• Develop robust, scalable backend systems using Java (11–17+), with a strong focus on Vert.x • Design and manage APIs using OpenAPI (YAML), SOAP, REST, and GraphQL • Integrate seamlessly with front-end technologies such as ReactJS, VueJS, Angular, and TypeScript • Implement event-driven and microservices-based architectures, including serverless functions where appropriate • Build scalable data solutions using JPA, Hibernate, MongoDB, NoSQL, and RDBMS (AWS/Azure) • Drive CI/CD pipeline implementation, performance tuning, and system monitoring using industry-standard tools • Champion clean code practices and Agile methodologies across development teams

This description is a summary of our understanding of the job description. Click on 'Apply' button to find out more. Role Description We’re looking for a high-agency backend engineer who thrives in a greenfield environment and likes building simple solutions for complex problems. As a Senior Backend Engineer at Decisionly, you’ll work directly with the CTO to shape the product and refine our technical vision. You’ll be an early hire at a fast-growing fintech startup, working across the stack and taking ownership of key projects as we scale our product and acquire customers. What You’ll Do - Research and develop new features for our backend infrastructure - Build and maintain secure, scalable APIs for our service - Incorporate compliance and security considerations into our Techstack - Design and deploy infrastructure using Terraform and modern DevOps practices - Integrate with third-party APIs to expand product footprint - Act as a technical point of contact for customers Qualifications - 3+ years of backend development experience within the payment industry - Experience working with clients - Experience with Node and/or Typescript - Experience with PostgreSQL or equivalent database - Able to tackle legacy systems or dense technical documentation with persistence and a sense of humor - Experience deploying LLMs to production environments - Familiarity with AWS, and preferably Terraform - A fast learner who thrives in a dynamic, unstructured environment - Experience in high-growth startups, fintech, enterprise SaaS, or regulated industries is a plus Requirements - Competitive compensation and equity package - Candidates must be authorized to work in the U.S. without sponsorship - We are a remote-first team, but candidates must be based in the U.S.

• Designing, developing, and maintaining production-grade backend software in Java • Delivering end-to-end features: from requirements analysis and design, through implementation, testing, deployment, and maintenance • Working closely with engineering, product, and delivery teams to align technical solutions with business goals • Participating in code reviews, pair programming, and knowledge sharing within the team • Contributing to CI/CD pipelines, automated testing, and DevOps practices to improve delivery efficiency • Continuously improving code quality, reliability, and maintainability of the system

• Leading the design and delivery of complex backend features and services, from concept through deployment and maintenance. • Developing high-quality, production-grade software using Java and Spring Boot, aligned with architectural standards. • Driving technical excellence by applying best practices, clean architecture principles, and robust testing strategies. • Mentoring junior and mid-level engineers through code reviews, pair programming, and design guidance. • Improving automation, reliability, performance, and overall engineering practices within the team. • Collaborating closely with product, delivery, and engineering teams to shape effective technical solutions. • Contributing to technical strategy and influencing patterns, standards, and long-term scalability.