Blockchain Security Expert - Anti Defect Track
USA
Full time
Remote
Compensation is not specified
Role
Security Engineer
Description
About the Company
Founded in 2018 by professors from Yale University and Columbia University, CertiK is at the forefront of blockchain security, leveraging top-notch AI technology to secure and monitor blockchain protocols and smart contracts. Their goal is to safeguard the cyber world and bring cutting-edge innovations to enterprise applications, ensuring security and correctness in mission-critical operations. CertiK has gained significant trust in the blockchain security sector and is experiencing rapid growth, with high-profile clients and investors on board.
About the Position
As a Security Engineer at CertiK, the main focus will be on contributing to the company's security-related services at the intersection of cybersecurity and blockchain technology. Responsibilities include participating in security reviews, audits of smart contracts and blockchains, penetration testing, and verification processes. The role also involves identifying and analyzing vulnerabilities in smart contracts, developing feature code analysis tools, and staying up-to-date with the latest technology trends to enhance CertiK's security offerings.
Responsibilities
- Conduct audits for blockchain smart contracts, detecting and addressing security vulnerabilities.
- Define attack models for blockchain security evaluations.
- Develop tools for feature code analysis based on extracted insights from exploited code.
- Stay informed on analysis tools and emerging technologies in the sector.
Requirements
- Hold a bachelor’s degree or higher in a science or engineering field, along with a minimum of 3 years of work experience.
- Proficiency in languages like Solidity, Go, Rust, C++, Python, or Node.js is required, as well as a strong grasp of common algorithms.
- Familiarity with fundamental information security concepts is essential.
- Ability to operate effectively in an English-language working environment with strong communication skills.
- Passion for blockchain technology and a willingness to continuously learn and adapt.
Bonus Points
- Experience with maintaining or developing production pipelines.
- Knowledge of static code analysis methods like Syntax Analysis, Semantic Analysis, and Taint Analysis.
- Exposure to popular blockchain platforms such as Ethereum, Hyperledger, and Cosmos.
- Previous experience with blockchain smart contracts, security audits, and associated best practices.
- Hands-on experience evaluating risks for blockchain projects or analyzing on-chain security events.
The expected annual salary range for this position is $90,000 - $150,000, with the final compensation depending on the candidate's skills and experience. CertiK offers a comprehensive benefits package, including medical, vision, and dental insurance, a 401(k) plan, life insurance, flexible paid time off, and more.
CertiK is an equal opportunity employer, committed to diversity and inclusion in the workplace. Candidates with criminal histories will also be considered based on local and federal regulations.
Skills Required
CertiK
Website
www.certik.comCompany size
Not specified
Location
United States
Description
Not specified
Mykhailo Liashenko
Smart Contract Engineer
Part time
Remote
Company Information
RWAHub is a Web3 platform focused on real-world asset (RWA) tokenization, bridging traditional assets such as real estate, luxury goods, and art with blockchain technology.
We are building a scalable decentralized ecosystem that enables asset owners, investors, and DeFi participants to interact in a unified, transparent marketplace powered by tokenized finance.
Our mission is to improve accessibility, liquidity, and transparency in global asset ownership using blockchain infrastructure.
For general inquiries, contact:
support@rwahubassets.com
Senior Blockchain Developer
Location: Remote (Global)
Type: Full-time / Part-time
About the Role
We are hiring a Senior Blockchain Developer to design and build smart contract systems across multiple client and internal projects.
You will work on a variety of blockchain applications - from DeFi protocols to tokenized asset systems and Web3 platforms - ensuring high standards in security, scalability, and architecture.
This is a senior-level, hands-on role with exposure to multiple products and industries.
What You’ll Do
Design, develop, and deploy smart contracts using Solidity
Implement token standards (ERC-20, ERC-721, ERC-1155) and custom logic
Build and maintain contract architectures across multiple projects
Ensure security, audit readiness, and upgradeability
Optimize gas usage and performance
Collaborate with backend and frontend teams for integrations
Participate in code reviews and technical decision-making
Contribute to documentation and internal best practices
What We’re Looking For
4+ years of experience in blockchain / smart contract development
Strong expertise in Solidity and EVM-based ecosystems
Experience with Ethereum and L2s (Polygon, Arbitrum, Optimism)
Strong understanding of smart contract security and vulnerabilities
Experience with Hardhat, Foundry, or similar frameworks
Strong software engineering fundamentals (testing, Git, CI/CD)
Ability to work across multiple projects and adapt quickly
Nice to Have
Experience with DeFi protocols, staking, or token economies
Experience working with auditors or security reviews
Familiarity with upgradeable contracts (proxy patterns)
Backend experience (Node.js / TypeScript)
Experience in client-facing or consulting environments
Tech Stack
Solidity · Ethereum · Polygon · Arbitrum
Hardhat / Foundry · Node.js · TypeScript
React · ethers.js · IPFS
Why Join
Work across a diverse portfolio of blockchain projects
Exposure to both client work and internal ventures
Opportunity to influence architecture and technical direction
Collaborative, globally distributed team
Fast-paced environment with continuous learning
What Success Looks Like
Secure, production-ready smart contracts delivered across projects
Successful audits with minimal critical issues
Scalable and reusable contract architectures
Strong collaboration with cross-functional teams
Consistent delivery across multiple initiatives
Hiring Process
Application review
Technical screening (take-home task)
Technical interview (Solidity & architecture)
Final discussion
How to Apply
Please submit:
Resume or LinkedIn
GitHub profile (required)
Examples of smart contracts or blockchain projects
📩 Applications & inquiries: support@rwahubassets.com
RWAHub is a Web3 platform focused on real-world asset (RWA) tokenization, bridging traditional assets such as real estate, luxury goods, and art with blockchain technology.
We are building a scalable decentralized ecosystem that enables asset owners, investors, and DeFi participants to interact in a unified, transparent marketplace powered by tokenized finance.
Our mission is to improve accessibility, liquidity, and transparency in global asset ownership using blockchain infrastructure.
For general inquiries, contact:
support@rwahubassets.com
Senior Blockchain Developer
Location: Remote (Global)
Type: Full-time / Part-time
About the Role
We are hiring a Senior Blockchain Developer to design and build smart contract systems across multiple client and internal projects.
You will work on a variety of blockchain applications - from DeFi protocols to tokenized asset systems and Web3 platforms - ensuring high standards in security, scalability, and architecture.
This is a senior-level, hands-on role with exposure to multiple products and industries.
What You’ll Do
Design, develop, and deploy smart contracts using Solidity
Implement token standards (ERC-20, ERC-721, ERC-1155) and custom logic
Build and maintain contract architectures across multiple projects
Ensure security, audit readiness, and upgradeability
Optimize gas usage and performance
Collaborate with backend and frontend teams for integrations
Participate in code reviews and technical decision-making
Contribute to documentation and internal best practices
What We’re Looking For
4+ years of experience in blockchain / smart contract development
Strong expertise in Solidity and EVM-based ecosystems
Experience with Ethereum and L2s (Polygon, Arbitrum, Optimism)
Strong understanding of smart contract security and vulnerabilities
Experience with Hardhat, Foundry, or similar frameworks
Strong software engineering fundamentals (testing, Git, CI/CD)
Ability to work across multiple projects and adapt quickly
Nice to Have
Experience with DeFi protocols, staking, or token economies
Experience working with auditors or security reviews
Familiarity with upgradeable contracts (proxy patterns)
Backend experience (Node.js / TypeScript)
Experience in client-facing or consulting environments
Tech Stack
Solidity · Ethereum · Polygon · Arbitrum
Hardhat / Foundry · Node.js · TypeScript
React · ethers.js · IPFS
Why Join
Work across a diverse portfolio of blockchain projects
Exposure to both client work and internal ventures
Opportunity to influence architecture and technical direction
Collaborative, globally distributed team
Fast-paced environment with continuous learning
What Success Looks Like
Secure, production-ready smart contracts delivered across projects
Successful audits with minimal critical issues
Scalable and reusable contract architectures
Strong collaboration with cross-functional teams
Consistent delivery across multiple initiatives
Hiring Process
Application review
Technical screening (take-home task)
Technical interview (Solidity & architecture)
Final discussion
How to Apply
Please submit:
Resume or LinkedIn
GitHub profile (required)
Examples of smart contracts or blockchain projects
📩 Applications & inquiries: support@rwahubassets.com
Payment in Crypto
NextBit Marketing LLC
Business development Manager
Full time
Remote
Hey everyone,
I’m looking for recommendations or to connect directly with a marketing team / agency that genuinely understands the Forex trading space — especially community-led growth.
I run many public XAUUSD signals Telegram channel that has grown organically to 12,000+ members over the years (since 2020). No ads, no clickbait, no fake screenshots. The channel is completely free and will stay that way because the core idea has always been transparency and live testing rather than selling promises.
A few things about the community:
• Signals focused only on FX & XAUUSD
• Consistent average accuracy around ~78%
• Clear risk management & lot sizing shared with every setup
• Priority is always capital protection, not overtrading
• Everything is public so anyone can track performance in real time for as long as they want
The growth so far has been word-of-mouth and organic, but now I want to scale this community responsibly and reach 100,000+ free members this year without turning it into a hype machine.
I’m not looking for generic social media marketers. I’m specifically interested in people/agencies who:
• Understand traders, not just traffic
• Can grow communities ethically and sustainably
• Know how to position transparency as a strength (not fake luxury marketing)
• Have experience with Telegram / Instagram / Reddit / Trading communities
If you’re a marketer in this niche, or you’ve worked with someone solid before, I’d really appreciate guidance, referrals, or a conversation.
Thanks in advance 🙏
Happy to share more details in DMs.
I’m looking for recommendations or to connect directly with a marketing team / agency that genuinely understands the Forex trading space — especially community-led growth.
I run many public XAUUSD signals Telegram channel that has grown organically to 12,000+ members over the years (since 2020). No ads, no clickbait, no fake screenshots. The channel is completely free and will stay that way because the core idea has always been transparency and live testing rather than selling promises.
A few things about the community:
• Signals focused only on FX & XAUUSD
• Consistent average accuracy around ~78%
• Clear risk management & lot sizing shared with every setup
• Priority is always capital protection, not overtrading
• Everything is public so anyone can track performance in real time for as long as they want
The growth so far has been word-of-mouth and organic, but now I want to scale this community responsibly and reach 100,000+ free members this year without turning it into a hype machine.
I’m not looking for generic social media marketers. I’m specifically interested in people/agencies who:
• Understand traders, not just traffic
• Can grow communities ethically and sustainably
• Know how to position transparency as a strength (not fake luxury marketing)
• Have experience with Telegram / Instagram / Reddit / Trading communities
If you’re a marketer in this niche, or you’ve worked with someone solid before, I’d really appreciate guidance, referrals, or a conversation.
Thanks in advance 🙏
Happy to share more details in DMs.
Payment in Crypto
Adam Miller
Web3 Game Developer (UE5 + Blockchain & Smart Contracts)
Full time
Remote
Rivwake is an ambitious early-stage Web3 metaverse project built on Unreal Engine 5.
We are creating Overworld — an immersive metaverse with a strong focus on User Generated Content (UGC). Players will be able to play, create worlds, games, and assets.
The first game is Strifest — a competitive team-based arena shooter with building mechanics.
The project combines high-quality UE5 gameplay with real blockchain economy: NFT rewards, staking, tokens, and creator economy.
Who We Are Looking For (Two Main Roles):
1. Web3 Game Developer (Primary Role)
Web3 integration into UE5 (wallet connect, NFT minting/claiming, staking)
Smart contract development (Solidity)
Backend flow between the game and blockchain
P2E mechanics and token economy
2. Web3 Game QA Tester / Blockchain Tester
Testing NFT rewards, staking, and claiming mechanics
Testing Web3 integrations (wallets, transactions, on-chain events)
Finding and reporting blockchain-related bugs
Regression testing after updates
Testing economy and anti-exploit systems
Requirements:
For Developer:
Strong experience with Solidity and Smart Contracts
Web3 integration (wallets, NFT, staking)
Unreal Engine 5 experience is a big plus
For Tester:
Experience in Game QA or Web3/P2E testing
Good knowledge of blockchain and NFT mechanics
Ability to write detailed bug reports
Basic understanding of UE5 is a plus
General Conditions (for both roles):
Long-term collaboration (starting from 2-3 months)
30–40 hours per week
Fully remote
Rate: $55 – 85 / hour (depending on role and experience)
We are at an early alpha stage. We provide test access to the project and documentation. There is a possibility of equity / token allocation for strong candidates who stay with the project long-term.
We are creating Overworld — an immersive metaverse with a strong focus on User Generated Content (UGC). Players will be able to play, create worlds, games, and assets.
The first game is Strifest — a competitive team-based arena shooter with building mechanics.
The project combines high-quality UE5 gameplay with real blockchain economy: NFT rewards, staking, tokens, and creator economy.
Who We Are Looking For (Two Main Roles):
1. Web3 Game Developer (Primary Role)
Web3 integration into UE5 (wallet connect, NFT minting/claiming, staking)
Smart contract development (Solidity)
Backend flow between the game and blockchain
P2E mechanics and token economy
2. Web3 Game QA Tester / Blockchain Tester
Testing NFT rewards, staking, and claiming mechanics
Testing Web3 integrations (wallets, transactions, on-chain events)
Finding and reporting blockchain-related bugs
Regression testing after updates
Testing economy and anti-exploit systems
Requirements:
For Developer:
Strong experience with Solidity and Smart Contracts
Web3 integration (wallets, NFT, staking)
Unreal Engine 5 experience is a big plus
For Tester:
Experience in Game QA or Web3/P2E testing
Good knowledge of blockchain and NFT mechanics
Ability to write detailed bug reports
Basic understanding of UE5 is a plus
General Conditions (for both roles):
Long-term collaboration (starting from 2-3 months)
30–40 hours per week
Fully remote
Rate: $55 – 85 / hour (depending on role and experience)
We are at an early alpha stage. We provide test access to the project and documentation. There is a possibility of equity / token allocation for strong candidates who stay with the project long-term.
TA Quant
Senior Rust Developer
Full time
Remote
About the Role
We're looking for a Senior Rust Developer to join our core engineering team and own the systems that sit closest to the market. This means low-latency order execution engines, high-throughput market data pipelines, real-time streaming infrastructure, and integrations with both centralized and decentralized exchanges. Every millisecond and every line of code matters here, and you'll be the person making sure it all holds up under pressure. This is not a role for someone who wants to write Rust adjacent to trading. You'll be building the backbone of live production systems where correctness, safety, and raw performance have direct P&L consequences. You'll work alongside quantitative researchers and other engineers to implement and deploy strategies, and you'll have meaningful input into the infrastructure decisions that shape how we build and scale. If you've spent years pushing Rust to its limits in high-performance environments and you want that work to matter in real markets in real time, this is the role.
Responsibilities
Design, build, and maintain high-throughput, low-latency trading systems in Rust
Develop and optimize order execution engines, market data feeds, and real-time processing pipelines
Build reliable integrations with centralized and decentralized exchanges across CEX and DEX environments
Architect systems for real-time streaming data and WebSocket communication at scale
Write safe, well-tested concurrent code leveraging async runtimes including Tokio and async-std
Collaborate with quantitative researchers to implement and deploy trading strategies into production
Profile, benchmark, and eliminate performance bottlenecks across critical system paths
Contribute to infrastructure decisions around deployment, observability, and fault tolerance
Requirements
5+ years of professional software engineering experience
2+ years building and maintaining production systems in Rust, and you will be tested on it
Deep command of Rust's ownership model, lifetimes, traits, and async patterns
Experience with high-performance networking including TCP/UDP, WebSockets, and gRPC
Strong understanding of concurrency primitives and lock-free data structures
Familiarity with financial systems, trading platforms, or real-time data pipelines
Linux systems programming and performance tuning experience
Comfortable working independently in a fast-paced, remote-first environment
Nice to Have
Experience with cryptocurrency exchanges, DeFi protocols, or blockchain RPC nodes
Knowledge of FIX protocol or other financial messaging standards
Open-source Rust contributions
Experience with FPGA or kernel-bypass networking such as DPDK or io_uring
Familiarity with quantitative trading concepts including order books and market microstructure
Infrastructure experience with Docker, Kubernetes, Terraform, or Prometheus/Grafana
We're looking for a Senior Rust Developer to join our core engineering team and own the systems that sit closest to the market. This means low-latency order execution engines, high-throughput market data pipelines, real-time streaming infrastructure, and integrations with both centralized and decentralized exchanges. Every millisecond and every line of code matters here, and you'll be the person making sure it all holds up under pressure. This is not a role for someone who wants to write Rust adjacent to trading. You'll be building the backbone of live production systems where correctness, safety, and raw performance have direct P&L consequences. You'll work alongside quantitative researchers and other engineers to implement and deploy strategies, and you'll have meaningful input into the infrastructure decisions that shape how we build and scale. If you've spent years pushing Rust to its limits in high-performance environments and you want that work to matter in real markets in real time, this is the role.
Responsibilities
Design, build, and maintain high-throughput, low-latency trading systems in Rust
Develop and optimize order execution engines, market data feeds, and real-time processing pipelines
Build reliable integrations with centralized and decentralized exchanges across CEX and DEX environments
Architect systems for real-time streaming data and WebSocket communication at scale
Write safe, well-tested concurrent code leveraging async runtimes including Tokio and async-std
Collaborate with quantitative researchers to implement and deploy trading strategies into production
Profile, benchmark, and eliminate performance bottlenecks across critical system paths
Contribute to infrastructure decisions around deployment, observability, and fault tolerance
Requirements
5+ years of professional software engineering experience
2+ years building and maintaining production systems in Rust, and you will be tested on it
Deep command of Rust's ownership model, lifetimes, traits, and async patterns
Experience with high-performance networking including TCP/UDP, WebSockets, and gRPC
Strong understanding of concurrency primitives and lock-free data structures
Familiarity with financial systems, trading platforms, or real-time data pipelines
Linux systems programming and performance tuning experience
Comfortable working independently in a fast-paced, remote-first environment
Nice to Have
Experience with cryptocurrency exchanges, DeFi protocols, or blockchain RPC nodes
Knowledge of FIX protocol or other financial messaging standards
Open-source Rust contributions
Experience with FPGA or kernel-bypass networking such as DPDK or io_uring
Familiarity with quantitative trading concepts including order books and market microstructure
Infrastructure experience with Docker, Kubernetes, Terraform, or Prometheus/Grafana
Payment in Crypto
DeGameVerse
UI/UX Designer
Part time
Remote
About DeGameVerse
DeGameVerse is building a next-generation Web3 gaming ecosystem where developers create games and players explore, play, and earn through a unified platform experience.
We are focused on:
Walletless onboarding
Mobile-first gaming experience
AI-assisted game creation
Clean and accessible Web3 UX
This is an early-stage startup currently building its core founding team.
Role Overview
We are looking for a creative UI/UX Designer who can help shape the visual identity and user experience of DeGameVerse.
You will work closely with the founder and development team to design a smooth, modern, and engaging platform experience for both players and developers.
This is a startup builder role with high creative ownership.
Responsibilities
Design user-friendly interfaces for web and mobile
Create UI flows for player dashboard, developer dashboard, and game hub
Build consistent design systems and reusable components
Improve user onboarding and overall UX experience
Design wireframes, mockups, and interactive prototypes
Collaborate closely with developers during implementation
Ensure responsive and modern UI standards
Requirements
Experience with Figma or similar design tools
Strong understanding of UI/UX principles
Ability to create clean, modern, and intuitive interfaces
Good communication and collaboration skills
Startup mindset and problem-solving ability
Bonus Skills
Experience designing gaming or Web3 products
Motion UI / animation knowledge
Basic frontend understanding (HTML/CSS/React concepts)
Experience with mobile-first design systems
What We Offer
Early core team opportunity
Equity-based contribution model
High creative freedom and ownership
Opportunity to help shape a new Web3 gaming ecosystem
Portfolio-level product design experience
⚠️ Important Note
This is an early-stage startup role.
No fixed salary initially. Compensation is equity-based until funding or revenue is secured.
DeGameVerse is building a next-generation Web3 gaming ecosystem where developers create games and players explore, play, and earn through a unified platform experience.
We are focused on:
Walletless onboarding
Mobile-first gaming experience
AI-assisted game creation
Clean and accessible Web3 UX
This is an early-stage startup currently building its core founding team.
Role Overview
We are looking for a creative UI/UX Designer who can help shape the visual identity and user experience of DeGameVerse.
You will work closely with the founder and development team to design a smooth, modern, and engaging platform experience for both players and developers.
This is a startup builder role with high creative ownership.
Responsibilities
Design user-friendly interfaces for web and mobile
Create UI flows for player dashboard, developer dashboard, and game hub
Build consistent design systems and reusable components
Improve user onboarding and overall UX experience
Design wireframes, mockups, and interactive prototypes
Collaborate closely with developers during implementation
Ensure responsive and modern UI standards
Requirements
Experience with Figma or similar design tools
Strong understanding of UI/UX principles
Ability to create clean, modern, and intuitive interfaces
Good communication and collaboration skills
Startup mindset and problem-solving ability
Bonus Skills
Experience designing gaming or Web3 products
Motion UI / animation knowledge
Basic frontend understanding (HTML/CSS/React concepts)
Experience with mobile-first design systems
What We Offer
Early core team opportunity
Equity-based contribution model
High creative freedom and ownership
Opportunity to help shape a new Web3 gaming ecosystem
Portfolio-level product design experience
⚠️ Important Note
This is an early-stage startup role.
No fixed salary initially. Compensation is equity-based until funding or revenue is secured.