Job Description We're seeking a Senior Full Stack Developer comfortable across backend, frontend, and cloud/infrastructure. You'll design, build, and maintain secure, high-performance payment systems and integrations. The ideal candidate has strong Java/Spring Boot experience, React front-end skills, relational database expertise (MySQL/Postgres), messaging/event-driven architecture experience, and practical AWS and infrastructure-as-code exposure. Testing discipline, API security (OAuth2/JWT), and familiarity with distributed tracing are important.
Core Responsibilities
- Design, create, maintain, and optimize applications using Spring Boot (MVC and WebFlux), React, and the Microsoft/Java tech stack where applicable.
- Translate business requirements into functional, secure, and scalable solutions.
- Build and maintain APIs (REST), integrate messaging queues, and implement async/event-driven patterns.
- Manage DB schema design and migrations for MySQL/PostgreSQL; optimize queries and performance.
- Participate in infrastructure-as-code efforts (Terraform or equivalent) and deploy to multi-environment AWS (ECS, Lambda, RDS, S3, SSM).
- Secure APIs using OAuth2/Spring Security with JWT and policy-based authorization.
- Maintain, upgrade, and refactor existing codebases to improve efficiency and performance.
- Write and maintain unit and integration tests (JUnit, Mockito), and support CI/CD and observability (OpenTelemetry/distributed tracing).
- Collaborate with product, QA, and distributed engineering teams; participate in Agile sprints and code reviews.
- Ensure error-free code that follows best practices, design patterns, and security standards.
- Mentor peers, investigate and resolve production issues, and support continual improvement.
Functional Responsibilities
- Work with Business Analysts and US-based stakeholders to clarify requirements.
- Propose technical approaches and detailed implementation plans.
- Implement daily tasks, investigate issues, and support team members to deliver high-quality work.
- Perform unit and cross testing; document results.
- Conduct technical research and internal training.
- Other duties as assigned.
Required Technical Skills & Experience
- Minimum 4 years hands-on experience with Java and Spring Boot (MVC and/or WebFlux/Reactor).
- Strong experience with React, REST APIs, HTML5, CSS3, and Bootstrap-based responsive UI.
- Solid experience with relational databases (MySQL, PostgreSQL): schema design, migrations, and performance tuning.
- Experience with messaging systems (RabbitMQ, AWS SQS/SNS, or similar) and event-driven patterns.
- Practical AWS experience (Lambda, ECS, S3, RDS, SSM).
- Knowledge of OAuth2/Spring Security, JWT, and policy-based authorization.
- Testing discipline with JUnit, Mockito, or similar frameworks.
- Strong understanding of performance, security, best practices, and design patterns.
- Experience with Web Services; familiarity with WCF or .NET is a plus but not required.
Desirable Experience (will separate you from the rest)
- Fintech/payments domain knowledge (ACH, NACHA, reconciliation, FBO models).
- Terraform or equivalent IaC and multi-environment infrastructure management.
- Deep experience with reactive programming (Mono/Flux).
- Observability experience: OpenTelemetry, distributed tracing, metrics, and logging.
- Hands-on experience with multi-tier/layer distributed applications.
- Comfortable working in Agile/Scrum environments and with distributed teams.
- Strong communication skills.
Education or Certifications
- Bachelor's Degree in Computer Science, Information Systems, or related field (or equivalent experience).
Job Type & Schedule
- Full time
- Monday to Friday
- Remote
Benefits
- Health insurance; Health savings account
- Dental insurance; Vision insurance
- 401(k) matching; Life insurance
- Paid time off; Parental leave; Disability insurance
- Childcare assistance; Education reimbursement
- Fitness membership; Volunteer time off
