As a fast-growing company in the highly competitive, quantitative capital markets industry, ElectronX values candidates who are resourceful, curious and adaptable to change. Our cultural focus on innovation requires collaborative and entrepreneurial teammates with the intellectual grit necessary for near- and long-term success. We are seeking an experienced Senior Software Engineer to help build the foundation of our exchange. You'll ship the core trading infrastructure our market runs on: the matching engine, market data distribution, our customer-facing trading interface, APIs for market participants and clearinghouses, real-time surveillance and monitoring, and the data pipelines behind trade reporting and analytics. You'll own architectural decisions that balance performance, reliability, and CFTC regulatory requirements, and weave security and compliance into how we build. Beyond the code, you'll help evolve our engineering principles as the team grows, mentor new hires, and partner closely with Product, Design, Compliance, Infrastructure, and our earliest customers to turn real market needs into production systems. What will you be doing? Build Core Exchange Infrastructure • Design and implement our trading engine, order matching system, and market data distribution platform • Develop, ship, and iterate our customer-facing trading interface • Build APIs and integrations for market participants, clearinghouses, and data vendors • Develop real-time market surveillance and monitoring systems • Create admin tools and internal dashboards for operations and compliance teams • Build scalable data pipelines for market data, trade reporting, and analytics Own Technical Architecture • Design systems that balance performance, reliability, and regulatory requirements • Contribute to evolving team standards for engineering best practices, code quality, and development workflows • Implement security controls and compliance-focused engineering practices Raise the Engineering Bar • Champion and evolve our engineering principles as the team grows • Contribute to strong documentation and knowledge-sharing across the team • Mentor teammates and help new hires ramp up • Reinforce a culture of ownership, quality, and continuous improvement Collaborate Cross-Functionally • Collaborate with the Product and Strategy and Design teams to translate market needs into technical solutions • Work with compliance and legal teams to ensure systems meet CFTC regulatory requirements • Coordinate with infrastructure and security teams on deployment and monitoring • Engage directly with early customers and trading firms to understand their needs What we need from you Technical Acumen • Bachelor's degree in Computer Science, Engineering, or a related field (or equivalent practical experience) • 5+ years of full-stack software engineering experience, with a proven ability to build systems from scratch • Expert-level proficiency in at least one backend language; Python and/or Go preferred • Expert-level proficiency in TypeScript and React • Experience designing, building, and deploying APIs, services, and user-facing applications • Strong understanding of distributed systems, API design, and scalability patterns • Experience with relational databases (PostgreSQL, MySQL) and data modeling • Experience with version control (Git), CI/CD, and modern development tooling • Working knowledge of software security best practices • Ability to write clean, maintainable, well-tested code The Right Mindset • Ownership mentality: You take full responsibility for your work from conception to production • Bias for action: You'd rather ship and iterate than over-engineer for hypothetical futures • Entrepreneurial spirit: You're energized by building something new and comfortable with startup uncertainty • High agency: You identify problems and solve them without waiting for permission Preferred Experience • Financial services or trading systems experience - trading platforms, market data, order routing, or exchange technology • High-performance systems experience - low-latency or high-throughput systems (matching engines, pricing systems, real-time data processing) • Regulated environments - fintech, healthcare, or other compliance-heavy industries • Early-stage startup experience as one of the first 10 engineers helping scale a company • Cloud platforms (GCP, AWS, Azure) and infrastructure as code • Familiarity with FIX protocol or other trading protocols • Understanding of derivatives, futures, or commodities markets • Experience with real-time systems and WebSocket / streaming technologies • DevOps experience (Docker, Kubernetes, Terraform) • Background in data engineering or analytics infrastructure • Passion for energy markets, clean energy, or climate tech Benefits • Health, vision and dental insurance • 401(k) match • Supplemental health and disability insurance • Unlimited vacation • Parental leave