Backend Engineer (Kotlin)

We’re looking for a Backend Engineer (Kotlin) to evolve and scale the control-plane of our SaaS platform. With customer adoption climbing, we need extra fire-power to extend core services and keep pace with new feature demand. Reporting to the Backend Team Lead, you’ll build services that power everything the UI depends on. You’ll work closely with Product Management on feature design and pair with frontend engineers. The role offers plenty of scope to shape architecture, own features end-to-end, and putting your stamp on architectural decisions that drive the product forward.

Core responsibilities

  • Design, implement and maintain Spring Boot services in Kotlin, with a focus on clean architecture and resilience.
  • Model data in PostgreSQL, own schema migrations with Liquibase, and access data through jOOQ.
  • Treat the OpenAPI contract as the single source of truth. Co-author, review and enforce it across teams, automate server/client generation.
  • Practice shift-left testing: write unit and integration tests alongside your code.
  • Practice documentation as code: write documentation for new features alongside your code.
  • Contribute to and refine our CI/CD workflow on GitHub Actions.
  • Collaborate daily with the Product Manager, Team Lead and frontend engineers to de-risk stories, clarify edge cases and deliver iterative value.
  • Participate in code reviews and architecture discussions, sharing knowledge and mentoring when opportunities arise.
  • Help monitor production with logs/metrics, triaging incidents and feeding learnings back into design and tests.

About you

  • Professional experience building Kotlin (or Java) services on Spring Boot in production.
  • Solid knowledge of PostgreSQL schema design, indexing, SQL queries and migration tools (Liquibase or similar) and fluency with jOOQ or similar tools for type-safe data access.
  • Comfortable writing tests (JUnit, Testcontainers, MockMVC) and using code-coverage metrics to guide improvements.
  • Hands-on with OpenAPI / Protobuf and code-generation workflows; you value strongly typed contracts between services and UI.
  • Familiar with GitHub and GitHub Actions (or similar) for CI/CD and environment automation.
  • Understanding of cloud-native patterns (containers, REST/gRPC APIs, observability).
  • Good grasp of distributed-systems pitfalls, which is relevant to our remote-agent / control-plane topology.
  • Practical experience with performance profiling and JVM tuning is a plus.
  • Understanding basics of front end development (full stack skills) is a strong plus.
  • Clear communicator who enjoys whiteboarding with product and frontend peers and can explain trade-offs to both technical and non-technical stakeholders.
  • Continuous learner who values clean code and incremental delivery.

About us

High-quality data access and provisioning shouldn't be daunting and time-consuming. Synthesized automates this process — we solve the problem of replacing sensitive production data from non-production environments with right-sized, production-like data. Since 2018 we have pioneered the generation of production-like data for machine learning and application development across all structured data formats within one platform.

Our products are used by some of the world's leading organizations, such as Deutsche Bank, UBS, the European Commission, and others. We continue to be a part of various roundtables on AI regulations and ethics in the UK and Europe. Most recently, Synthesized contributed to the AI Roundtable with the Secretary of State for Science, Innovation, and Technology who hosted senior AI leaders at Downing Street.

We’re an ambitious VC-backed startup, with leading global investors including IQ Capital, Seedcamp, and Deutsche Bank. We have ambitious growth plans for 2024, and would love you to join us on the journey.

What We Offer

  • Wonderful office in the heart of Shoreditch, hybrid 3-days 🏢
  • Generous cash compensation and share options 💰
  • Flexible work hours ⏰
  • Personal development budget (coaching, courses, events) 📚
  • Comprehensive health, vision, and dental plan coverage ⚕️
  • 33 days paid leave per year including flexible national holidays 🌴
  • Snacks and drinks provided weekly 🍏
  • Working alongside great people in a friendly and respectful environment 🙋🏾‍♀️
  • Company events, regular team socials, and international trips ✈️

🌎 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, color, ancestry, national origin, religion, sex, sexual orientation, gender identity, age, disability, veteran status, genetic information, marital status or any other legally protected status.

Synthesized Vision

A world where unnecessary friction around information is removed
Our core belief is that progress is impossible without information, and information can and should be accessible.

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