---
title: 'Senior Full Stack Engineer (Java/React) at Aperia'
canonical: 'https://feeny.ai/job/senior-full-stack-engineer-java-react-aperia-vietnam-4awk5gwzgs65'
type: 'job'
last_seen: '2026-09-11'
---

# Senior Full Stack Engineer (Java/React) at Aperia

- **Company:** Aperia
- **Location:** Vietnam
- **Work type:** remote
- **Posted:** 2026-09-11
- **Last confirmed live:** 2026-09-11
- **Apply:** https://job-boards.greenhouse.io/aperiasolutions/jobs/5235312007

## Job description

Summary

Join Aperia Solutions, a fast-growing FinTech and managed consultancy building B2B accounts payable and payments platforms. You’ll join a mid-size, distributed team working across the full stack — from Terraform infrastructure to Spring Boot services to React interfaces and database migrations. Aperia serves banks, processors, payment facilitators, merchant service providers, ISOs, and government entities. This role offers technical ownership, a collaborative culture, and opportunities to shape product and architecture.

Job Description

We’re seeking a Senior Full Stack Developer (Java, React) 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 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): 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 (need to live in VN)

## Benefits

- Competitive Salary Package – Enjoy a rewarding income from day one.
- Security from the Start – Full salary during probation plus complete social insurance coverage.
- Premium Health Insurance – Comprehensive protection for you and your loved one (spouse/children).
- Family-Friendly Benefits – Monthly childcare support to make parenting easier.
- Generous Leave Policies – 15 days annual leave, 6 weeks paternity leave, and 10 days bereavement leave.
- Active Lifestyle – Join our vibrant clubs: Football, Billiards, Badminton, and E-sports...

## About Aperia

## Company Overview
- **One-liner**: Aperia is a privately held fintech and managed consultancy firm that builds SaaS platforms and delivers technology services to financial institutions, payment companies, and government agencies.
- **Entity Type**: Private (Bootstrapped — 100% privately owned, purpose-driven)
- **Headquarters**: Dallas, Texas, United States
- **Founded**: 1999 (or 2001 per LinkedIn; the company website states "over 25 years" of leadership)
- **Founders**: Not publicly disclosed

## Core Business
- **Primary Industry**: Fintech, Payments, Government/Defense Technology, IT Services
- **Target Customers**: Banks, processors, payment facilitators, merchant service providers, independent sales organizations, and government/defense entities (B2B, Enterprise)
- **Mission Statement**: Not explicitly stated as a single quote, but the company describes itself as "Built on Purpose, Driven by Impact" and focuses on "innovation, usability, and security" to help organizations "operate smarter, faster, and with confidence."

## Products & Services
- **Compliance Platform**: Streamlines education, assessment, tracking, and regulatory reporting for regulated environments.
- **Risk Management / Fraud Detection**: Real-time monitoring, intelligent analytics, and automated fraud detection; analyzes hundreds of millions of transactions.
- **Customer Onboarding**: Digitizes and streamlines onboarding with automated workflows and accelerated activation.
- **Analytics & Business Intelligence**: Advanced analytics and flexible reporting to turn data into actionable insight.
- **Compensation Management**: Automates complex partner and agent compensation with configurable models and accurate reporting.
- **Customer Intelligence Platform (CIP)**: Unifies case management, service workflows, and performance metrics in a configurable interface.
- **Software Development as a Service (SDaaS)**: Full-stack engineering for platform modernization and custom development.
- **Managed Resources**: On-demand access to expert Agile teams that integrate with client organizations.
- **Consultancy**: Close partnership to solve complex, data-driven problems and refine processes.
- **Government, Defense & Security**: Cloud-native solutions for data unification, situational awareness, and mission-critical operations.

## Market Standing
- **Valuation**: Not disclosed (privately held)
- **Key Metric**: Annual Revenue estimated at **$56.2M** (per LinkedIn data); serves **over 6 million users** across hundreds of clients
- **Notable Investors/Partners**: 100% privately owned; no external investors listed. Clients include banks, payment processors, and government agencies.
- **Growth Signals**: Global workforce of **400+ employees** (LinkedIn reports 187 but the company website states 400+; the discrepancy may reflect total headcount including contractors/global offices). Offices in Dallas, Washington DC, and Vietnam. Senior management average tenure of **18 years**.

## Competitive Advantages
- **Deep Fintech & Payments Expertise**: Over 25 years of experience solving complex data and reconciliation challenges for the payments industry.
- **Long-Term Client Relationships**: Emphasizes partnership over vendor status; high client retention.
- **Regulatory & Security Focus**: Deep experience in highly regulated industries (payments, banking, government).
- **Stable Leadership**: Senior management team with average tenure of 18 years ensures strategic continuity.
- **Global Delivery Model**: Offices in the US and Vietnam enable cost-effective, round-the-clock development and support.

## Strategic Focus
- Continued expansion of SaaS platforms for compliance, risk, and customer intelligence
- Deepening capabilities in government, defense, and security sectors
- Scaling managed resources and SDaaS offerings
- Maintaining a 100% privately owned, purpose-driven model for long-term growth

## Why Work Here
- **Culture**: Describes itself as "a family" where "no single role is more important than another." Core values: Innovation, Usability, Security, Partnership, Transparency, Teamwork.
- **Work Model**: Hybrid working model in place (as of 2022). "We value your individual contribution and trust your results, regardless of your role."
- **Global Team**: Fast-paced, global organization with offices in Dallas, Washington DC, and Vietnam.
- **Career Growth**: "A career at Aperia promises a great challenge, culture, and opportunities to forge your own path." Open roles include Product Manager, Project Manager, Senior Software Developer, and more.
- **Stability**: Privately owned with no outside investors, allowing long-term strategic focus.
- **Diversity & Inclusion**: Equal Opportunity/M/F/Vet/LGBT/Disabled Employer.

## Sources
1. [aperia.com](https://www.aperia.com/)
2. [aperia.com/about](https://www.aperia.com/about)
3. [aperia.com/services](https://www.aperia.com/services)
4. [Greenhouse Careers Page](https://job-boards.greenhouse.io/aperiasolutions)
5. [LinkedIn Company Page](https://www.linkedin.com/company/aperia-solutions-inc.)

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