Senior Backend Engineer (Kotlin)

👋 About Us

It's hard to build a reliable system. It's harder to make sure that what you've built is really reliable.

Synthesized is redefining software testing with agentic AI. Our platform automates test data, test cases, and test environments - empowering enterprise teams to ship faster, reduce compliance risks, and modernise QA at scale.

Our products are used by some of the world's leading organizations, such as Deutsche Bank, UBS, the European Commission, and others.

We’re an ambitious VC-backed startup, having just gone through Series A with leading global investors including IQ Capital, Seedcamp, and Deutsche Bank. We have ambitious growth plans for 2025, and we are so keen for you to join us on the journey.

🔍 The Role

Reporting to the Director of Engineering, the Senior Software Engineer is a dynamic and growth focused engineer with a passion to contribute to solving real customer problems through efficient application of technical knowledge and tools. You will have a passion for B2B data platforms, processes, innovation and results delivery. Comfortable working with stakeholders, both internally and externally, you’ll be organised, with an attention to detail and the ability to grasp new tech quickly. You will be comfortable with a data- and analytics-led approach to maximise the product growth.

📋 Key Responsibilities

• Working alongside with the Director of Engineering and the engineering team to design components of the data infrastructure


• Writing clean, high-quality, high-performance, maintainable code


• Develop and support software including applications, database integration, interfaces, and new functionality enhancements


• Working on the performance and stability of the system


• Coordinate cross-functionally to insure project meets business objectives and compliance standards


• Support test and deployment of new products and features


• Participate in code reviews

🌱 About You

• Expert knowledge of Java/Scala/Kotlin.


• Familiarity with Kotlin or willingness to learn.


• Industrial experience with AWS/GCP/Azure.


• Knowledge of common data products such as Hadoop, Spark, Airflow, PostgreSQL, S3, etc.


• Problem solving/troubleshooting skills and attention to detail.

✨ What We Offer

• 💰 Competitive salary and meaningful equity


• 🌴 33 days annual leave (including flexible national holidays)


• 🏢 Hybrid, flexible working from our London or New York office (3 days/week in our office space in Shoreditch)


• 📚 Learning & development budget for coaching, courses, and conferences


• ⚕️ Private medical, dental, and vision cover


• ✈️ Regular team socials and offsites


• 🤝 Working with a team that’s smart, ambitious, and deeply collaborative


• 🐤 Generous Family leave

🌍 Equal Opportunities

We are committed to an inclusive and diverse workplace at Synthesized. Synthesized is an equal opportunity employer. We do not discriminate based on race, ethnicity, colour, ancestry, national origin, religion, sex, sexual orientation, gender identity, age, disability, veteran status, genetic information, marital status or any other legally protected status.