreign companies; And Fetch will continue its good work to bridge the divide between the World and the Vietnam Tech sector.

b. About Client:

Our client has stood at the forefront of nurturing developer relationships and spearheading marketing efforts, ensuring tech products reach developers globally.

Providing comprehensive support in developer relations and marketing for corporations, government bodies, and nonprofits, we've partnered with over 250 esteemed entities such as Meta, Google, Mastercard, Intel, Nvidia, IBM, Circle, Polkadot, among others.

With a network exceeding 300,000 developers, our client has pioneered the organization of hackathons, online contests, acceleration initiatives, gatherings, and marketing strategies for developers in more than 100 cities worldwide.

2. RESPONSIBILITIES

• Develop scalable and high-performance front-end and back-end systems, working across the stack with technologies like and
• Collaborate closely with product managers and designers to align technical solutions with business needs.
• Write robust, maintainable code and implement best practices around testing, CI/CD, performance, and reliability.
• Design and implement distributed systems and microservices with event-driven architecture using Kafka and gRPC.
• Guide other engineers through code reviews, technical planning, and knowledge sharing.
• Take part in monitoring, incident response, and performance tuning across the stack.
• Actively participate in sprint planning, retrospectives, and other Agile ceremonies to continuously improve team practices.

3. REQUIREMENT

• Bachelor's degree in computer science or a related field.
• 5 years of practical experience working with
  
  and its frameworks, including Express and , and 
  
• Experience in the blockchain industry or in developing products related to blockchain technology .
• Strong expertise in designing, implementing, and maintaining 
  microservices
   architectures.
• Proficiency in 
  MySQL
  , 
  Elasticsearch
  , and 
  Redis
  .
• Solid hands-on experience with 
  Kafka
  , 
  gRPC
  , and 
  event-driven systems
  .
• Deep understanding of 
  data structures
  , 
  distributed systems
  , and system design principles.
• Advanced knowledge of Redis and MySQL.
• Ability to write optimized, high-quality, and testable code, adhering to best practices.
• The capability to take ownership of features, work independently, and proactively contribute.
• A collaborative approach with a willingness to learn and work effectively as part of a team.
• Good English communication – in both writing and speaking.

4. WHY YOU'LL LOVE WORKING HERE

Being a Senior Fullstack Developer at Fetch Technology, you will experience a youthful, flexible and creative work environment:

• MacBook or high-end laptop for working.
• Attractive salary and annual salary review.
• Working in a professional, friendly, well-equipped environment both with foreigners and Vietnamese.
• With extensive on-the-job training, you will always have a chance to work with new emerging technologies.
• 12 days annual leave per year.
• 13th-month salary.
• Enjoy diversified activities: Free snacks, Weekly and Monthly Team-building, Company trips, Play Games (PlayStation, Board games), and Play Sports (Football, Badminton.).

5. WORKING HOURS & LOCATION

• Working hours: From 9 AM - 6 PM, Monday to Friday.

• Location:

• HN: 13th Floor, TTC Building - No.19, Duy Tan Street, Dich Vong Hau Ward, Cau Giay District, Hanoi.

Position: QA Tester

Contract Type: Contractor (3–6 months)

Salary: Upto $1500

Location: Le Van Luong, Thanh Xuan, Hanoi

Work Mode: Full-time, Hybrid

Working Hours: 1PM- 5:30PM (on-site), 6:30PM - 10PM (remote)

About Us

Founded in 2020, our company is home to 80+ skilled engineers specializing in blockchain, virtual/augmented reality, and AI. We collaborate with clients from Hong Kong, Japan, Singapore, the US, and more—helping them build cutting-edge products such as crypto trading platforms, launchpads, securities tokenization offerings, e-wallets, and NFT marketplaces. We are trusted by global brands including Ubisoft, Hedera, and Aptos.

We are seeking a talented and detail-oriented
QA Software Engineer
to join our team. In this role, you will ensure the quality and reliability of our software products through comprehensive testing and quality assurance processes.

Key Responsibilities

• Design, develop, and execute manual and automated test cases to thoroughly evaluate software functionality, performance, and usability

• Review requirements, specifications, and technical design documents to provide timely and meaningful feedback

• Collaborate with developers, product managers, and other stakeholders to identify system requirements and resolve issues

• Plan and coordinate testing activities, including estimating, prioritizing, and scheduling QA tasks

• Identify, document, and track bugs and defects using appropriate tools and methodologies

• Develop and maintain test plans, test scripts, and other QA documentation

• Perform various types of testing, including functional, regression, performance, and security testing 2

• Analyze test results and provide comprehensive reports to the development team and management

Qualifications

• Required:

o Bachelor's degree in Computer Science, Software Engineering, or a related field

o Minimum of 3 years of experience in software quality assurance or testing

o Strong knowledge of software testing methodologies, tools, and best practices

o Proficiency in at least one programming language (e.g., Java, Python, C#, Typescript)

o Experience with test automation frameworks and tools (e.g., Selenium, JUnit, TestNG)

o Familiarity with Agile development methodologies o Excellent problem-solving and analytical skills

o Strong communication and interpersonal abilities

o Good English

• Preferred:

o ISTQB Certified Tester or other relevant QA certifications

o Experience with continuous integration and version control systems

o Knowledge of performance testing and security testing techniques

o Familiarity with API testing and database testing

What We Offer

• Salary up to $1,500

• Build World class product(s): We love to solve complex problems and learn new things.

• Collaborating directly on projects alongside international partners provides valuable opportunities to engage and enhance skills through interactions with esteemed professionals in the region.

How to Apply

Send your CV to with the subject line: QA Software Engineer – (Your Full Name)

About Us

At SkyArcSol, we are at the forefront of the Web3 gaming revolution We are building the next generation of immersive, decentralized games where players have true ownership of their assets. Our mission is to merge compelling gameplay with the power of blockchain technology to create experiences that are not just fun, but also rewarding.

We are looking for a highly skilled and passionate Senior Full-Stack Blockchain Developer or a dedicated development team to be a cornerstone of our technical crew. If you dream in Solidity and Rust and are excited about building the future of digital entertainment, we want to hear from you

What You'll Be Building (Responsibilities)

As a key member of our team, you will be instrumental in bringing our game to life by architecting and implementing its core blockchain infrastructure. You will:

• Design & Develop Smart Contracts:
  Architect, write, test, and deploy secure and optimized smart contracts on both Ethereum (and L2s) and Solana for NFTs (in-game assets), tokenomics, staking, and core game logic.
• Build Backend Services:
  Develop robust backend APIs and services (e.g., using , Go, or Rust) that bridge our game client with our on-chain programs.
• Integrate Web3 Functionality:
  Collaborate with our game development team (Unity/Unreal) to seamlessly integrate features like wallet connections, transaction signing, and on-chain data display into the game client.
• Architect Scalable Systems:
  Design and implement both on-chain and off-chain architecture to ensure our game is scalable, secure, and performant for thousands of users.
• Ensure Top-Tier Security:
  Uphold the highest security standards. Implement rigorous testing, work with external auditors, and stay ahead of potential vulnerabilities.
• Collaborate & Innovate:
  Work closely with a cross-functional team of game designers, artists, and product managers to translate creative vision into technical reality.

What We're Looking For (Qualifications)

• Proven Blockchain Experience:
  Demonstrable experience in developing, deploying, and maintaining dApps and smart contracts on production mainnets.
• Dual-Chain Proficiency:
• Ethereum:
  Deep understanding of the EVM, expert-level proficiency in
  Solidity
  , and hands-on experience with tools like Hardhat/Foundry, and OpenZeppelin standards (ERC-721, ERC-1155, ERC-20).
• Solana:
  Hands-on experience building on-chain programs using
  Rust
  and the
  Anchor
  framework. Strong knowledge of the Solana architecture, SPL tokens, and the Metaplex standard.
• Full-Stack Expertise:
  Strong experience in backend development , Go, Python, or Rust) and creating APIs (REST, GraphQL).
• Web3 Integration Skills:
  Familiarity with frontend Web3 libraries such as , , and
• Security Mindset:
  A deep-seated commitment to security, with experience in smart contract auditing and testing methodologies.
• Collaborative Spirit:
  Excellent communication skills and the ability to work effectively within a dynamic, cross-functional team.
• Passion for Gaming:
  A genuine interest in video games and the potential of Web3 technology to revolutionize the industry.

Bonus Points

• Experience with Layer 2 scaling solutions (e.g., Polygon, Arbitrum, Optimism).
• Experience with game engines like Unity or Unreal Engine.
• Knowledge of tokenomics design and implementation.
• Contributions to open-source Web3 projects (please share your GitHub).
• Experience in a fast-paced startup environment.

Open to Teams & Agencies

We are also open to collaborating with established blockchain development teams or agencies who have a proven track record in the Web3 gaming space. If you are a team lead, please provide a portfolio of your team's relevant projects.

Why Join Us?

• Shape the Future:
  Be a core part of a project that is pushing the boundaries of gaming and blockchain.
• Full Ownership:
  Take charge of significant parts of our technical stack and see your work have a direct impact.
• Remote-First Culture:
  We value talent over location. Work from wherever you are most productive.
• Competitive Compensation:
  We offer a competitive salary and a generous token/equity package.
• Growth & Learning:
  Opportunity to work with cutting-edge technology in a rapidly evolving industry.

Ready to build with us? Apply now and let's create the next legendary crypto game together

Company Description

CDEX is a leading company specializing in AI Automation, driving innovation and efficiency in various industries. With a mission to harness the power of artificial intelligence, we create cutting-edge solutions that automate tasks, optimize workflows, and deliver actionable insights to our clients. Founded on excellence and innovation, CDEX is dedicated to providing top-tier AI solutions that exceed clients' expectations.

About the Role

About the Role We are looking for a
Frontend Engineer
with proven experience in developing and
optimizing candlestick charts and market pages for trading platforms
. Candidates with backgrounds in
Web3/DEX/CEX or traditional trading systems (stocks, forex)
are strongly encouraged to apply. The role focuses on frontend performance optimization,
real-time data visualization
, and user experience enhancement to deliver a fast, smooth, and interactive trading interface.

DETAILED RESPONSIBILITIES:

• Analyze and
  optimize candlestick charts and market pages
  (data loading speed, rendering efficiency, real-time updates).
• Integrate blockchain data sources (
  Web3 APIs, on-chain subscriptions
  ) to ensure real-time price and market fluctuation updates.
• Enhance chart interactivity
  (zooming, technical indicators like MA/RSI, theme switching, multi-device support).
• Diagnose and resolve bottlenecks (memory leaks, rendering delays, high concurrency).
• Collaborate with backend teams to optimize data transmission & caching (WebSocket, GraphQL).
• Participate in code reviews, testing, and deployment to maintain code quality and security.
• Explore cutting-edge technologies (WebGL, Canvas optimization, Wasm) to further improve chart rendering performance.

Qualifications

• At least 3+ years of experience in
  Frontend
  Development with
  JavaScript/TypeScript
  and frameworks like
  React or
• Hands-on experience with candlestick
  chart libraries (TradingView, Lightweight-charts, Highcharts…) and data visualization.
• Background in
  DEX, CEX, or traditional trading platforms
  is a big plus.
• Familiarity with blockchain technologies
  , , DeFi protocols, real-time data streaming).
• Strong skills in
  performance optimization
  (Chrome DevTools, Lighthouse, code splitting, lazy loading).
• Problem-solving mindset with strong collaboration skills.
• Bachelor's degree in Computer Science or related field (preferred).
• Open-source contributions, proven trading system optimization cases, or experience with Rust/Wasm.

BENEFITS

• Competitive salary and performance bonuses.
• Professional development opportunities.
• Collaborative and innovative work environment
• Top-tier

MÔ TẢ CÔNG VIỆC

• Phát triển và tối ưu giao thức Blockchain cho việc đồng thuận, xác thực khối và xử lý giao dịch.
• Phát triển phần mềm node, hệ thống lưu trữ dữ liệu và công cụ cho LTV.
• Thiết kế kiến trúc hạ tầng Blockchain có khả năng mở rộng, xử lý khối lượng giao dịch lớn.
• Thực hiện kiểm thử tự động, review code, kiểm toán bảo mật và giám sát rủi ro mạng lưới.
• Xây dựng API, tài liệu kỹ thuật và hỗ trợ tích hợp giao thức cho developer.

YÊU CẦU

• Tốt nghiệp CNTT/Khoa học máy tính hoặc ngành liên quan, có tư duy phân tích tốt.
• Có 02 năm kinh nghiệm phát triển blockchain, có kiến thức sâu về L1 (Ethereum, Bitcoin, Solana,.)
• Có 05 kinh nghiệm lập trình hệ thống Rust, Go, C++  hoặc ngôn ngữ lập trình khác.
• Hiểu biết về CI/CD, DevOps và quy trình kiểm thử phần mềm.
• Am hiểu thuật toán đồng thuận (PoW, PoS, BFT), hệ thống phân tán, mật mã học và mạng peer-to-peer.

QUYỀN LỢI

• Thu nhập theo năng lực cá nhân + Thưởng hiệu quả công việc (Token).
• Phụ cấp cơm trưa 45.000đ/ngày.
• Được hỗ trợ nền tảng, tài nguyên nội dung và chiến lược từ ETF Academy.
• Cơ hội kết nối sâu với cộng đồng nhà giao dịch và những người đi đầu công nghệ.
• Được thưởng các ngày Lễ, Tết, Sinh nhật và chế độ đãi ngộ khác từ Công ty.

THÔNG TIN LIÊN HỆ:

• Email:
• Zalo/phone: Mr. Tú)
• Địa chỉ làm việc: Tòa nhà TINI Coworking, 152 Võ Văn Kiệt, Phường Bến Thành, Hồ Chí Minh.

Responsibilities

• Implement a secure crypto payment system that allows users to pay rent or make deposits using cryptocurrencies.
• Use smart contracts to automate payment processes, ensuring transparency and reducing the risk of disputes.
• Enable support for multiple cryptocurrencies, providing users with flexibility in payment options.
• Optimize gas fees, transaction speeds, and contract security.
• Collaborate with backend and frontend teams for seamless integration.

Requirements

• 4+ years of blockchain development experience.
• Strong in Solidity, Ethereum, Polygon, and BSC.
• Knowledge of Rust or Golang is a plus.
• • Deep understanding of blockchain security best practices.
• Good English communication skill

Benefits

Salary: Upto 55M Gross+ Performance based award.

Flexible working regime and health care:

• Flexible timekeeping (from 8:00 - 9:00 to 17:30 - 18:30)
• Minimum 12 paid leaves per annum for all employees after probation
• 3-6 working days leave 30 minutes early

Transparent and fair benefits:

• Saturday & Sunday OFF, Overtime pay is 150%, 200%, 300% as per labor law;
• Work performance review 2 times/ year (in July and December) 13th-month salary

Bonus Policy:

• Public holidays (2/9, 30/4, 1/5, 1/1,.); Personal Performances; Excellent Team; Performance bonus in month salary;.
• Men's Day, Women's Day, Children's Day, Mid-Autumn Festival and other benefits under the provisions

Dynamic environment and open culture:

• Year-end party, sports day, yearly company trip and quarterly team building,.
• Socialize with colleagues through monthly Happy Hour

Monthly allowance when joining clubs:

• Soccer, Badminton, Pickleball,.
• Nice & modern working space with young, dynamic & friendly colleagues and free coffee, tea, drinks,.

Strong learning culture:

• Free training courses for technical and soft skills (presentation skills, communication skills, foreign language courses,.)
• Account to log in to our online learning system, which contains thousands of valuable lectures (LMS)
• Participate in workshops, seminars, tech talk,. with sharing from experts inside and outside the company
• Working opportunities with technical gurus who built and operated world-class applications with millions of usersContinuous development of hard and soft skills through work and professional training

Token Metrics is seeking a multi-talented Smart Contract Engineer to facilitate the operations of our Engineering team. As a Smart Contract Engineer, you will closely collaborate with fellow engineers and product managers to build infrastructure to bring Token Metrics privacy and scalability infrastructure to the Ethereum ecosystem. Examples of work include building a cross-chain bridge for moving assets, and implementing a Solidity smart contract to validate blocks for a private and auditable transaction system on Token Metrics.

• Design, implement, test, and deploy EVM smart contracts
• Work with external auditors to evaluate security and safety of smart contracts
• Take engineering projects from concept and design to production, while working with engineering leaders and the product team to create sound and realistic roadmaps.

• 3+ years of professional software engineering experience or equivalent blockchain/smart contract development experience
• Proficiency developing in Solidity; familiarity with precompiles
• Understanding of software engineering and security best practices, in particular smart contract security
• Experience interacting with dapps/web3
• Experience shipping and taking engineering projects to production.

About Token Metrics

Token Metrics helps crypto investors build profitable portfolios using artificial intelligence-based crypto indices, rankings, and price predictions.

Token Metrics has a diverse set of customers, from retail investors and traders to crypto fund managers, in more than 50 countries.

Layer 1 Blockchain Developer

Role Overview

We are seeking a skilled Layer 1 Blockchain Developer to build and optimize foundational blockchain infrastructure. You will work on core protocol components including consensus mechanisms, networking protocols, and transaction processing. The ideal candidate has deep understanding of distributed systems and hands-on experience developing Layer 1 blockchain protocols.

Key Responsibilities

Core Protocol Development

• Design and implement blockchain protocol features including consensus algorithms, block validation, and transaction processing
• Develop networking protocols for peer-to-peer communication and block propagation
• Build and maintain blockchain node software, storage, and indexing systems
• Implement cryptographic primitives and optimize blockchain performance for high throughput

System Architecture & Security

• Design scalable architecture for high transaction volume blockchain infrastructure
• Implement database systems for blockchain state management and historical data storage
• Develop comprehensive testing frameworks and security measures at the protocol level
• Perform code reviews, security audits, and monitor network vulnerabilities
• Create APIs, developer tools, and documentation for protocol integration

Required Qualifications

Technical Expertise

• 5+ years
  of systems programming experience in Rust, Go, C++, or similar low-level languages
• 3+ years
  of blockchain development experience with deep understanding of blockchain fundamentals
• Proven experience
  contributing to Layer 1 blockchain protocols (Ethereum, Bitcoin, Solana, Cosmos, etc.)
• Expert knowledge
  of consensus algorithms (PoW, PoS, BFT) and distributed systems
• Strong background
  in networking protocols, cryptographic principles, and peer-to-peer systems

Blockchain & Development Skills

• Comprehensive understanding of blockchain architecture, transactions, and state management
• Experience with virtual machines, execution environments (EVM, WASM), and different blockchain models
• Proficiency in database optimization, network programming, and performance testing
• Experience with testing frameworks, continuous integration, and DevOps practices
• Bachelor's degree in Computer Science or related field with strong analytical skills
• Fluent in Vietnamese and English. Chinese is a Plus