Senior Software Engineer

Tereina; California; On-site; USD 140,000 - 190,000; Full time

Job summary

Tereina is building a cutting-edge B2B payments platform. As Senior Software Engineer on the Platform team, you will design and maintain critical systems for banking partner integrations and high-volume transaction processing, reporting to the Engineering Manager.

You will help ensure security, reliability, and scalability across services. You will collaborate with Product, Architecture, and other engineering teams to meet requirements and regulatory standards while driving architectural

Qualifications

• 5+ years in software engineering building scalable backend systems and APIs.
• Experience with commercial payments, fintech, or financial data handling.
• Strong proficiency in Java, Spring, and containerization (Kubernetes).
• Experience with microservices and cloud platforms (AWS, GCP, Azure).
• Designing distributed systems with databases, caching, and queues.
• Security-first mindset for financial services incl. encryption and secure APIs.
• Ability to leverage AI tooling to speed up development.

Responsibilities

• Platform development: design and implement core services and APIs for banking integrations.
• Integration engineering: build secure, scalable connections with financial institutions and networks.
• Code quality: write clean, tested code and participate in architectural decisions.

Skills

Java

Spring

Kubernetes

APIs

Distributed systems

Security

Cloud platforms

Problem-solving

Communication

Backend systems

AI tooling

Tools

GitHub Copilot

Claude Code

Job description

Tereina is on a mission to revolutionize B2B payments. We're a well-funded, early-stage startup supported by one of the largest software companies in the world, SAP. We’re building cutting-edge solutions that will transform the way businesses move money. Our platform handles cross-border payment processing, counterparty management, bank account administration, and compliance workflows for enterprise customers worldwide.

Quality engineering at Tereina is about earning confidence in every change we ship — from test strategy and quality tooling through release readiness and the quality evidence our partners and regulators rely on. Our goal is a zero-touch payment process, where payments flow straight through from initiation to the beneficiary without manual intervention. That only works if the software behind it holds up release after release, across every environment.

About the Role

As a Senior Software Engineer on the Platform team, you will be responsible for designing, building, and maintaining critical systems that enable our integrations with banking partners. You will report to the Engineering Manager and work alongside a talented team of engineers focused on creating scalable, reliable, and secure payment infrastructure. Your work will involve developing robust APIs, implementing secure transaction processing systems, and building the platform that facilitates high-volume financial transactions.

You will collaborate closely with Product, Architecture, and other Engineering teams to ensure our platform solutions align with product requirements and business objectives while maintaining the highest standards of security and reliability.

Key Responsibilities

• Platform Development: Design and implement core platform services, APIs, and infrastructure that support our banking integrations and payment processing systems.
• Integration Engineering: Build and maintain secure, scalable integrations with major financial institutions and payment networks.
• Code Quality & Best Practices: Write clean, maintainable, and well-tested code while contributing to architectural decisions and technical standards.
• System Reliability: Ensure high availability and performance of platform services, implementing monitoring, alerting, and error handling best practices.
• Cross-functional Collaboration: Work closely with Product, QA, and other Engineering teams to deliver features that meet business requirements and user needs.
• Technical Innovation: Identify opportunities to improve system performance, developer experience, and engineering processes. Drive improvements to internal tooling, contribute to shared infrastructure and company libraries, and help evolve our technical architecture.

Qualifications

• Experience: 5+ years in software engineering, with demonstrated experience building scalable backend systems and APIs and leading projects.
• Commercial Payments Knowledge: Understanding of commercial banking, payments processing, or fintech systems. Experience with financial data handling and compliance requirements preferred.
• Technical Expertise: Strong proficiency in Java, Spring framework, and containerization technologies like Kubernetes. Experience with microservices architecture and cloud platforms (AWS, GCP, or Azure).
• System Design: Experience designing and implementing distributed systems, with knowledge of database design, caching strategies, and message queues.
• Security-First Mindset: Understanding of security best practices, especially in financial services contexts, including data encryption, secure API design, and compliance requirements.
• AI Tooling Proficiency: Strong proficiency with modern AI coding assistants (e.g., Claude Code, GitHub Copilot, or similar) and a proven ability to leverage them to enhance engineering speed, quality, and impact.
• Problem-Solving Skills: Ability to debug complex issues, optimize performance, and architect solutions for high-scale systems.
• Communication & Collaboration: Strong written and verbal communication skills, with the ability to work effectively in a fast-paced, cross-functional environment.

Preferred Qualifications

• Experience with real-time payment systems or high-frequency transaction processing
• Knowledge of banking APIs, SWIFT messaging, or ACH processing
• Experience with event-driven architectures and stream processing
• Familiarity with enterprise DevOps practices and infrastructure as code

Why Join Us?

• Build Foundational Technology: Work on core platform services that will scale to handle millions of transactions and shape the future of B2B payments.
• Technical Growth: Tackle complex engineering challenges while working with cutting-edge technologies in the fintech space.
• Collaborate with Excellence: Work alongside experienced engineers from SAP and fintech innovators who value technical craftsmanship.
• Early-Stage Impact: Your code and architectural decisions will have direct impact on our product and company trajectory.
• Learning & Development: Gain deep expertise in financial technology, distributed systems, and high-scale platform engineering.

We're building transformative technology in payments and looking for curious, driven people to join us. Whether or not you meet every qualification, what matters most is your initiative, willingness to grow, and passion for building secure, performant, and user-friendly web applications.

We embrace AI as a powerful tool for innovation and welcome team members eager to leverage it in their work. As an equal opportunity employer, we’re committed to diversity, inclusion, and creating an environment where everyone can thrive.