Develop backend services in Go for blockchain interactions, implementing ERC-4337 account abstraction, smart contracts, and microservices.
Build frontend applications with React/Next.js, integrating embedded wallet SDKs, Web3 libraries, and real-time blockchain events.
Design and implement full-stack Web3 features from smart contract events to UI, including ZK Stack specifics, admin panels, and transaction tracking.
Xsolla is a global commerce company that provides tools and services to help video game developers fund, distribute, market, and monetize their games. With over 1,500 game developers served and a remote-first culture, Xsolla prioritizes employee well-being, creativity, and collaboration.
Develop backend services in Go for blockchain infrastructure, including NFT marketplaces, smart wallets, and gaming systems.
Integrate with ZK Stack, Ethereum, and account abstraction protocols to build scalable Web3 services.
Design resilient microservices, APIs, and event scanners while ensuring high availability and performance.
Xsolla is a global commerce company that provides tools and services to help video game developers fund, distribute, market, and monetize their games. The company has helped over 1,500 game developers and fosters a supportive culture focused on employee well-being and professional growth.
Design and build core services for Transit's RFQ orchestration engine and crosschain exchange orderbook.
Own systems end to end from design through deployment, monitoring, and the on-call reality of moving real money.
Integrate new chains, venues, solver networks, and liquidity sources while setting technical direction on a small team.
Paxos Labs builds enterprise infrastructure for trusted onchain financial products, enabling major platforms to bring digital assets and DeFi into mainstream use. We're a small team of roughly 15 people, where engineers own whole systems, ship quickly, and work on hard problems with a finance-grade correctness bar.
Develop core backend infrastructure for blockchain execution and Ethereum scaling.
Tackle distributed systems challenges involving reliability, performance, and scalability.
Strengthen security and drive projects from investigation through implementation.
They build foundational infrastructure for Ethereum scalability, security, and decentralized applications. They are a remote-first, globally distributed team collaborating across research, product, and blockchain engineering.
Own features end to end: backend, frontend, and production.
Build backend services in Go and TypeScript, dApp frontends in React, and integrate smart wallets.
Review code, monitor production, and maintain AI tooling for the team.
Xsolla is a global video game commerce company headquartered in Los Angeles. It helps developers from indie to AAA fund, distribute, market and monetize their games, and acts as merchant of record for 1,500+ developers worldwide.
Contribute as a freelance specialist to blockchain infrastructure and protocol projects aligned with your expertise.
Design, develop, test, and maintain production-grade blockchain systems and distributed networks.
Solve complex challenges in security, privacy, scalability, cryptography, and consensus protocols.
Jobgether is a talent network connecting experienced blockchain engineers with high-impact infrastructure projects across the decentralized web. It fosters a remote-first, self-directed culture with support from engineering leads and a vetted community of specialists.
Design and operate backend systems collecting data on 400M+ creator profiles across major social platforms.
Build resilient infrastructure handling high-volume data, third-party APIs, and proxy networks at scale.
Own systems end-to-end, from architecture and deployment to monitoring and continuous improvement.
They build a large-scale creator data platform tracking 400M+ profiles across major social media. The culture is remote-first, async-oriented, and collaborative with substantial autonomy for senior engineers.
Build and maintain backend services and REST APIs using TypeScript and Node.js.
Design PostgreSQL schemas, write migrations, and implement features like authentication and billing.
Write automated tests, diagnose issues, and contribute to code reviews to ensure reliability.
Aleroy is building a unified platform for high-performance AI inference, making it easier for companies to deploy and run AI models at scale. We work in small teams, collaborate directly, and focus on solving complex engineering challenges to build reliable, scalable AI infrastructure.
Own product strategy and roadmaps for Hardhat and EDR, aligning with developer needs and ecosystem priorities.
Translate technical challenges into clear requirements, prioritizing features for smart contract development workflows.
Collaborate with engineering and ecosystem partners to shape APIs, CLIs, and developer experience.
They advance the Ethereum ecosystem by building open-source developer tools like Hardhat and EDR. They operate fully remote-first with a lean, collaborative culture focused on autonomy and practical decision-making.
Lead technical design and delivery of scalable banking features for a seamless mobile experience.
Set architectural standards for code quality, performance, security, and reliability across services.
Mentor engineers and partner with product, design, risk, and compliance to ship high-quality software.
OnePay is an all-in-one consumer fintech platform offering banking, savings, credit, lending, investing, and crypto. It's a fast-moving, mission-driven company backed by Walmart and Ribbit Capital, with a low-ego, inclusive culture.
Design, develop, and maintain the central API and backend services using Node.js and TypeScript.
Build fast, reliable services and design intuitive APIs and data models for excellent developer experience.
Take end-to-end ownership of projects, scaling existing products and validating new ideas through MVPs.
The company builds technology that helps hundreds of thousands of users understand and manage their finances. It is a small, ambitious product team with a remote-first, flexible, and asynchronous culture.
Design, develop, and maintain scalable backend services and APIs for the Contacts domain.
Optimize system performance, reliability, and observability in a high-scale environment.
Collaborate cross-functionally with product, design, and engineering teams to deliver high-quality features.
HighLevel is an AI-powered business operating system that gives agencies, entrepreneurs and SMBs the infrastructure to build, automate and scale. With over 2,000 team members across 10+ countries, HighLevel operates as a global, remote-first organization built for speed and ownership.
Own the money side of Splash: deposits, withdrawals, entry fees, payouts, fraud checks, and the double-entry ledger tying every cent back to player wallets and contests.
Design and run backend services on NodeJS and TypeScript in AWS, working closely with Finance, Compliance, and engineers in the US and Prague.
Automate reconciliation, build payment processor integrations, and ensure exactly-once posting, audit trails, and safe concurrency in a regulated real-money environment.
Splash brings people and communities together through the gamification of live sports and events. We're a small, quickly growing, remote-first team that loves sports and tech startups.
Own features end-to-end from problem space to technical modeling and UX execution.
Build complex backend systems and intuitive frontend interfaces to fight fraud.
Collaborate with Design, Data, Product, and Account Management teams.
Sardine is the leading agentic risk platform for fighting financial crime, helping organizations stop fraud and automate AML operations. Remote-first and values performance over hours, hiring self-motivated individuals with extreme ownership.
Build full stack features end to end, from design through deployment and production support, with a focus on reliability and scalability.
Partner with Product and Design to shape scope, surface technical trade-offs, and provide credible estimates.
Raise the engineering bar through code reviews, mentoring, and shared standards while participating in on-call rotation.
Topstep builds the products funded traders and internal teams use every day, including trader-facing web experiences, account flows, payments, and internal tooling. The company fosters a collaborative, camera-on culture with a mix of fully remote and hybrid work, and encourages taking time off.
Build and maintain a TypeScript monorepo including a Next.js web app, Expo mobile app, and Cloudflare Worker.
Manage a PostgreSQL + Prisma data model and background systems such as webhook handlers, queued messaging, and scheduled jobs.
Own security-sensitive paths and the AI layer, including LLM tool-calling over financial data and proactive insights.
GoFasti is a Talent-as-a-Service company that connects world-class developers and designers from Latin America with first-class companies around the globe. They make remote work remarkable and foster a culture of continuous learning, proactive communication, and strong attention to detail.
Design, develop, and maintain high-performance systems ensuring system rationality and reliability.
Collaborate with the team to shape technical architectures and drive innovative solutions.
Stay updated with emerging technologies and apply blockchain knowledge to the Web3 Wallet DEX project.
We are a leading global blockchain ecosystem behind the world's largest cryptocurrency exchange by trading volume and registered users. We are trusted by 300+ million people in 100+ countries for our industry-leading security and deep liquidity.
Leads a team of up to 8 backend engineers building Web3 infrastructure and blockchain services.
Balances 60% hands-on technical architecture with 40% people management and mentoring.
Drives delivery of Xsolla Bazaar, Web3 Backpack, blockchain services, and Web3 APIs using Go and ZK Stack.
Xsolla is a global commerce company providing tools and services to help video game developers fund, distribute, market, and monetize their games. Headquartered in Los Angeles, it has helped over 1,500 developers and fosters a remote-first, collaborative culture focused on creativity and play.
Design and build backend systems that are clean, testable, and efficient.
Architect scalable APIs and infrastructure for high-trust environments.
Own core systems end to end, and shape engineering practices and technical culture.
At Duna, we see the company as the second product we’re building and are continually working to create a transparent, ambitious culture. We are a remote-first, fast-moving team of builders backed by world-class investors, looking for exceptional people who love to create, build, and ship.
Own execution quality across the aggregation product, defining performance standards and improving transaction success rates.
Lead end-to-end onboarding of new liquidity sources and ecosystems, coordinating implementation and launch.
Collaborate with engineering, business development, QA, and data teams to translate complex technical challenges into actionable product priorities.
The company operates a technology product in the blockchain and decentralized finance ecosystem, focusing on performance, reliability, and reach. It is a collaborative, international, and remote-first organization that values ownership, continuous learning, and cross-functional teamwork.