Staff Software Engineer (Payments)

Job Description

Location: New York, United States

London, United Kingdom (Office)

On-Site | Full-time

Compensation: Competitive Compensation

Our client is a high-growth software development company and a major contributor to one of the largest and fastest-growing crypto social networks globally. Operating in a high-velocity, high-impact environment, the organization builds cutting-edge infrastructure that supports massive global transaction volumes and substantial revenue generation.

The organization is seeking a Staff Software Engineer (Payments) to design and build the core payment services at the center of this ecosystem. This is a senior, high-ownership role designed for an engineer who thrives on solving hard, ambiguous problems end-to-end—from the moment money enters the system to final settlement, reconciliation, and delivery.

Operating within a lean team of highly experienced engineers, the successful candidate will focus on 0?1 development, moving quickly while maintaining the absolute rigor required for financial systems. The engineering culture prioritizes low bureaucracy, continuous production deployment, and trust in individual judgment over rigid processes.

Key Responsibilities

End-to-End Ownership: Take full ownership of complex payment infrastructure challenges, carrying projects from initial architectural design through to production implementation and on-call support
Core Payment Services: Design, build, and optimize high-performance, mission-critical systems governing money movement, transaction processing, and ledgers
System Architecture: Develop resilient distributed systems using asynchronous and event-driven patterns, ensuring fault tolerance, strict consistency models, and exactly-once semantics
Data Integrity & Security: Implement robust database strategies, transaction management, and security protocols, ensuring absolute data correctness, key management hygiene, and comprehensive audit trails
Continuous Delivery: Ship high-quality code to production continuously, balancing a bias for action with the deliberate precision required for financial infrastructure

Requirements

Core Qualifications

Strong Backend / Systems Engineering: Proven track record of building high-performance, critical infrastructure. Deep experience in Rust is highly advantageous, but strong engineers from other systems backgrounds (such as Go, C++, or Java/Scala) who can rapidly adapt to Rust will be fully considered
Distributed Systems Expertise: Thorough understanding of consistency models, idempotency, fault tolerance, and sagas, with experience designing systems that remain correct under partial failure conditions
Financial or Transactional Rigor: Prior experience in payments, fintech, high-throughput transaction processing, or another domain where system correctness is vital and "mostly works" is unacceptable
Advanced Database Fundamentals: Deep knowledge of transactions, indexing, query/caching strategies, event streaming, and a strong respect for auditability and reconciliation
Security-First Instinct: Natural adherence to secure engineering practices, including secrets hygiene, least-privilege access, and maintaining clean audit trails
Autonomy & Leadership: Ability to make high-impact technical decisions independently, navigate ambiguity comfortably, and execute both high-level design and necessary reliability work

Preferred Attributes (Nice To Have)

Deep Rust experience, open-source contributions, or performance optimization skills (profiling, reducing allocations, lock-free structures)
Domain depth in payment rails (card networks, bank rails, chargebacks, open banking) or accounting fundamentals (double-entry ledgers, regulatory reporting)
Experience building risk, fraud, or compliance infrastructure (rule engines, device fingerprinting, sanctions screening, KYC/AML workflows)
Familiarity with crypto, Web3, or on-chain infrastructure (wallet infrastructure, stablecoin flows)
A background in platform engineering, cloud infrastructure, or observability

Benefits

Competitive Compensation: Highly competitive base salary
Equity & Upside: Generous equity and token allocation, offering direct alignment with the long-term growth and success of the platform
High Autonomy: A culture that trusts professional judgment, providing the freedom to make critical decisions without layers of bureaucratic approval
Impact: The opportunity to build core infrastructure for a globally dominant platform shaping the future of digital interaction and decentralized finance

Interview Process

Recruiter / HR Screening Call
Founder / CEO Interview
Initial Technical Interview
Final Technical Interview

Due to the high volume of applications we anticipate, we regret that we are unable to provide individual feedback to all candidates. If you do not hear back from us within 4 weeks of your application, please assume that you have not been successful on this occasion. We genuinely appreciate your interest and wish you the best in your job search.

Commitment to Equality and Accessibility:

At MLabs, we are committed to offer equal opportunities to all candidates. We ensure no discrimination, accessible job adverts, and providing information in accessible formats. Our goal is to foster a diverse, inclusive workplace with equal opportunities for all. If you need any reasonable adjustments during any part of the hiring process or you would like to see the job-advert in an accessible format please let us know at the earliest opportunity by emailing [email protected].

MLabs Ltd collects and processes the personal information you provide such as your contact details, work history, resume, and other relevant data for recruitment purposes only. This information is managed securely in accordance with MLabs Ltd's Privacy Policy and Information Security Policy, and in compliance with applicable data protection laws. Your data may be shared only with clients and trusted partners where necessary for recruitment purposes. You may request the deletion of your data or withdraw your consent at any time by contacting [email protected].