Senior Payments Infrastructure Engineer — Crypto, Wallets & Blockchain

Accountabilities

• Take ownership of the existing payments backend, understand its architecture and codebase, and complete integration, testing, and production deployment.

• Complete and optimize payment processing, settlement, reconciliation, and balance-accounting functionality.

• Develop and maintain reliable financial ledger systems, ensuring transaction consistency, auditability, idempotency, and accurate double-entry accounting.

• Integrate and manage digital wallets and cryptocurrency payment flows, including deposits, withdrawals, transfers, transaction signing, and secure key management.

• Implement and maintain institutional custody integrations, particularly Fireblocks or comparable platforms, covering wallet administration, custody APIs, transaction authorization, and security policies.

• Integrate existing financial services through REST and gRPC APIs, including payment gateways, banking services, fiat on/off ramps, and cryptocurrency exchanges.

• Troubleshoot distributed systems and resolve integration challenges across microservices, databases, blockchain infrastructure, and external financial services.

• Build transaction recovery, monitoring, and fault-tolerance mechanisms to handle duplicate processing, partial failures, reconciliation discrepancies, and other exceptional scenarios.

• Conduct automated integration and end-to-end testing to validate payment flows and ensure production readiness.

• Deploy and operate secure, scalable infrastructure using cloud and container technologies, with appropriate monitoring and CI/CD practices.

• Apply security engineering practices across encryption, access controls, secrets management, transaction authorization, and digital asset transfers.

• Collaborate with backend, infrastructure, blockchain, and financial engineering teams, maintaining clear technical documentation and communication.

• Make pragmatic engineering decisions that prioritize completing and strengthening existing systems rather than rebuilding components unnecessarily.

Requirements:

• At least 8 years of professional backend engineering experience, including substantial hands-on responsibility for production financial systems, payment infrastructure, cryptocurrency platforms, or digital asset services.

• Proven experience building and operating financial transaction systems covering payment processing, settlement, reconciliation, and balance management.

• Strong understanding of double-entry accounting and financial ledger architecture, including transaction consistency, idempotency, auditability, and failure recovery.

• Production experience with digital wallets and cryptocurrency payments, including deposits, withdrawals, transfers, transaction signing, and secure key management.

• Experience integrating Fireblocks or comparable institutional custody platforms, including custody APIs, wallet administration, transaction authorization, and security controls.

• Advanced proficiency in Rust, Go, or another high-performance backend language, with the ability to work effectively within Rust-based microservices.

• Strong knowledge of distributed systems, REST and gRPC APIs, asynchronous processing, concurrency, fault tolerance, and event-driven architectures.

• Solid database engineering experience with PostgreSQL or comparable transactional databases, including ACID guarantees, concurrency control, and data integrity.

• Production experience with AWS, Docker, CI/CD pipelines, monitoring, and infrastructure security for mission-critical services.

• Deep understanding of blockchain transaction infrastructure, cryptographic signing, wallet architecture, and secure digital asset transfers.

• Experience integrating third-party financial services, such as payment gateways, banking APIs, fiat on/off ramps, or cryptocurrency exchanges.

• Strong security engineering knowledge covering encryption, access controls, secrets management, transaction authorization, and financial-system security practices.

• Ability to independently investigate unfamiliar codebases, own complex production systems, resolve integration issues, and deliver reliable solutions without unnecessary redesign.

• Experience with automated integration and end-to-end testing of financial transactions, including duplicate processing, partial failures, reconciliation discrepancies, and recovery scenarios.

• Strong technical documentation, communication, and cross-functional collaboration skills.

• An adaptable, entrepreneurial mindset, with the ability to work through ambiguity, changing priorities, and the evolving needs of an early-stage venture.

• Creative problem-solving skills and the confidence to challenge existing approaches and propose practical improvements.

• Highly preferred: Direct production experience with Fireblocks and TigerBeetle; hands-on Rust development in financial or high-throughput distributed systems; Solana and SPL token integrations; experience with cryptocurrency exchanges, payment orchestration, custody infrastructure, or treasury systems; familiarity with KYC/AML, PCI DSS, and financial services compliance; and a track record of deploying financial infrastructure that handles real customer funds at production scale.

• An interest in football and international sports is an advantage.

Benefits:

• Opportunity to help build a global technology platform and take meaningful ownership of critical financial infrastructure.

• Entrepreneurial environment with autonomy, independence, and the opportunity to influence technical decisions.

• Deferred compensation arrangement: compensation is agreed upon but payments are deferred until funding is secured.

• Once funding is secured, the arrangement is intended to transition to a competitive, normalized salary, together with equity and OleX token ownership.

• Participation in the long-term ownership and potential success of the venture.

• The deferred compensation model applies across the team, including the founder.

• This opportunity involves early-stage startup risk and uncertainty around the timing of funding and compensation payments.

• The role is associated with Austin, Texas, and requires some travel. The position is listed for the United States; specific remote or office arrangements are not detailed.