Senior Full Stack Engineer – Java/React

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Aperia

WebsiteLinkedInAll Job Openings

201 - 500 employees

Founded 2001

💳 Fintech

🏛️ Government

☁️ SaaS

Fintech • Government • SaaS

Aperia is a technology and services company that delivers cloud-native SaaS platforms, professional services, and managed engineering teams for complex, regulated environments. With more than 25 years of experience, Aperia focuses on fintech and payments, government and defense solutions, and logistics by providing intelligence-driven platforms for risk, compliance, onboarding, situational awareness, and operational resilience. The company also offers Software Development as a Service (SDaaS), managed resources, and customer intelligence/case management products to help organizations consolidate operations, improve decision-making, and scale securely.

📋 Description

• 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 REST APIs, integrate messaging queues, and implement asynchronous/event-driven patterns. • Manage database schema design and migrations for MySQL/PostgreSQL; optimize queries and performance. • Participate in infrastructure-as-code efforts and deploy to multi-environment AWS. • Secure APIs using OAuth2/Spring Security, JWT, and policy-based authorization. • Maintain, upgrade, and refactor existing codebases. • Write and maintain unit and integration tests; support CI/CD and observability. • Collaborate with product, QA, and distributed engineering teams; participate in Agile sprints and code reviews. • Ensure code follows best practices, design patterns, and security standards. • Mentor peers, investigate and resolve production issues, and support continual improvement. • 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. • Perform unit and cross testing and document results. • Conduct technical research and internal training.

🎯 Requirements

• Minimum 6 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), including schema design, migrations, and performance tuning. • Experience with messaging systems such as RabbitMQ, AWS SQS/SNS, or similar, and event-driven patterns. • Practical AWS experience with Lambda, ECS, S3, RDS, and 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. • Bachelor’s Degree in Computer Science, Information Systems, or related field, or equivalent experience. • Familiarity with WCF or .NET is a plus but not required. • Fintech/payments domain knowledge, Terraform or equivalent IaC, reactive programming, observability, distributed applications, Agile/Scrum, distributed teams, and strong communication skills are desirable.

🏖️ Benefits

• Competitive Salary Package – Enjoy a rewarding income from day one. • Full salary during probation plus complete social insurance coverage. • Comprehensive health insurance for you and your loved one (spouse/children). • Monthly childcare support. • 15 days annual leave. • 6 weeks paternity leave. • 10 days bereavement leave. • Football, Billiards, Badminton, and E-sports clubs.