Software Engineer - Backend

Smart Contract / Blockchain Engineer
Company: Averiq Labs
Location: San Francisco, CA
Industry: Blockchain / Web3 Infrastructure
Employment: Full-time
About Averiq Labs
Averiq Labs is a Web3 technology company building infrastructure and decentralized systems for the next generation of blockchain applications.
We work across smart contracts, DeFi, blockchain infrastructure, protocol engineering, and developer tooling. We're looking for engineers who enjoy working close to the protocol level and solving difficult technical problems.
About the Role
We're looking for a Smart Contract / Blockchain Engineer to join our engineering team.
You'll design, develop, test, and optimize smart contracts and blockchain systems. You'll work with technologies such as Solidity, EVM, Foundry, DeFi protocols, and Ethereum-compatible networks.
This role is particularly suited to engineers who want to go beyond simply writing Solidity and understand how blockchain systems actually work under the hood.
Responsibilities
Design and develop production-grade Solidity smart contracts
Build and test DeFi protocols and blockchain applications
Develop automated tests using Foundry
Analyze existing protocols and smart-contract architectures
Optimize contract execution and gas usage
Research blockchain protocols and emerging technologies
Identify and mitigate smart-contract security vulnerabilities
Work with backend and infrastructure engineers
Participate in code reviews and technical design discussions
Research MEV, transaction ordering, and protocol-level mechanisms when relevant
Requirements
Required:
Strong programming fundamentals
Experience with Solidity or another blockchain smart-contract language
Understanding of Ethereum/EVM architecture
Familiarity with Git and GitHub
Understanding of smart-contract security fundamentals
Ability to read and understand existing smart-contract code
Nice to have:
Foundry experience
Experience with Uniswap, Aave, Compound, or similar protocols
Rust, Go, or TypeScript experience
Knowledge of EVM internals
MEV/arbitrage experience
Blockchain node/RPC experience
Previous DeFi or protocol development experience
Technical Hiring Process
We don't rely exclusively on interviews.
Our hiring process is designed to evaluate actual engineering ability:
1. Application & CV Review
We review your technical background and previous projects.
2. Technical Screening
A short technical discussion covering your experience and understanding of blockchain fundamentals.
3. Engineering Project
Qualified candidates receive a practical blockchain engineering assignment.
For example, candidates may be asked to build and test a small DeFi/treasury protocol, analyze an existing smart contract, or implement a blockchain-related component.
The project evaluates:
Code quality
Architecture
Solidity knowledge
Testing
Security
Problem-solving
Documentation
4. Technical Review
An engineer reviews the submitted project and discusses the implementation with you.
5. Final Interview
Discussion with the engineering team about your technical experience, interests, and potential role at Averiq Labs.
What We Value
We care more about what you can build than how many years you've worked.
We're particularly interested in engineers who:
Build projects outside of work
Read open-source protocol code
Understand why systems work, not just how to use them
Can independently investigate unfamiliar technologies
Care about security and correctness
Enjoy difficult technical problems
Compensation
Competitive compensation based on experience and technical ability, with additional consideration for exceptional blockchain engineering experience.

We are looking for a talented iOS Developer to join our team on a full-time remote basis. The ideal candidate should have experience developing and maintaining iOS applications using Swift and Xcode. You will work closely with our design and backend teams to build high-quality, user-friendly mobile applications.Responsibilities:Develop and maintain iOS applications.Write clean, efficient, and maintainable code.Collaborate with designers and backend developers.Fix bugs and improve app performance.Participate in code reviews and testing.Requirements:Experience with Swift and Xcode.Knowledge of UIKit and/or SwiftUI.Familiarity with REST APIs and Git.Strong problem-solving and communication skills.Ability to work independently in a remote environment.Benefits:Competitive salary (paid in cryptocurrency).Flexible remote work.Opportunity to work on exciting projects.Friendly and supportive team.

I am Sadr, CEO of Oferli. We are building a high-performance, elite technical team, and I am looking for 5 to 10 dedicated founding technical partners to join me in this mission.
​The Vision:
Oferli is a 100% decentralized ecosystem. While we are rooted in Web3, our expertise spans across professional web and mobile application development. We are not just another agency; we are crafting the next generation of digital solutions. Our goal is to set a new standard for excellence, transparency, and decentralization.
​What I am looking for:
I am building a professional, senior-level "Elite Team." I am looking for partners who are truly passionate about the vision—not just short-term gains. By combining our individual expertise and portfolios, we will establish Oferli’s collective professional reputation.
​Requirements:
​Proven Expertise: You must be a senior-level professional. Please provide your portfolio showcasing your best work in web and mobile development.
​Commitment: This is a founding partnership. We are looking for those who believe in the mission and are ready to tackle complex challenges together.
​Professionalism: We operate with high standards. Communication and efficiency are key.
​How We Work:
​Collaboration: We use professional, secure channels for all communications. Qualified candidates will be contacted via email to be invited to our private workspace on Notion to align on our roadmap and launch our upcoming projects.
​Decentralized Operations: We leverage Web3 tools for collaboration and compensation, maintaining a fully decentralized environment.
​Growth: We are launching with a core team of at least 5 founding partners, scaling to 10, to deliver high-impact results for our clients.
​Application Process:
If you are a senior professional ready to build a world-class, decentralized ecosystem, apply here on LaborX. Qualified candidates will be contacted via email for further professional vetting and onboarding.
​Let’s build the future, together.
​Sadr B
CEO, Oferli

About the Role
We are building a next-generation Web3 social platform designed to redefine how digital communities connect, collaborate, and grow.
Backed by years of experience within the cryptocurrency, blockchain, and digital asset ecosystem, our team has developed deep insights into how founders, developers, investors, creators, and communities interact. This understanding inspired us to create a platform that goes beyond financial applications and focuses on empowering meaningful social engagement.
Our mission is to build a transparent, community-driven social network where users can share ideas, collaborate on projects, discover opportunities, and create lasting relationships. We believe the next evolution of social media will be powered by decentralized technologies while maintaining an exceptional user experience, simplicity, and long-term sustainability.
We are seeking an experienced Chief Technology Officer (CTO) or Senior Full-Stack Developer who is passionate about Web3 and capable of leading the technical vision, architecture, and execution of our platform from the ground up.
Responsibilities
Lead the technical strategy and product architecture.
Design and build scalable backend systems and modern frontend applications.
Develop high-performance APIs and real-time features.
Integrate blockchain technologies, wallets, and Web3 authentication where appropriate.
Build secure, reliable, and maintainable infrastructure.
Collaborate closely with product, design, and leadership teams.
Establish engineering best practices, code quality standards, and development workflows.
Mentor engineers and help grow the technical organization.
Evaluate emerging technologies and implement solutions that improve scalability, security, and user experience.
Requirements
5+ years of professional software development experience.
Strong experience with modern JavaScript/TypeScript ecosystems.
Experience with React, Next.js, Node.js, or similar technologies.
Solid understanding of system architecture, cloud infrastructure, databases, and API design.
Experience building scalable consumer-facing products.
Familiarity with blockchain technologies, Web3 infrastructure, wallets, smart contracts, or decentralized applications.
Strong knowledge of security best practices and application performance optimization.
Excellent problem-solving and communication skills.
Ability to work independently in a fast-paced startup environment.
Preferred Qualifications
Experience building Web3 or crypto products.
Understanding of decentralized identity, token ecosystems, or on-chain social applications.
Experience leading engineering teams or serving in a technical leadership role.
Background in DevOps, CI/CD, Docker, Kubernetes, or cloud platforms such as AWS or GCP.
Experience with real-time messaging, social platforms, or community products.
What We Offer
Competitive full-time compensation.
Opportunity to build a product from an early stage with significant technical ownership.
Flexible and remote-friendly work environment.
Collaborative team focused on innovation and long-term impact.
Work on cutting-edge Web3 technologies and help shape the future of digital communities.
Opportunity for career growth and leadership as the platform scales.
If you are excited about building the next generation of Web3 social experiences and want to make a meaningful impact from the earliest stages, we'd love to hear from you.

We are building a modern hotel booking platform enhanced with Web3 capabilities, includingtoken-based payments, on-chain verification, and decentralized identity/ownership features.We’re looking for a Backend Engineer to design and build scalable backend systems andintegrate them with blockchain infrastructure. You’ll work closely with frontend and Web3engineers to deliver a seamless and reliable platform.