Software Engineer

• Position: Senior Performance Engineer
• Working model: Remote
• Employment form: Contract of Employment up to 29 700 PLN gross or B2B up to 35 800 PLN Netto

Join our client! They are a product company that creates a platform that facilitates communication and monitoring of employees not working at desks in large companies. The application is available in both web and mobile versions. It easily enables the integration of internal company systems, customer databases, internal customer calendars, and other messengers, all available on your smartphone! The application is dedicated to companies from various industries (SaaS).

The role:

As a key member of the amazing DevOps team, you will work with modern cloud-native infrastructure and best-in-class tooling to realize these goals. If you thrive on making a measurable impact, are unafraid to explore unfamiliar technologies, and enjoy collaborating with other teams, this is the ideal role for you!

Responsibilities:

• Optimize Database Performance: Improve the performance and scalability of our databases by identifying and improving query hotspots, making schema improvements, and tuning the underlying systems
• API Performance Optimization: Enhance API performance by reducing end-to-end request latency and increasing throughput through techniques like tuning worker pools, connection pools, caching, and leveraging tools like ProxySQL
• Code-Level Insights: Analyze, read, and modify code across various services to identify and fix performance bottlenecks
• Performance Monitoring: Design and maintain dashboards that provide actionable insights into performance across our systems
• Collaborative Problem Solving: Partner with engineering teams to investigate and resolve platform-wide performance issues
• Mentorship: Share your expertise with the engineering team, teaching best practices for database performance, profiling, and scalable system design

Requirements:

• Collaborative Attitude: A team player eager to collaborate across engineering teams
• Proven Experience: 5+ years of engineering experience with a strong focus on performance and system optimization
• Database Expertise: Deep understanding of database internals and optimization techniques, particularly for MySQL and PostgreSQL
• Linux and Networking Expertise: Strong knowledge of Linux systems and networking (e.g., TCP/IP, load balancing, DNS), with the ability to troubleshoot complex issues
• Code Fluency: Solid ability to read and modify code in languages such as Python, Java, or other backend-oriented programming languages
• Kubernetes Experience: Practical experience with Kubernetes, including understanding its impact on performance and scalability
• Microservices Observability Expertise: Practical experience with tracing tools and optimizing microservices architectures
• Performance Profiling Mastery: Hands-on experience with tools like eBPF, flame graphs, and other profiling techniques inspired by Brendan Gregg’s methodologies
• Cloud Platforms: Familiarity with cloud services (AWS, GCP) and their database offerings (e.g., RDS, managed PostgreSQL/ClickHouse)

Nice to have:

• ​​Global Network Optimization: Experience optimizing global network performance using cloud tooling to leverage edge caching, early TLS termination, HTTP protocol optimization (e.g. HTTP/2/3 or QUIC), etc.
• Infrastructure-as-Code Expertise: Familiarity with tools like Terraform for automating and managing infrastructure deployments
• Open Source Contributions: Contributions to open-source projects, especially in the database, performance, or observability domains

The offer:

• Competitive salary
• Phone & Home Internet costs reimbursement up to 80 PLN/month
• Private health care package with Luxmed
• Multisport Benefit card
• Creative Allowance – paid as 1000 PLN gross/month
• Home office set-up reimbursement of up to 1000 PLN
• Personal Learning & Development Budget of 1500 USD/year
• Sabbatical Program – 1 month paid leave at 3, 5, 10 year tenure
• 26 days of annual leave/year
• 2 Mental Health days off per year
• Laptop for work purposes
• Hybrid working model
• Oh and don’t forget about Stock options!