Senior Software Engineer (Java, Python, TypeScript)

Founded in 2016, Katalon is the category leader in AI-augmented software testing, empowering hybrid testers—those blending manual, automation, and AI skills—to deliver exceptional digital experiences. Katalon enables software teams of any size to deliver world-class customer experiences faster, easier, and more efficiently.

Since its first launch, Katalon has experienced tremendous growth, serving more than 30,000 teams across 80+ countries, many of which are in the Fortune Global 500. Katalon has been named a G2 Leader in software testing for 11 consecutive quarters and a Great Place to Work for three consecutive years.

About the role

• Build cloud-native software using Java, Python, and TypeScript — the scalable, high-performance services and web applications that power Katalon's platform.

• You will work across backend services and modern frontends, partner with Product and other engineering teams to turn requirements into working software, and own features end to end — from design through production.

• You will also get to use AI-powered engineering tools as a normal part of how you build.

Responsibilities

• Design, develop, and maintain scalable backend services and modern web applications using Java,

• Python, and TypeScript technologies

• Work with Product Managers and cross-functional teams to translate business requirements into technical solutions

• Contribute to technical design discussions and architecture reviews, and help document the decisions that come out of them

• Write clean, maintainable, and well-tested code following software engineering best practices

• Review your teammates' code and help raise code quality, maintainability, and system reliability

• Help build highly available, secure, and observable distributed systems

• Improve application performance, scalability, and operational excellence

• Contribute to shared engineering libraries, internal frameworks, and developer tooling

• Investigate and resolve production issues while continuously improving system stability

• Use AI coding agents as a normal engineering tool: give them the right context, and review their output as carefully as your own

Job Requirements

• Solid hands-on experience with Java (typically 4+ years) building backend systems with frameworks like Quarkus, Spring Boot, or Micronaut. Kotlin experience is a plus — parts of our backend are Kotlin on the JVM, and we expect a strong Java engineer to pick it up on the job

• Experience building and operating distributed systems, with a working understanding of performance, reliability, and scalability trade-offs

• Hands-on experience with event-driven architectures and relational data modelling — Kafka or an equivalent streaming platform, PostgreSQL, caching, and search

• Working proficiency in Python or TypeScript, and willingness to work in both. Our frontends are React/TypeScript

• Experience deploying and running services with Docker and Kubernetes

• Good understanding of CI/CD, automated testing, code reviews, and version control with tools like GitHub Actions

• Strong software engineering fundamentals including SOLID principles and modular design

• Comfortable working across service boundaries and with other teams, and able to own a feature end to end

• Practical experience with AI coding tools — you already use agentic tools (Claude Code, Codex, Cursor, Copilot) for real work and have a sense of where they help and where they do not

• Strong problem-solving and communication skills

• Conversational English skills

Preferred Experience

• Working knowledge of Go alongside the JVM — some of our proxy, CLI, and containerized runtime components are written in Go

• Test automation or developer-tooling experience — browser automation and the protocols behind it (Playwright, Selenium/WebDriver, CDP, WebSocket), or building and operating containerized execution environments at scale

• Integrating LLM APIs or AI capabilities into software products — retrieval, tool calling, evaluation, cost and latency control

• Identity and authorization at enterprise scale: OIDC/Keycloak, policy engines, multi-tenant RBAC

• Experience building SaaS products for enterprise customers

• Contributions to open-source projects or technical communities

• Experience mentoring or onboarding other engineers

Job Benefit

At Katalon, we bring together self-starting, open-minded, and talented people while actively promoting a transparent and growth-enabling working environment. But don’t just take our word for it. Take a better look below!

• Total Remuneration: Satisfying your financial goals through competitive compensation and periodic performance bonuses.

• Well-being & Work-life Balance: Staying healthy through comprehensive health plans, flexible work arrangements, and generous paid leaves.

• Statutory Compliance: Labor compliance with local regulations that ensure employee security.

• Work Facilities & Accommodation: Top-notch equipment, supportive allowances, and A-class facilities.

• Diversity, Equity, Engagement, & Inclusion: Becoming part of a global team that celebrates differences, equal opportunity, and meaningful employee recognition.

• Growth & Rewards: Thriving professionally through employee enablement, a culture of trust, and rewarding performance.

Katalon is proud to be an equal-opportunity employer. We care about our people and celebrate our differences. We want to work with talented, collaborative, and innovative people. We do not discriminate in hiring or any employment decision based on race, color, religion, national origin, age, sex (including pregnancy, childbirth, or related medical conditions), marital status, ancestry, physical or mental disability, genetic information, veteran status, gender identity or expression, sexual orientation, or other characteristics protected by law.