Principal Software Engineer - Backend

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

About UseBlocky
At UseBlocky, we are a team of creatives and technologists constantly exploring innovative ideas and building impactful digital products. As a full-service creative agency specializing in Blockchain, Web3 Development, Design, Web & Mobile Development, and Marketing, we help businesses launch, scale, and succeed in the evolving digital landscape.
Position Overview
We are looking for a Senior Product Manager to lead the strategy, planning, and execution of blockchain and Web3 products. You will work closely with clients, designers, blockchain engineers, and stakeholders to define product vision, manage project delivery, and ensure successful outcomes for decentralized applications, smart contract platforms, token ecosystems, and other blockchain initiatives. 
Responsibilities
Own the product strategy, roadmap, and delivery of blockchain and Web3 projects.
Gather business requirements and translate them into product specifications and user stories.
Work closely with blockchain engineers to define smart contract, tokenomics, and dApp requirements.
Lead product discovery workshops with clients and stakeholders.
Prioritize features, manage backlogs, and coordinate sprint planning.
Ensure products align with market trends, user needs, and business goals.
Monitor project timelines, risks, and deliverables.
Analyze blockchain industry trends and identify new opportunities for clients.
Define and track product KPIs and success metrics.
Drive successful launches and continuous product improvement.
Required Qualifications
5+ years of Product Management experience in software, SaaS, fintech, blockchain, or Web3 industries.
Proven track record of leading and delivering blockchain, Web3, DeFi, NFT, tokenization, or dApp projects.
Strong understanding of blockchain technology, smart contracts, token standards, and decentralized applications.
Experience managing product roadmaps, backlogs, sprint planning, and cross-functional teams.
Ability to translate business requirements into detailed product specifications and user stories.
Experience working directly with engineering, design, and business stakeholders.
Strong analytical, problem-solving, and decision-making skills.
Excellent communication and stakeholder management abilities.
Familiarity with Agile and Scrum methodologies.
Experience using project and product management tools such as Jira, Notion, Confluence, or Productboard.
Preferred Qualifications
Experience with Blockchain, Web3, DeFi, NFT, or tokenized ecosystems.
Technical understanding of software development processes.
Familiarity with user research and UX principles.
What We Offer
Competitive Compensation — Attractive salary package with performance-based incentives.
Remote-First Flexibility — Work from anywhere with flexible hours and a focus on outcomes rather than schedules.
Professional Growth — Annual learning budget for certifications, courses, conferences, and blockchain-related training.
Modern Equipment & Home Office Support — Company-provided hardware and support for an efficient remote workspace.
Generous Paid Time Off — Flexible vacation policy that encourages work-life balance.
Pay Transparency Notice: 
Base salary varies by location (see range below). Total compensation may also include equity and bonus eligibility, and benefits (medical, dental, vision, 401(k)). 
Exceptional candidates may be considered above the stated range. Additional performance-based incentives may be available.
 Annual base salary range (excluding equity and bonus):
$220,000 - $280,000 USD

About UseBlocky
At UseBlocky, we combine creativity, technology, and innovation to build exceptional digital experiences. Our multidisciplinary teams deliver blockchain, Web3, mobile, web, and growth solutions for ambitious businesses worldwide.
Position Overview
We are looking for a Senior Engineering Manager to lead the successful delivery of blockchain and Web3 development projects while managing and mentoring engineering teams. You will oversee technical execution, resource planning, engineering quality, and project delivery across smart contract, backend, frontend, and infrastructure initiatives. 
Responsibilities
Lead engineering teams delivering blockchain and Web3 projects.
Collaborate with Product Managers and clients to define technical solutions and project scope.
Oversee architecture decisions for smart contracts, dApps, and supporting infrastructure.
Ensure projects are delivered on time, within scope, and at high quality standards.
Establish engineering best practices, security standards, and code review processes.
Manage project resources, technical risks, and development roadmaps.
Mentor and develop engineers across blockchain, backend, and frontend disciplines.
Support hiring, onboarding, and performance management.
Drive continuous improvements in engineering processes and team productivity.
Promote smart contract security, scalability, and operational excellence.
Required Qualifications
7+ years of software engineering experience, including 3+ years in engineering leadership or people management roles.
Proven experience leading the development and delivery of blockchain and Web3 projects.
Strong understanding of blockchain architecture, smart contracts, decentralized applications (dApps), and Web3 technologies.
Experience managing engineering teams across frontend, backend, blockchain, and infrastructure disciplines.
Strong knowledge of software architecture, system design, scalability, and security best practices.
Experience overseeing project planning, resource allocation, risk management, and delivery timelines.
Familiarity with Solidity, Ethereum, EVM-compatible chains, and modern Web3 development frameworks.
Experience implementing Agile development processes and engineering best practices.
Strong leadership, communication, mentoring, and team-building skills.
Ability to manage multiple projects and stakeholders in a fast-paced environment.
Preferred Qualifications
Experience managing blockchain or Web3 engineering teams.
Hands-on experience with cloud platforms such as AWS, GCP, or Azure.
Background in consulting, agency, or startup environments.
Familiarity with DevOps, CI/CD, and infrastructure management.
Benefits & Perks 
Competitive Compensation — Attractive salary package with performance-based incentives.
Remote-First Flexibility — Work from anywhere with flexible hours and a focus on outcomes rather than schedules.
Professional Growth — Annual learning budget for certifications, courses, conferences, and blockchain-related training.
Modern Equipment & Home Office Support — Company-provided hardware and support for an efficient remote workspace.
Generous Paid Time Off — Flexible vacation policy that encourages work-life balance.
Pay Transparency Notice:
Base salary varies by location (see range below). Total compensation may also include equity and bonus eligibility, and benefits (medical, dental, vision, 401(k)). 
Exceptional candidates may be considered above the stated range. Additional performance-based incentives may be available.
 Annual base salary range (excluding equity and bonus):
$220,000 - $320,000 USD
 

Hi,
I need a custom ebay like site for bitcoins or using stock credit on it. I need it to let you pay the user verbally, like an agreement you agree on that's it. I need the site fixed so it can be upgraded in the future.
I need it to be fixed so you can upload something to the site and sell it.
All I ask is keep the buying and selling part verbal agreements only. Like sending the user stock credit virtually.
Bid on things on the website 
Sell things on the website
Buy things on the website
All I ask is keep the programming simple and the website in a simple form.
I need a website for the web browser and one for the phone web browsers.
If you can put in a custom user admin for it also, then that will be great.
Thank you,
Chris Clark (666 Encryption, CEO)
 

 
 
we’re looking for a senior blockchain engineer to build low-latency execution infrastructure around hyperevm and hyperliquid-related trading systems.
 
this is not a frontend or dapp role. the focus is on real-time execution systems, chain-native infrastructure, and market-aware backend engineering where latency, ordering, and state correctness directly impact execution outcomes.
 
you will work on systems that operate under noisy, adversarial, and highly dynamic conditions, including delayed or missing websocket events, rpc inconsistencies, transaction lifecycle complexity, state desynchronization, retries, and recovery logic.
 
core responsibilities include building and maintaining realtime blockchain data pipelines, websocket and rpc streaming systems, execution orchestration layers, liquidity-aware routing logic, transaction lifecycle management, and integration with orderbook and market data systems.
 
we are specifically looking for engineers who think in systems rather than features. meaning understanding how data flows through pipelines, how state evolves over time, how failures propagate, and how to design systems that recover automatically without manual intervention.
 
areas of work include:
 
- realtime blockchain data ingestion
- mempool-aware execution flows
- transaction lifecycle handling
- execution sequencing and routing
- websocket and rpc infrastructure
- state synchronization systems
- liquidity and orderbook integration
- performance and latency optimization
 
you should be comfortable working with distributed systems, asynchronous event processing, and latency-sensitive backend architectures.
 
strong experience in one or more of the following areas is highly relevant:
 
- exchange infrastructure
- trading systems
- execution engines
- blockchain indexers
- realtime event systems
- arbitrage systems
- rpc/node infrastructure
- defi backend systems
- low-latency backend engineering
 
preferred technical stack:
 
- typescript / node.js
- go
- rust
- python
- postgres
- clickhouse
- redis
- kafka or similar messaging systems
- docker
- linux environments
- evm rpc internals
- websocket infrastructure
 
ecosystem familiarity:
 
- ethereum, arbitrum, base, optimism, bsc
- hyperliquid / hyperevm
- foundry
- ethers.js / viem
- geth / erigon / nethermind
- dex and amm mechanics
- liquidity math, slippage, gas strategy, routing logic
 
this role is not suitable for:
 
- frontend-only developers
- nft or basic dapp experience only
- tutorial-level web3 developers
- candidates without production systems experience
 
we value engineers who have built real systems where correctness, latency, and reliability matter under load. we care less about buzzwords and more about concrete systems you have personally built and operated.
 
ideal candidates can clearly explain:
 
- system architecture decisions
- bottlenecks and tradeoffs
- failure modes and recovery strategies
- latency considerations in real systems
- production debugging experience
 
working style:
 
- remote
- async-first
- low bureaucracy
- high ownership
- engineering-driven team
- direct technical communication
 
we strongly prefer practical engineering depth over polished presentation. if you have built or worked on systems involving realtime data, trading infrastructure, blockchain execution, or latency-sensitive backend systems, please include details of those systems when applying.