Haystack
← Back to Jobs
Full time
Technology
SJ

Senior Staff Software Engineer

Selby JenningsManhattan, NY🇺🇸United StatesPosted Oct 13, 2026

Quick Overview

Seniority
Mid Senior
Employment type
Full Time
Work mode
Hybrid
Location
Manhattan, NY, United States
Posted
Yesterday
DockerGCPMicroservicesScalaAWSAzureBlockchainC++JavaKubernetesPython

Job Description


Senior Software Engineer

Location: Remote / Hybrid
Employment Type: Full-Time
Industry: FinTech / Financial Infrastructure


About the Role

A leading financial technology organization is seeking a Senior Software Engineer to join its growing engineering team. This individual will play a critical role in designing, building, and scaling distributed systems that support large-scale, mission-critical financial applications serving customers around the globe.

The successful candidate will have the opportunity to solve complex technical challenges related to scalability, reliability, performance, and security while contributing to technology that is transforming the movement of value worldwide.


Key Responsibilities
  • Design, develop, and maintain highly scalable backend applications and distributed systems.
  • Build and optimize infrastructure capable of supporting high-throughput transaction processing.
  • Partner with cross-functional teams to define technical requirements and system architecture.
  • Drive engineering best practices across software development, testing, observability, and deployment.
  • Identify and resolve performance bottlenecks in large-scale production environments.
  • Contribute to architectural decisions and long-term platform strategy.
  • Mentor engineers and help foster a culture of collaboration, innovation, and technical excellence.

Required Qualifications
  • 5+ years of professional software engineering experience.
  • Strong proficiency in one or more programming languages such as Java, Go, Python, Scala, or C++.
  • Experience designing and operating distributed systems in production environments.
  • Strong understanding of software architecture, APIs, databases, and cloud technologies.
  • Experience with microservices and cloud-native development practices.
  • Excellent problem-solving skills and the ability to work in a fast-paced environment.
  • Strong written and verbal communication skills.

Preferred Qualifications
  • Experience within fintech, payments, financial services, or blockchain technology.
  • Knowledge of Kubernetes, Docker, and public cloud platforms such as AWS, Azure, or GCP.
  • Experience working with real-time, event-driven, or high-availability systems.
  • Familiarity with large-scale transaction processing environments.

What the Company Offers
  • The opportunity to work on innovative technology that powers global financial infrastructure.
  • Challenging engineering problems with meaningful real-world impact.
  • Competitive compensation, including base salary, bonus, and equity.
  • Comprehensive health and wellness benefits.
  • Flexible work arrangements and career growth opportunities.
  • A collaborative, high-performing engineering culture focused on innovation and ownership.

Similar jobs