Sr. Full Stack Software Engineer - UserGems

UserGems is the AI Command Center for outbound and ABM. We capture account & contact data and buying signals to help companies know who to target, when, and why—taking next actions via humans or AI agents to run personalized outbound at scale.

We are looking for a Senior Full-Stack Software Engineer to build scalable systems that power AI-driven sales intelligence, joining our web application team with a heavy focus on backend processing jobs.

The Role

You'll join one of our 3 webapp teams and take ownership of entire components within the first few months. While the role involves frontend work to build customer-facing UIs, it is typically backend (PHP/Laravel) dominant. You will work closely with teammates across Europe and Brazil, and frequently with our go-to-market teams in the U.S., requiring comfortable async collaboration in English.

What You’ll Do

• Build user-facing UIs in collaboration with product managers and teammates.
• Build scalable data-heavy background processing jobs handling terabytes of data.
• Build new features with both humans and AI agents in mind (MCP).
• Integrate and maintain connections with external data providers, ensuring data reliability, consistency, and quality across ingestion pipelines.
• Participate in architectural discussions and make sound trade-off decisions.
• Design, build, and optimize relational database structures (MySQL).
• Collaborate closely with data scientists to optimize AI workflows and prompts.
• Debug, profile, and tune systems for reliability and performance at scale.
• Write clean, maintainable, and testable code with an eye for long-term stability.
• Continuously improve workflows, deployment, and monitoring practices.

Tech Stack (AWS)

• Frontend: TypeScript / Vue SPA
• Backend: PHP with Laravel for backend and data processing jobs
• Databases & Search: MySQL & OpenSearch
• Infrastructure: RabbitMQ, Datadog, GitHub, Linear

What We’re Looking For

• 4+ years of experience as a PHP developer (preferably with Laravel).
• 2+ years of experience as a frontend or full-stack developer (TypeScript).
• Ability to take ownership of outcomes, not just tasks.
• Full-time focus and accountability as part of a small, fast-moving team.
• Expertise in relational database modeling, query optimization, and high-performance tuning.
• Experience working in a startup or fast-moving environment.
• Fluency in English (written and spoken).
• Pragmatic mindset, balancing technical purity with delivery speed.

Benefits & Perks

• Competitive salary range: $80,000 - $100,000 annually
• Health benefits
• Remote-first culture with async-friendly collaboration
• Company and department-wide in-person off-sites around the world