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CRYPTODATA Apex Company is seeking a specialist to execute and monitor pre-prepared trading signals as part of a spot arbitrage strategy in the cryptocurrency market.
Responsibilities
- Prompt execution of pre-defined trades (spot arbitrage)
- Verifying the accuracy of entry and exit points for positions
- Monitoring order execution across multiple exchanges (CEX/DEX)
- Tracking spreads, fees, and actual returns on trades
- Recording results and maintaining trading statistics
- Analyzing trade quality and identifying execution issues (slippage, delays, liquidity
- Collaborating with an analyst/strategist to improve trading signals
 
Requirements
- Understanding of how cryptocurrency exchanges and the spot market work
- No prior experience required
- High attention to detail and discipline in following instructions
- Ability to react quickly to market change
s- Basic understanding of arbitrage strategies
- Skills in analyzing trading results
 
We Offer
- Trading signals and strategies provided by the team
- Remote work and flexible schedule (within trading sessions)
 
Income:
$1,200–$2,000
Opportunity to advance to an analyst or strategist role upon successful performance
 
Telegram: @taodao89
apexcompany.naumova@gmail.com

Hello, I am Robert, business manager.
I am planning to expand my team's workplace to Brazil.
We have solid experience in software development.
But with some limited reasons, I am looking to collaborate with someone based in Brazil.
Before we start securing projects, we can provide a monthly payment to cover account activity (such as purchasing connects). I will personally take responsibility for managing the account and securing projects.
We believe this opportunity would be most suitable for someone who:
- Is based in Brazil
- Male, aged between 27–36
- Is looking for an additional source of income or a long-term business opportunity
- Willing to create some accounts for our team
- Is open to collaborating with an experienced software engineering team but no required any tech skills.
This would be the beginning of a longer-term collaboration. In the future, we are also planning to launch a startup, and we believe there could be opportunities for us to continue working together.
If interested, please contact me on telegram: SilverCraneKk
Thanks.

About DCS Card Centre
DCS Card Centre is a financial payments and Web3 company building at the intersection of AI agents and on-chain payments. We are hiring a Senior Smart Contract Engineer to design and implement the on-chain contracts and protocol integrations that enable autonomous payments by AI agents.
This is a deeply technical role focused on stablecoin settlement, on-chain authorization, agent identity, trusted machine-to-machine transactions, and secure payment infrastructure. You will write secure, gas-efficient, auditable Solidity code that may directly handle real value. Contract safety, code quality, and risk awareness are the highest priorities.
What You Will Work On
Design, develop, and test core payment smart contracts for stablecoin settlement, escrow/clearing, on-chain authorization, subscriptions, and usage-based billing.
Build reusable Solidity components and engineering standards for secure, gas-efficient, and audit-ready contracts.
Implement security best practices, including reentrancy protection, access control, integer safety, permission boundaries, upgrade risk review, and audit remediation.
Integrate emerging agentic payment protocols such as x402, AP2, ERC-8004, and related standards.
Build the on-chain identity, payment authorization, and stablecoin settlement loop for AI agents.
Contribute to multi-chain and L2 payment infrastructure, batch settlement, gas optimization, and stablecoin payment rails.
Work closely with backend, product, and risk teams to safely connect on-chain capabilities to production business flows.
Requirements
3–5 years of smart contract or blockchain engineering experience. Strong candidates with exceptional project experience are also welcome.
Strong Solidity expertise and hands-on experience shipping production smart contracts.
Deep understanding of the EVM, gas optimization, and common Solidity frameworks such as Foundry or Hardhat.
Strong smart contract security mindset and familiarity with common vulnerabilities and audit workflows.
Experience with at least one major EVM ecosystem such as Ethereum, Base, BNB Chain, or other L2 networks.
Experience in stablecoins, payments, DeFi, clearing/settlement, or other financial smart contract systems.
High ownership mindset and strong sensitivity to fund safety and production risk.
Nice To Have
Experience with agentic payment protocols such as x402, AP2, MPP, or ERC-8004.
Smart contract audit or formal verification experience with tools such as Slither, Echidna, Certora, or similar.
Experience with stablecoin payments, cross-chain settlement, or account abstraction such as ERC-4337.
Familiarity with AI Agent, MCP, A2A, or related agent technology stacks.
Rust or Move smart contract experience.
Financial services or payments industry background.
Location
Remote. Preferred working timezone overlap with Shanghai and Singapore. Outstanding candidates from other regions are welcome.
Compensation
Negotiable, depending on experience and fit.
How To Apply
Please send your CV, GitHub profile, and relevant smart contract, audit, DeFi, or payment project links to harris.han@dcsserv.com.
Company: DCS Card Centre Website: https://dcscc.com/

I am looking for a developer who has much experience in Mobile application development.
But specially, candidate should be native in English.
Team communication is very important.
Please bid US only
Thank you

The project is being developed around a Web3 trading infrastructure platform. As part of our long-term vision, the UK team at Iress is building a scalable, secure, and production-ready platform for trading, staking, and DeFi functionality. To support this effort, we are looking for experienced blockchain developers who can contribute to smart contract development, architecture, security, and overall platform implementation. We are currently in the team-building phase and identifying developers whose experience aligns with the technical requirements of the project. Selected candidates will be invited to discuss the project roadmap, responsibilities, and collaboration model with the UK technical leadership team.