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About the Role

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.

Responsibilities

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

Requirements

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.
Thorough understanding of consistency models, idempotency, fault tolerance, and sagas, with experience designing systems that remain correct under partial failure conditions.
Prior experience in payments, fintech, high-throughput transaction processing, or another domain where system correctness is vital and "mostly works" is unacceptable.
Deep knowledge of transactions, indexing, query/caching strategies, event streaming, and a strong respect for auditability and reconciliation.
Natural adherence to secure engineering practices, including secrets hygiene, least-privilege access, and maintaining clean audit trails.
Ability to make high-impact technical decisions independently, navigate ambiguity comfortably, and execute both high-level design and necessary reliability work.

Skills

Rust
Go
C++
Java
Scala
Distributed Systems
Asynchronous patterns
Event-driven patterns
Database strategies
Transaction management
Security protocols
Audit trails
Continuous Delivery
Performance optimization
Profiling
Reducing allocations
Lock-free structures
Payment rails
Accounting fundamentals
Risk infrastructure
Fraud infrastructure
Compliance infrastructure
Crypto
Web3
On-chain infrastructure
Platform engineering
Cloud infrastructure
Observability

Location

New York, United States
London, United Kingdom

Work Type

On-Site
Full-time

Experience Level

Staff
Senior

Salary/Compensations

Competitive Compensation
Highly competitive base salary

Benefits

Generous equity and token allocation, offering direct alignment with the long-term growth and success of the platform.
A culture that trusts professional judgment, providing the freedom to make critical decisions without layers of bureaucratic approval.
The opportunity to build core infrastructure for a globally dominant platform shaping the future of digital interaction and decentralized finance.

About the Company

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.

Equal Opportunity

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 human-resources@mlabs.city.
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 legal@mlabs.city.