- Design and implement core backend services for real-time bidding, optimization, and ad delivery workflows
- Build custom bidding agents for real-time bid decisioning
- Develop high-load, low-latency components supporting real-time auction and delivery mechanics
- Implement proprietary pacing, bid-shading, and optimization logic to improve campaign efficiency
- Design and integrate forecasting capabilities for impressions, reach, outcomes estimation, and campaign planning
- Work with OpenRTB, JSON, protobuf, and other ad-tech protocols and data formats
- Integrate with data and metrics pipelines to support real-time optimization and reporting
- Implement observability, monitoring, and troubleshooting capabilities (LGTM/ELK stack)
- Collaborate with product, engineering, data, and ad operations stakeholders to deliver scalable performance advertising capabilities
- 5+ years of relevant experience as a Backend Engineer in commercial projects
- Strong backend engineering experience with C++ or Golang
- Experience designing and building high-load, low-latency distributed systems
- Hands-on experience with JSON-based integrations, protobuf, or similar protocols
- Experience with low-latency data stores and caching technologies (Aerospike, Redis, ElastiCache, etc.)
- Experience with PostgreSQL or similar relational databases
- Proven track record of building production-grade services with strong reliability, scalability, and observability requirements
- Ability to work independently, reason through complex system trade-offs, and contribute to architecture decisions
- Upper-Intermediate English level
WILL BE A PLUS
- Understanding of real-time bidding systems, auction mechanics, and ad-tech domain
- Knowledge of pacing, bid optimization, forecasting, or performance advertising delivery mechanics
- Experience working on DSP, SSP, ad exchange, ad server, or performance marketing platforms
- Familiarity with LGTM/ELK or similar observability stacks
PERSONAL PROFILE
- Analytical mindset with strong problem-solving skills
- Ability to work in fast-paced environments
- Excellent communication skills for cross-team collaboration
- Self-motivated and proactive approach to work
- Strong attention to detail and commitment to quality
Are you ready to take on a high-impact role in building cutting-edge advertising technology? We are looking for a Principal/Senior Backend Engineer to join our team and design a high-load, low-latency real-time bidding platform. This position is based in Warsaw, Poland, with the flexibility to work remotely.
At Sigma Software , we deliver innovative, scalable solutions that empower industries and drive measurable results. You will work alongside talented professionals in a culture that values e