Senior Software Engineer

Synexus is seeking a Senior Software Engineer to join our data‑driven ad tech team located in London, England.

$/yr - $/yr

At Synexus, we help advertisers rethink how they show up in the news ecosystem. Our new brand leverages topic‑based analysis to enable premium journalism in media plans, driving better reach, performance, and efficiency.

• Enhance and maintain our open web crawling system, solving edge cases such as paywalled or obfuscated content to ensure reliable and comprehensive data collection.
• Build and optimize internal tools and infrastructure that empower data scientists and analysts to access and explore large‑scale data with speed and minimal friction.
• Support our transition from batch to real‑time data processing, including the design and implementation of queue‑based pipelines and event‑driven architectures.
• Develop and maintain data integrations with key demand‑side platform (DSP) partners, ensuring reliable and secure data delivery at scale.
• Work across the stack as needed, whether improving backend performance, helping with API design, or optimizing data workflows.
• Contribute to core engineering practices such as code reviews, testing, observability, and CI/CD to help grow a robust, maintainable codebase.
• Mentor junior engineers, shepherd projects from ideation to completion, and constantly improve processes.

• 7+ years of experience building and maintaining production systems.
• Successful experience as a senior/lead engineer with demonstrated mentoring, project management, and technical leadership skills.
• Excellent Python skills with 5+ years of clean, maintainable, well‑tested code.
• Deep experience with AWS services (EC2, S3, Lambda, Cloud Watch, ECS/Fargate) focused on building reliable, scalable infrastructure.
• Strong understanding of relational databases, particularly Postgre
  
  SQL, and experience writing efficient queries and managing schema changes.
• Deep experience with data pipelines or event‑driven architectures, including message queue tools such as SQS, Kafka, or similar.
• Excellent debugging and problem‑solving skills, navigating ambiguity and prioritizing effectively.
• Deep experience with CI/CD pipelines, version control such as Git, ensuring smooth development workflows.
• Excellent communication and collaboration abilities within a small, cross‑functional team.
• Remote or virtual team experience and ability to work across time zones.

• Experience building or working with web crawlers at scale.
• Exposure to data engineering or analytics workflows.
• Interest or experience with ad tech ecosystems or external partner integrations.
• Experience using agile project‑management tools (Jira, Asana).
• Bachelor’s degree in Computer Science, Engineering, or related field.
• Comfortable with on‑call rotations and rapid response.

• Competitive salary (see above).
• Health, dental, and vision benefits (US‑based team only).
• Flexible working hours and remote options;
  Full‑time, 1.0 FTE (37.5 hrs per week). Work overlapping US Central hours required.
• Professional development opportunities.
• Diverse and inclusive workplace committed to equality and belonging.

London, England, United Kingdom.