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Senior Backend Engineer (C#)
About On The Spot
About the team
Cycode is an AI‑Native Application Security Platform that secures every stage of modern software delivery. Cycode unifies code and pipeline scanning, secrets detection, supply chain security, IaC analysis, and runtime insights into one end‑to‑end solution.
The platform uses AI to connect signals across the entire development lifecycle, helping teams focus on the highest-impact risks and automate remediation. By integrating source control, CI/CD tools, cloud environments, and deployment pipelines, Cycode gives organizations full visibility and control over how their software is built and delivered.
Take a look inside Cycode’s Warsaw team 👉 in our blog post.
About the role
We’re looking for a Senior Back-End Engineer to join our Scanners Infrastructure Team.
In this role, you’ll focus on building and evolving scalable, high-performance services in C#/.NET Core that are critical to our platform’s growth. You will own complex backend components, influence architectural decisions, and ensure our services are both resilient and efficient at scale.
While this position is primarily backend-focused, from time to time you’ll collaborate with the team on areas that touch infrastructure to ensure your services perform well in production.
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Responsibilities
- Design, develop, and maintain scalable backend services in C#/.NET Core
- Take ownership of service performance and reliability, including identifying and resolving complex bottlenecks
- Contribute to system design and architectural discussions to shape the future of our platform
- Collaborate with teammates on production issues, monitoring and alerting improvements, and long-term scalability strategies
- Occasionally assist with DevOps tasks, such as tweaking the scheduler
- Mentor peers and contribute to best practices in backend engineering
Requirements
- 5+ years of professional experience with C#/.NET Core in production environments
- Strong background in microservices architecture and distributed systems
- Proven ability to optimize performance and design for scalability
- Familiarity with Kubernetes (experience with KEDA a plus)
- Experience with databases (MongoDB, PostgreSQL, GraphDBs) and messaging systems (Kafka)
- Knowledge of CI/CD pipelines, containers, and general cloud environments
- Strong communication skills and ability to provide technical leadership within a team
Benefits
- Work in a highly professional team. Informal and friendly atmosphere in the team
- Paid vacation — 20 business days per year, 100% sick leave payment
- Equipment provision
- Partially compensated educational costs (for courses, certifications, professional events, etc.)
- Legal and Accounting support in Poland
- Ability to work from our comfortable office in Warsaw at Prosta 51
- 5 sick days per year
- Medical insurance (after the end of the probationary period)
- Flexible working hours – we care about you (!) and your output
- English and Polish classes 2 times a week (online)
- Bright and memorable corporate life: corporate parties, gifts to employees on significant dates
Join us
To be considered for this position, you must have Polish citizenship, a D-type work visa, or a residence permit. Thank you!
Contribute to our growth
Know someone perfect for this role? Let us know about them. We have a referral program to recognize your support.
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