Java Developer (AI-first mindset)

Timestamp; United States; On-site; USD 90,000 - 130,000; Full time

Benefits offered by this job

Health insurance

Flexibility in organizational routine

Training and certifications

Employee Support Program (in 5 areas,

Job summary

Timestamp Group is seeking a Backend Developer in the United States to design, build, and maintain backend services using Java and Quarkus. AI-first workflows will be embedded in daily tasks, including coding, testing, and reviews with tools like GitLab Duo and Claude Code.

The role involves collaborating with engineers, QA and product to deliver reliable, well-tested software at scale, while maintaining high standards for code quality and performance.

Qualifications

• 4+ years of hands-on backend development experience.
• Experience with Java; Quarkus is a plus.
• Practical experience with AI-assisted development tools (GitLab Duo, Claude Code, GitHub Copilot) daily.
• Experience designing and building APIs and Java-based microservices that scale in production.
• Experience writing automated unit and integration tests for backend systems.
• Ability to understand feature context before designing technical solutions.
• Willingness to explore and responsibly integrate new AI tools.

Responsibilities

• Design, build and maintain backend services and APIs using Java and Quarkus.
• Incorporate AI tools like GitLab Duo and Claude Code to speed coding, testing, and reviews.
• Tackle day-to-day backend tasks including features, bug fixes, and refactors with AI acceleration.
• Write automated tests for backend services to improve coverage.
• Participate in AI-assisted and peer code reviews to uphold engineering standards.
• Troubleshoot CI/CD pipelines and speed up root-cause analysis with AI tools.
• Collaborate with backend engineers, QA and product to deliver reliable software.

Skills

Backend development

Java

Quarkus

AI-assisted development

Unit & integration testing

English communication

Tools

GitLab Duo

Claude Code

GitHub Copilot

CI/CD pipelines

Job description

Timestamp Groupaggregates several leading Portuguese IT solutions and services companies around the concepts of excellence and knowledge sharing. We are committed to technological leadership, based on the quality of our service and technological solutions, supported by continuous training and certification.

We are looking for a Backend Developer with experience in Java, Quarkus, and AI development to join our team. AI will be a core part of your daily workflow, using tools such as GitLab Duo and Claude Code to accelerate coding, testing, and code reviews. You will help the team deliver backend tasks faster and with higher quality, bringing an AI-first mindset to how we build, test, and release backend services.

You will…

• Design, build and maintain backend services and APIs using Java and Quarkus.
• Use AI tools such as GitLab Duo and Claude Code as part of your daily workflow to accelerate coding, testing, debugging and code review.
• Solve day-to-day backend team tasks – features, bug fixes, refactors, integrations – leveraging AI to move faster without compromising quality.
• Write automated tests (unit and integration) for backend services, using AI to speed up test creation and improve coverage.
• Take part in code reviews – both AI-assisted and with teammates – ensuring code quality and adherence to our engineering standards.
• Troubleshoot and resolve issues in CI/CD pipelines, using GitLab Duo to speed up root‑cause analysis.
• Collaborate closely with other backend engineers, QA and product to deliver reliable, well‑tested software.

Experience & Skills Required

• 4+ years of hands‑on experience in backend development
• Experience with Java. (Quarkus is a plus)
• Practical experience using AI-assisted development tools such as GitHub Copilot, GitLab Duo, Claude Code, or similar as part of a daily engineering workflow.
• Experience designing and building APIs and Java-based microservices that run reliably at scale in production.
• Experience writing automated unit and integration tests for backend systems.
• Ability to understand the functional and business context of a feature before designing the technical solution.
• Curiosity and willingness to experiment with new AI tools and integrate them responsibly into day-to-day development practices.
• Comfortable working in a fast‑moving environment where AI‑assisted development practices are still evolving.
• Strong attention to detail, critical thinking, and problem‑solving skills.
• Good verbal and written communication skills in English.
• Collaborative, adaptable, and able to manage multiple priorities effectively

Nice to Have

• Experience with LLM‑based integrations, Retrieval‑Augmented Generation (RAG), or agent orchestration workflows.
• Familiarity with MCP (Model Context Protocol) or similar tool/context integrations that connect AI assistants to internal systems.
• Exposure to AI‑native development practices beyond code completion, such as spec‑driven development frameworks, custom prompt or skill libraries, and automation workflows

Mindset

• Pragmatic – knows when to move fast and when to invest in more solid foundations.
• Structured thinker – reasons about a problem before diving into code.
• Autonomous – takes ownership of tasks and knows when to ask for help.
• AI‑enabled – uses modern AI tools to boost speed and quality, without losing engineering judgment.
• Collaborative – works well with other engineers, QA and product, and enjoys building with context

Employee Benefits

• Health insurance
• Flexibility in organizational routine
• Training and certifications
• Employee Support Program (in 5 areas, including psychology)
• Birthday and seniority gifts
• Monthly Happy Hour
• Benefits portal with attractive offers