Senior Full Stack Engineer — Backend Focus

Unisys; Rockville (MD); Hybrid; USD 150,000 - 190,000; Full time

Job summary

Unisys is seeking a Senior Full Stack Engineer to own backend-focused development of production applications, APIs, and cloud services. The role combines investigation and durable fixes, with ownership from issue to resolution.

You’ll help address regulatory operations and ensure accurate, efficient market protections while delivering high-quality backend and frontend features. Hybrid work in Rockville, MD or Tysons, VA, with 3 days onsite per week, collaborating with product, data, Compliance,

Qualifications

• 10+ years of software engineering experience across full stack.
• Expert in Java, Spring Boot, and API development.
• Backend-first with ability to work across the full stack.
• Frontend experience with Angular and/or React.
• Strong SQL skills and database performance tuning (RDS).
• AWS experience including Lambda and RDS.
• Experience in performance testing, automation, and unit testing.
• Ability to understand and tune AI-generated code for quality.
• Excellent communication and collaboration across teams.

Responsibilities

• Design, build, and maintain backend services and APIs using Java and Spring Boot.
• Investigate production issues and implement mitigations and durable fixes.
• Build REST APIs for reliability and scalability; optimize cloud-based apps on AWS.
• Analyze database performance and optimize queries.
• Develop frontend features using Angular and/or React.
• Improve unit tests, automated tests, and performance testing practices.
• Review code, manage risks, and simplify infrastructure.
• Collaborate with product, data, compliance, and engineering teams.

Skills

Java

Spring Boot

API development

Angular

React

SQL & Query optimization

AWS

Lambda

RDS

Performance testing

AI-assisted code tuning

Unit testing

Tools

PostgreSQL

MongoDB

CI/CD

Docker

GitLab CI/CD

Job description

Location: Rockville, MD or Tysons, VA

Work arrangement: Hybrid — 3 days onsite per week

Must have’s:

• 10 years of experience
• Java, Springboot, API
• Frontend: Angular, React
• DB – RDS, Query optimization, tuning
• AWS, Lambda
• Experience in performance testing, automation, unit testing
• AI : must have understanding the code, to tune and optimize the code.

About the role

We’re looking for an experienced Senior Full Stack Engineer who enjoys solving complex problems and taking ownership from investigation through resolution. This is a backend-focused role building and improving production applications, APIs, and cloud services.

You’ll help address urgent issues with practical short-term solutions while also identifying and delivering durable fixes. Your work will support important regulatory operations and contribute to protecting investors and maintaining fair, efficient markets.

What you’ll do

• Design, build, and maintain backend services and APIs using Java and Spring Boot.
• Investigate production and performance issues, implement appropriate immediate mitigations, and follow through with permanent solutions.
• Build and optimize REST APIs and services for reliability, performance, and scalability.
• Work with AWS, including Lambda and RDS, to develop and operate cloud-based applications.
• Analyze database performance, optimize queries, and contribute to database tuning.
• Build and maintain frontend features using Angular and/or React.
• Develop and improve unit tests, automated tests, and performance testing practices.
• Use AI-assisted development tools thoughtfully: understand generated code, assess its quality, and tune or optimize it as needed.
• Identify technical risks, simplify code and infrastructure, and improve maintainability.
• Collaborate with product, data, compliance, and engineering teams; participate in code reviews and share knowledge.

What you’ll bring

• 10+ years of professional software engineering experience, including full stack development.
• Strong hands‑on experience with Java, Spring Boot, and API development.
• A backend-first engineering background and the ability to work across the full stack.
• Experience with Angular and/or React.
• Experience with AWS, especially Lambda and RDS.
• Strong SQL skills, including query optimization and database performance tuning.
• Hands‑on experience with performance testing, test automation, and unit testing.
• A problem‑solving mindset: able to diagnose issues, make sound tradeoffs, and balance immediate fixes with long‑term solutions.
• The ability to understand, evaluate, and improve code produced with AI-assisted tools.
• Strong communication skills and a track record of taking work through to completion.

Nice to have

• Experience with PostgreSQL, MongoDB, Python, or Spark SQL.
• Experience with CI/CD, Docker, infrastructure as code, or GitLab CI/CD.
• Familiarity with AWS services such as EC2, ECS, Fargate, S3, or EMR.
• AWS certification, such as Solutions Architect or Developer Associate.