Senior MERN Engineer

Access Search, Inc.; Chicago (IL); On-site; USD 120,000 - 180,000; Full time

Job summary

Access Search, Inc. is seeking a Senior Software Engineer to build and enhance the payment infrastructure that powers high-throughput processing.

You will develop payment orchestration services, merchant-facing APIs, and real-time settlement systems to handle large financial activity. You will collaborate with product and engineering teams to translate business requirements into reliable, scalable software, driving performance improvements and system observability while delivering

Qualifications

• Five+ years of software engineering experience.
• Strong skills in TypeScript and Node.js with API design expertise.
• Experience with cloud platforms and containerized deployments.
• Familiarity with distributed systems and high-volume transaction processing.

Responsibilities

• Build and enhance payment systems and backend services for high throughput.
• Create developer-friendly APIs and tools for external partners integration.
• Improve fraud prevention, data accuracy, and system resilience under heavy load.
• Design distributed, observable architectures with scalable databases and caching.

Skills

TypeScript

Node.js

React

API design

Distributed systems

Cloud platforms

Containerization

Tools

PostgreSQL

NoSQL

Docker

Kubernetes

Job description

A fast-growing technology company is building modern payment infrastructure designed to support global commerce. Its platform leverages stablecoins, advanced fraud detection powered by artificial intelligence, and real-time settlement to help businesses move money more efficiently. The solution offers capabilities such as instant settlement, protection against fraud and chargebacks, global payment acceptance, multi-currency foreign exchange, and streamlined payout functionality. Clients include marketplaces, financial technology companies, remittance providers, gaming platforms, and online merchants operating across international markets.

Since launching in 2023 and completing an early funding round in 2024, the organization has experienced rapid expansion, achieving significant revenue growth and reaching multi-billion-dollar annual transaction volume. A subsequent Series A funding round in late 2025, backed by prominent investors in venture capital and digital assets, is supporting continued product innovation and global scale.

About the role

This opportunity is for a Senior Software Engineer to play a key role in developing and enhancing the systems that power high-volume payment processing. You will work on building critical infrastructure components, including payment orchestration services, merchant-facing APIs, and real-time settlement systems that handle large-scale financial activity

.The position offers strong ownership and visibility, with the expectation that your work will move quickly from development into production. You will partner with product stakeholders to define requirements and collaborate with engineering peers to design and deliver reliable, scalable solutions

Key responsibilities

• Build and enhance payment systems
• Design and deliver backend services capable of processing high volumes of transactions with accuracy and reliability
• Create developer-friendly APIs and tools that enable seamless integration for external partners
• Develop and refine fraud prevention and risk management capabilities using live data signals
• Drive scalability and performance
• Design distributed systems that are resilient, observable, and performant under heavy load
• Improve database efficiency, caching strategies, and service-to-service communication
• Implement monitoring and alerting practices to maintain system health in production
• Own projects from initial design through deployment and ongoing iteration
• Collaborate closely with cross-functional teams to translate business needs into technical solutions
• Contribute to architectural direction, tooling choices, and development standards

Qualifications

• At least five years of experience in software engineering
• Strong skills in TypeScript and Node.js, with additional experience in frontend frameworks such as React considered helpful
• Solid understanding of API design, database systems including both relational and document models, and distributed system principles
• Experience building or maintaining systems that require high reliability or handle significant transaction volume
• Familiarity with cloud platforms and modern deployment approaches such as containerization
• Proven ability to deliver and maintain production-grade software
• Effective communication skills and the ability to collaborate across technical and non-technical teams
• Background in payments, financial technology, or blockchain-related systems is beneficial