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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Software Engineer, Fiat Payments & Banking Infrastructure - **Company:** zerohash trust company llc - **Location:** United States (Remote available) - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Application Programming Interfaces (APIs), Data Distribution Service, Database Schema, Digital Assets, Distributed Systems, Payment Systems, Transport Layer, Messaging Application Programming Interface, Software Engineering, SQL Databases, Systems Integration, ZeroMQ (Concurrent Programming Libraries), System Availability, Build Management, Information Technology, Apache Kafka, Api Management, Golang, Microservices - **Published:** October 30, 2026 - **Apply:** https://www.careerbuilder.com/job-details/senior-software-engineer-fiat-payments-banking-infrastructure--728d3fb0-03f4-472d-8d01-2d97bb8814f0 ## About the Role Software Engineering, Banking Services, Software Engineering, Financial Systems, Banking Services, Finance, Detail Oriented, Realtime Transport Protocol, Request for Proposals (RFP), Application Programming Interface (API), zerohash is looking for a Senior+ Software Engineer to architect and build our fiat payment systems, scaling our gateway to Finance 2.0. We are a high-performing team looking for an equally ambitious and driven teammate. The right candidate for this position is detail-oriented, deeply technical, and driven by the challenges of complex financial systems. You are eager to build secure, resilient, and highly scalable banking infrastructure. If you are looking to have a massive impact in a high-growth startup bridging the gap between traditional finance and digital assets, you will find this role uniquely challenging and rewarding., * 7+ years of software engineering experience, specifically focused on Payments, FinTech, or Banking-as-a-Service (BaaS) infrastructure. * Deep proficiency with Golang in a production environment. * Extensive understanding of traditional fiat networks and clearing systems (e.g., ACH, RTP, FedNow, SEPA, Swift). * Strong expertise in SQL and complex database schema design for high-throughput, ACID-compliant financial ledgers. * Hands-on experience developing, integrating, and maintaining resilient connections with bank APIs and third-party payment processors. * A humble and scrappy get-it-done mindset; you're resourceful and in your element going from 0 to 1. * Excellent problem-solving skills; you can systematically troubleshoot complex distributed systems. * Comfort with ambiguity; the ability to independently lay out and test clear hypotheses, and solve architectural problems without well-defined direction. * Excellent verbal and written communication skills. Preferred Qualifications * Bachelors in Computer Science or equivalent experience. * Experience at a banking-as-a-service, brokerage-as-a-service, or payment-as-a-service business. * Proven track record of building treasury management or automated ledgering systems from scratch. * Experience with digital assets and crypto infrastructure. * Experience with distributed systems design and messaging frameworks (e.g., Kafka, ZeroMQ, or NATS) for data distribution and persistence., * Independence/Ownership - An ability to work autonomously. Join zerohash, pitch ideas, and shape the work you do. * Passion - We are innovating quickly and challenging the status quo. We want you to think big, be creative and make a difference every day. * Collaborative - A good attitude and respect for others. We're teammates, not co-workers. Everything we do is a shared success and equally a shared failure - we talk in terms of "we" not "me". * Initiative - An ability and passion for learning and asking questions. We will champion you, challenge you and push you to achieve your best - and we expect you to do the same. * Empathy - An ability to listen, respect, and understand your co-workers, customers, and everyone you interact with no matter how different they are to you. * Adaptability - An ability to respond quickly. We are in a fast-paced industry and so we expect you to be creative when solving a new problem and comfortable under pressure. * Transparency - We believe that transparency is critical to empowering everyone to make the best decisions, both the company to its people and vice versa. * Integrity - Integrity creates trust. As both an organization collectively and as individuals, it is our most valuable asset. ## Description * Fiat Payments: Building and maintaining robust fiat rails such as ACH, RTP, FedNow, RFP in the US, and SEPA in Europe. * Banking Infrastructure: Direct API integrations with top-tier banking partners. * Treasury Management: Developing sophisticated software to autonomously manage and reconcile balances across banking networks. * Operational Tooling: Creating internal tooling to streamline financial operations and scale our capacity to handle millions of transactions securely. Responsibilities * Lead the architectural design and hands-on development of our global fiat payment rails (ACH, RTP, FedNow, Request for Pay, and SEPA). * Architect, implement, and scale seamless API integrations into our banking partners' systems. * Design and build robust treasury management software for internal operations, allowing programmatic liquidity management and automated balance transfers between partner banks. * Develop robust internal operational tooling to support reconciliation, automated alerts, financial operations, and compliance reporting. * Support the company's vital business by contributing to the design and development of software in an event-driven microservices environment. * Develop microservices, primarily utilizing Golang. * Work closely with platform engineers to set up new services and scale existing infrastructure. * Respond to production issues and alerts, ensuring high availability of our payment gateways. * When necessary, communicate directly with banking partners and client technical teams to resolve complex integration issues.