Senior Backend Engineer Location: US or Europe (Must have solid overlap with EST) Remote | Full-time Compensation: $150K - $200K Our client is an industry-leading DeFi organization building the next generation of trading infrastructure. Operating as the largest builder-code product on a major decentralized exchange protocol, the company has processed over $65B in cumulative trading volume and generated eight-figure revenue over the past year. With a user base exceeding 400,000 registered traders, the platform is at the forefront of democratizing access to global financial markets across crypto, equities, and commodities. The organization operates as a lean, highly technical team of individual contributors who prioritize autonomy, ownership, and rapid execution. This environment is designed for a Senior Backend Engineer who thrives in 0-to-1 environments and is capable of building ambitious systems from the ground up. This role is central to scaling trading interfaces that manage billions of dollars in daily volume while maintaining high-speed, intuitive user experiences. Key Responsibilities - System Architecture: Own and drive architectural decisions for the client’s backend systems to ensure scalability and reliability. - Data Pipelines: Build and operate high-performance, real-time data pipelines for order book updates, trade executions, and market events. - API Management: Design and maintain the API layer (utilizing GraphQL and WebSockets) to serve high-traffic web and mobile clients. - Database Optimization: Work extensively with ClickHouse, PostgreSQL, and Redis to manage and query high-volume trading data efficiently. - Performance Monitoring: Instrument services with comprehensive metrics and alerting systems; participate in on-call rotations to ensure 24/7 system availability. - Technical Troubleshooting: Debug complex latency issues, memory management problems, and system reliability concerns under heavy load. - Cross-Functional Collaboration: Partner with frontend and mobile engineers to ensure analytical data is served effectively via API. Interview Process - Initial Interview: Discussion with the Founder / CEO. - Technical Assessment: First-round technical interview. - Deep Dive: Second-round technical interview. - Final Review: Final interview with the leadership team.

Senior Software Engineer Location: US or EU (remote-first, office optional). Must be in the US, not Canada or in the European Union. France or Paris or as close as possible, always preferred. Remote | Full-time Compensation: $160K - $240K Our client is an industry-leading organization comprised of experts in blockchain technology, cryptography, infrastructure, and security. The organization is currently developing the foundational wallet infrastructure for the next generation of global finance. The Senior Software Engineer will design, develop, and scale core backend services for a high-performance platform. This role involves full ownership of critical projects—ranging from APIs and microservices to databases and developer tooling—ensuring all systems remain fast, reliable, and secure. Beyond hands-on engineering, this individual will contribute to architectural decisions, refine development processes, and ensure infrastructure resilience under real-world financial workloads. This position requires close collaboration with product, security, and leadership teams to transform complex requirements into elegant, production-ready systems. Key Responsibilities - System Development: Design, build, and maintain secure, scalable backend services and RESTful APIs. - Architecture: Architect databases and microservices optimized for performance, reliability, and long-term growth. - Project Ownership: Manage the full software development lifecycle (SDLC), from initial requirements and implementation to production deployment and iteration. - Performance Optimization: Troubleshoot complex technical issues, resolve performance bottlenecks, and ensure system resilience. - Engineering Excellence: Contribute to CI/CD pipelines, observability, and the continuous improvement of development standards. - Cross-Functional Collaboration: Partner with product and security teams on technical roadmaps and strategic direction. - Documentation: Maintain comprehensive system documentation and support client-facing technical discussions.

• Apply a data-driven approach to a wide variety of signals to identify emerging Cybersecurity fraud trends and tactics. • Developing ideas for new products or features by monitoring industry developments and executing quick proof of concepts. • Take advantage of efficiencies from AI coding tools and AI first mind-set to solve customer pain points • Participate in the full development cycle: design, develop, test, analyze, and deploy. • Design, implement, and maintain scalable and high-performance APIs and backend systems. • Experience working with microservice architecture and containerized services. • Work closely with cross-functional teams, including product managers, UX designers, QA engineers, and customer-facing teams, to deliver high-quality software. • Strong communication and collaboration skills

• Architect and scale Groundhawk’s backend platform, building the services and data pipelines that connect field data capture with customer workflows while handling geospatial data at scale • Design and build backend services using Python and Node.js, evolving our API architecture • Build and operate data pipelines that ingest, process, and serve geospatial data at scale • Own and improve our microservices architecture, ensuring reliability and performance • Collaborate with ML engineers on processing pipelines for 3D point clouds and sensor data • Optimize database performance and query patterns across PostgreSQL / PostGIS • Drive infrastructure improvements on AWS, including observability, CI/ CD and scaling