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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Full Stack Developer - **Company:** The Office - **Location:** Concord, NH, United States - **Experience:** Expert - **Salary:** $120,000.0 - $150,000.0 - **Contract:** Permanent contract - **Skills:** Java (Programming Language), Application Programming Interfaces (APIs), Agile Methodology, Artificial Intelligence, Amazon Web Services, User Authentication, Automation of Tests, Software as a Service, Cloud Computing, Code Review, Databases, Continuous Delivery, Continuous Integration, Relational Databases, Database Design, Software Debugging, DevOps, Programming Tools, Electronic Data Interchange (EDI), UN Electronic Data Interchange for Administration Commerce and Transport, Github, Design of User Interfaces, Human-Computer Interaction, PostgreSQL, Enterprise Messaging Systems, Microsoft SQL Server, OAuth, Oracle Databases, Oracle (Applications), PCI Data Security Standards, Performance Tuning, Systems Development Life Cycle, RabbitMQ, Standard Sql, Secure Coding, Single Sign-On, Software Engineering, SQL Databases, Software Testing Automation Framework, Software Technical Review, Enterprise Software Applications, GitHub Copilot, ReactJS, System Availability, Database Optimization, Spring-boot, Software Security, Backend, Git, Containerization, Kubernetes, Information Technology, Apache Kafka, Front End Software Development, Restful APIs, Code Restructuring, Docker, Web Api - **Published:** September 23, 2026 - **Apply:** https://www.careerbuilder.com/job-details/senior-full-stack-engineer-payments-concord-ca--a645dd28-cae0-4504-be0e-e06ba2e15073 ## About the Role * Bachelor's degree in Computer Science or related field, or equivalent experience * 5+ years of full-stack development experience * Strong experience with Java and Spring Boot * Strong Experience designing and consuming RESTful APIs * Strong knowledge of SQL and relational databases such as PostgreSQL, Oracle, or SQL Server * Experience with React and modern front-end frameworks * Experience with Git and modern CI/CD pipelines * Experience building cloud-based applications (AWS preferred) * Excellent analytical and problem-solving skills * Strong communication and collaboration skills * Strong understanding of Agile development methodologies Nice to Have * Experience working on payment processing, fintech, banking, healthcare payments, or financial services platforms * Experience integrating with third-party APIs and secure payment gateways * Knowledge of OAuth2, JWT, SSO, and modern authentication frameworks * Familiarity with AI-assisted development tools (Claude Code, GitHub Copilot, etc.) * Experience with Docker, Kubernetes, and containerized deployments * Familiarity with messaging platforms such as Kafka or RabbitMQ * Experience with performance tuning, observability, and production monitoring * Knowledge of secure coding practices and regulatory requirements * Experience with payment reconciliation and settlement system * Experience with PCI DSS or other financial compliance standards * Knowledge of healthcare payment workflows and EDI transactions * Experience with test automation frameworks * Experience supporting mission-critical, high-availability systems Pay Transparency, Agile Programming Methodologies, Alliance/Partner Marketing, Analysis Skills, Apache Kafka, Application Programming Interface (API), Applications Security, Artificial Intelligence (AI), Authentication, Banking Services, Best Practices, Claims Management, Claims Processing, Cloud Computing, Code Reviews, Communication Skills, Computer Science, Continuous Deployment/Delivery, Continuous Integration, Database Design, Database Optimization, Database Technology, Debugging Skills, DevOps, Disbursements, Docker, Ecosystems, Electronic Data Interchange (EDI), Enterprise Applications, Financial Compliance, Financial Services, Git, GitHub, Government, Healthcare, Healthcare Administration, Healthcare Providers, High Availability, Identify Issues, Insurance, Insurance Claims, Java, Microsoft SQL Server, OAuth, Oracle Database, PCI-DSS, Patient Care, Payment Processing, Performance Tuning/Optimization, PostgreSQL, Problem Solving Skills, Production Control, Programming Tools, Quality Assurance, REST (Representational State Transfer), RabbitMQ, React.js, Reconciliation, Refactoring, Regulatory Compliance, Regulatory Requirements, Relational Databases (RDBMS), Revenue Management, Root Cause Analysis, SQL (Structured Query Language), SQL Databases, Scalable System Development, Secure Coding, Service Delivery, Single Sign-On (SSO), Software Development Lifecycle (SDLC), Team Player, Technical/Engineering Design, Test Automation, User Interface/Experience (UI/UX) ## Description We are seeking an experienced Senior Full Stack Developer to help build ProPay2.0, our next-generation payment platform and financial infrastructure. In this role, you will design, develop, and support highly scalable, secure payment solutions that process ACH, virtual card, check, and other digital payment transactions while contributing to the architecture and evolution of our payment platform., * Design, develop, and maintain scalable full-stack applications for enterprise payment processing * Build scalable front-end applications using React and modern UI frameworks * Develop secure, high-performance backend services and RESTful APIs * Use AI-assisted development tools (Claude Code, Copilot, etc.) to accelerate coding, refactoring, and debugging * Design and optimize relational database schemas and SQL queries * Integrate with external payment providers, banking partners, and third-party APIs * Ensure applications meet security, compliance, and performance requirements * Participate in architecture discussions and technical design reviews * Participate in code reviews and uphold engineering best practices across the team * Identify opportunities to improve system design, performance, and developer productivity * Troubleshoot production issues and identify root causes * Write automated unit, integration, and end-to-end tests * Collaborate closely with Product, QA, DevOps, and Operations teams throughout the software development lifecycle ## Related Videos - [How a Small Team Shrank a Microsoft Monorepo by 94%](https://www.wearedevelopers.com/videos/1236-how-a-small-team-shrank-a-microsoft-monorepo-by-94) - [Keeping applications secure by evolving OAuth 2.0 and OpenID Connect](https://www.wearedevelopers.com/videos/100152-keeping-applications-secure-by-evolving-oauth-2-0-and-openid-connect) - [Docker Compose: Rediscovered](https://www.wearedevelopers.com/videos/1978-docker-compose-rediscovered) - [Migrating half a million users to a new payment service provider](https://www.wearedevelopers.com/videos/730-migrating-half-a-million-users-to-a-new-payment-service-provider) - [Git for Code Reviews](https://www.wearedevelopers.com/videos/429-git-for-code-reviews) - [APIs and Architecture for scaling omnichannel payments](https://www.wearedevelopers.com/videos/90-apis-and-architecture-for-scaling-omnichannel-payments) ## Related Articles - [Highest Paying Tech Companies for Developers](https://www.wearedevelopers.com/magazine/220-highest-paying-tech-companies-for-developers) - [React Developer Salary [2023]](https://www.wearedevelopers.com/magazine/198-react-developer-salary-2023) - [Fullstack developer salary in Germany [2023]](https://www.wearedevelopers.com/magazine/197-fullstack-developer-salary-in-germany-2023) - [Fullstack Developer Salary UK](https://www.wearedevelopers.com/magazine/251-fullstack-developer-salary-uk) - [Best Paying Jobs in Technology](https://www.wearedevelopers.com/magazine/256-best-paying-jobs-in-technology) - [Why Upskilling And Reskilling is Important For Developers](https://www.wearedevelopers.com/magazine/428-why-upskilling-and-reskilling-is-important-for-developers)