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About the Role

As a Fullstack Software Engineer, you will be pivotal in designing, building, and maintaining web applications and the APIs that power them. You’ll focus on crafting intuitive, secure, and responsive UIs while architecting backend systems that support large-scale financial transactions with real-time processing capabilities. In an agile environment, you’ll report to the Engineering Manager and work alongside a cross-functional team of engineers, designers, and product managers. This role is ideal for someone who enjoys working across the stack, thrives in early-stage environments, and is passionate about building secure, compliant financial technology.

Responsibilities

Build and maintain modern, responsive, and secure web applications using ReactJS with TypeScript, focusing on performance and accessibility.
Leverage React-based libraries to create enterprise-grade UI components that meet financial industry standards.
Design, build, and maintain RESTful APIs and GraphQL endpoints.
Design efficient data models and work with SQL and NoSQL databases to securely handle transactional and analytical workloads.
Implement websockets, message queues, and event-driven architectures to support real-time payment processing and notifications.
Write comprehensive tests using Jest, Cypress, or Playwright to ensure system stability, and participate in code reviews to maintain high code quality standards.
In compliance with financial regulations, apply advanced security practices, including CSP implementation, secure coding principles, data encryption, and vulnerability assessment.
Implement data compression, caching strategies, CDN optimization, and monitoring to enhance speed, scalability, and system observability.
Work closely with Product, Design, and Platform teams in an agile environment to deliver features that delight customers while meeting compliance and reliability standards.
Participate in code reviews and knowledge sharing, and mentor junior developers as the team grows.

Requirements

5+ years of software engineering experience, including significant fullstack development focusing on frontend applications and backend API development.
Strong proficiency in ReactJS and modern JavaScript/TypeScript
Solid experience with backend frameworks (Node.js, Java/Spring, or similar)
Hands-on experience with both SQL and NoSQL databases
Understanding of data modeling and database optimization
Hands-on experience with Jest, Cypress, Playwright, or other modern testing frameworks, focusing on test-driven development.
Experience designing scalable web applications, microservices architecture, and API integration patterns.
Experience with Scrum/Agile methodologies, sprint planning, and collaborative development practices.
Ability to debug and optimize for performance, security, and reliability.
Excellent communication skills in a collaborative, fast-paced environment.
Background in fintech, banking APIs, payment processing, or commercial payments systems.
Experience with websockets and real-time data processing.
Exposure to enterprise-grade UI/UX standards in regulated industries.

Skills

ReactJS
TypeScript
JavaScript
Node.js
Java/Spring
SQL
NoSQL
Jest
Cypress
Playwright
Websockets
Message Queues
Event-driven architectures
RESTful APIs
GraphQL
Data Modeling
Database Optimization
Web Security
CSP implementation
Secure Coding Principles
Data Encryption
Vulnerability Assessment
Data Compression
Caching Strategies
CDN Optimization
Monitoring
System Observability
Agile Methodologies
Scrum
Sprint Planning
API Integration Patterns
Microservices Architecture

Location

Remote

Work Type

Full-time

Experience Level

5+ years

Benefits

Cutting-Edge Work
End-to-End Impact
Security & Scale
Early-Stage Growth
Learning & Development
Team Culture

About the Company

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.

Equal Opportunity

As an equal opportunity employer, we’re committed to diversity, inclusion, and creating an environment where everyone can thrive.