Lead / Senior Product & Platform Engineer

We are looking for a Senior / Lead Product & Platform Engineer to join a product development team working on a core platform focused on product enhancement, performance, reusable capabilities and complex engineering.

You will work closely with an international team, contribute to the development of the platform and mentor engineers joining the project.

In Short

🌎 100% REMOTELY or from one of our 2 offices

💰 170 - 200 PLN/h + VAT

☑️ B2B contract

Your Daily Missions

• Developing and enhancing a core product platform.

• Working with Kotlin and Java on GCP.

• Building REST APIs, microservices and asynchronous processing solutions.

• Working with PostgreSQL, Redis and Firestore.

• Developing CI/CD and deployment automation using Docker.

• Ensuring proper testing, monitoring, logging and performance.

• Troubleshooting production issues.

• Building reusable capabilities and solutions.

• Using AI coding tools to accelerate development while verifying generated code.

• Mentoring other engineers and communicating technical decisions clearly.

The Essentials We’re Seeking

• Minimum 5 years of commercial experience as a Java Developer.

• Strong commercial experience with Kotlin and Java.

• Strong experience with GCP, including Cloud Run, Compute Engine, Cloud Storage, IAM and networking.

• Strong written and spoken English (C1), with experience working in an international environment.

• Experience with REST APIs, microservices and distributed systems.

• Experience with PostgreSQL, Redis and Firestore.

• Experience with CI/CD, Docker and automated deployments.

• Practical experience delivering AI-agentic / LLM features.

• Understanding of retrieval grounding, moderation and hallucination management.

• Ability to quickly work in an unfamiliar Kotlin/GCP codebase using AI coding tools.

• Strong engineering judgement and a reusability mindset.

• Ability to work independently and mentor other engineers.

Nice-to-haves

• Terraform, Pub/Sub, Vertex AI or OpenAI APIs.

• Experience with high availability, fault tolerance, high-throughput / low-latency systems, concurrency or caching.

• Experience with OAuth / OIDC / JWT, secrets management or encryption.

• Experience with voice or conversational AI.

• Experience in collections, contact-centre or financial services.

Reasons Why You Would Enjoy Working With Us

• We work in the latest technologies and with international clients, and our projects are polished from < to /> - learn about some of the projects we have completed.

• We organize TechTalks, meet-ups and create guilds where we exchange knowledge - you can learn a lot from your teammates.

• We have a close-knit team and we make sure to have regular integrations - we often go out to celebrate together.

• You can work remotely or choose to work from our offices in Wroclaw or Bielsko-Biala. However, we count on your openness to occasionally visit the office for team meetings or client visits, or possible occasional trips to the client's headquarters.

• You can adjust your working hours to suit your needs, starting your day between 7:00 and 10:00 am.

• You can work with great specialists in their fields who also have a sense of humor and other after-hours hobbies. It is the people who create the unique atmosphere and relaxed atmosphere at CSHARK.

• We have a flat structure - we are not a corporation and don't want to be one 🙃.

• We offer bonuses for employee referrals (from 3000 PLN to 7000 PLN).

• We organize remote English classes and provide access to the company library. You can also become an author/author of articles published on our technical blog - .