Are you ready to take on a high-impact role in building cutting-edge advertising technology? We are looking for aLead/Principal Go Developer to join our team and design a high-load, low-latency real-time bidding platform.

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 expertise, collaboration, and continuous growth.

Why join us? We offer competitive benefits, versátil working arrangements, and opportunities to work on challenging projects that push the boundaries of technology.

CUSTOMER

Our customer is a globally recognized technology-driven company operating in the digital advertising space. They specialize in delivering scalable, high-performance solutions that empower advertisers to optimize campaigns in real time. With a strong culture of innovation and excellence, they are committed to building platforms that shape the future of programmatic advertising.

PROJECT The project is a strategic self-service advertising solution designed to make streaming inventory more accessible, measurable, and performance-driven for advertisers of all sizes. It includes a real-time bidding and optimization platform capable of handling high-load, low-latency auction mechanics. The system integrates forecasting.

Design and implement core Back-End 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

Qualifications

At least 7 years of relevant experience as a Back-End Developer in commercial projects

Strong production experience with 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 such as Aerospike, Redis, ElastiCache or similar

Experience with PostgreSQL or similar relational databases

Experience 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

At least an Upper-Intermediate level of English

WILL BE A PLUS

Understanding of real-time bidding systems, auction mechanics and AdTech domain

Understanding of pacing, bid optimization, forecasting or performance advertising delivery mechanics

Experience working on DSP, SSP, Ad Exchange, ad server or performance marketing platforms

Experience with integration of LGTM/ELK or similar observability stacks

Additional Information 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

📌 Lead/Principal Go Developer (AdTech) (Madrid)
🏢 Sigma Software
📍 Madrid