Senior Software Engineer – Platform

About the role

Fountain is looking for a Senior Software Engineer to join its compact platform squad. You will help build the foundational systems that power the entire Fountain ecosystem, enabling millions of frontline workers and hundreds of enterprise customers.

Key responsibilities

• Ship platform capabilities across all customer and internal products.
• Own performance, security, and stability for high‑traffic production systems.
• Enhance agentic systems, including coding agents and observability tools.
• Lead architectural decisions for human and agentic interfaces.
• Design reliable code, APIs, and contracts for humans and agents.
• Collaborate with product and engineering teams to deliver customer impact.
• Work autonomously with product managers and designers.
• Identify problems, ship fixes, and own outcomes like an early‑stage product team.

Required profile

• Minimum five years of professional backend engineering experience with production‑ready systems.
• Expert‑level systems design and architectural insight.
• Strong ability to evaluate technical trade‑offs, UX, APIs, and code quality.
• Hands‑on experience with agentic or LLM‑based systems in critical paths.
• Proactive initiative – ship unrequested features that add value.
• Comfortable thriving in autonomous, ambiguous environments without a structured ticket queue.
• Excellent written communication skills.

Required skills

• Backend development
• Systems design
• API design and implementation
• Performance optimization
• Security engineering
• Scalability engineering
• LLM‑based system integration
• Observability tooling