Lago · 1 month ago
Support Engineer (L3) (Remote Europe)
United States
Full-time
Remote
Senior Level
$70K/yr - $100K/yr
6+ years expLago is a leading open-source billing platform on a mission to simplify billing for SaaS companies. They are seeking a Support Engineer (L3) to debug production issues, ship fixes, and ensure system reliability while collaborating with various teams to enhance product insights and improvements.
DatabaseInformation TechnologySoftware
Responsibilities
Investigate, reproduce, and resolve production issues across Lago’s stack: Rails backend, APIs, integrations, and React front-end
Ship code-level fixes or patches directly to production, in collaboration with Core Engineering when needed
Perform root-cause analysis for incidents and propose preventive improvements
Review customer or partner pull requests (e.g., private billing integrations) and ensure safe merges
Contribute to observability by improving logs, tracing, and alerting coverage
Participate in post-mortems, reliability reviews, and debugging playbook improvements
Mentor L1/L2 engineers on debugging, reproducibility, and communication best practices
Build or enhance internal tools and automations to prevent recurring issues
Participate in a scheduled on-call rotation for critical (Sev 1) customer issues outside standard business hours, including evenings and weekends, in accordance with local labor laws and the terms of your employment contract
Qualification
Required
6+ years of experience as a software engineer (Rails preferred)
Proficiency in Ruby, SQL, and debugging live production systems
Experience with background job frameworks (e.g., Sidekiq) and message queues (Kafka a plus)
Familiarity with REST APIs, webhooks, and data integrations
Understanding of containerized environments (Docker, AWS, CI/CD)
Excellent written and verbal communication skills
A mindset of ownership, curiosity, and resilience
Preferred
Experience contributing to or supporting open-source projects
Familiarity with billing systems, event-driven architecture, or developer tools
Experience with observability stacks (e.g., Datadog, Grafana, Sentry)
Exposure to frontend debugging in React and TypeScript
Company
Lago
Open Source Billing API for Product-Led SaaS
11-50 employees
Funding
Current Stage
Early StageTotal Funding
$22.12MKey Investors
FirstMarkSignalFireY Combinator
2024-03-14Series A· $15M
2023-01-01Seed· $7M
2021-08-31Pre Seed· $0.12M
Leadership Team
Anh-tho Chuong
Co-founder & CEO
Raffi Sarkissian
Co-Founder (Product)
Recent News
Business Insider
2025-06-27
Company data provided by crunchbase