Software Development Engineer III - Custom Objects (Backend)

About Lumen Dynamics : Lumen Dynamics is an AI-powered business operating system that gives agencies, entrepreneurs and SMBs the infrastructure to build, automate and scale. Today, Lumen Dynamics supports SMBs across 150+ countries, fueling community-driven growth rooted in real customer outcomes. To date, businesses operating on Lumen Dynamics have generated over $7 billion in ecosystem value, demonstrating the impact of shared infrastructure at scale. By centralizing conversations, automation and intelligence into one system, we help businesses move faster, reduce complexity and execute efficiently. Behind the platform, Lumen Dynamics powers more than 4 billion API hits and 2.5 billion message events daily. With 250 terabytes of distributed data, 250+ microservices and over 1 million domain names supported, our architecture is built for performance, resilience and long-term scalability. Our people With over 2,000 team members across 10+ countries, Lumen Dynamics operates as a global, remote-first organization built for speed and ownership. We value initiative, clarity and execution, creating space for ambitious people to build systems that support millions of businesses worldwide. Here, innovation thrives, ideas are celebrated and people come first, no matter where they call home. Our impact Every month, Lumen Dynamics enables more than 1.5 billion messages, 200 million leads and 20 million conversations for the more than 1 million businesses we support. Behind those numbers are real people building independence, expanding opportunity and creating measurable impact. We’re proud to be a part of that. Learn more about us on our YouTube Channel or Blog Posts About the Role We are building systems that operate at scale - high write volumes, real-time state sync, and burst traffic that doesn’t politely warn before it arrives. We are looking for engineers who love owning systems end-to-end, care deeply about performance and reliability, and want to build things that don’t just work - but last.This is not a ticket-execution role. This is a system ownership role. Responsibilities: Backend System Ownership Design and evolve Node.js / NestJS services powering systems that operate at scale Take architectural decisions that balance scale, cost, and long-term maintainability API Craftsmanship Build well-typed, thoughtful REST contracts for high volume flows Think in versioning, backward compatibility, and clean boundaries Data at Scale Model and optimize MongoDB / Firestore schemas for high read/write workloads Design atomic updates and consistency strategies for distributed systems Scalability & Resilience Implement queues, caching layers, and rate limiting to handle burst traffic gracefully Design for failure modes before they happen Frontend Integration Ship modular Vue 3 UIs that efficiently consume APIs Optimize realtime updates and state management (Pinia) Improve Core Web Vitals and perceived performance Observability & Production Ownership Instrument logs, metrics, traces, and alerts Participate in on-call Debug real production issues Drive post-mortems to meaningful closure (not just documents) Mentorship & Leverage Review code thoughtfully Support junior engineers Raise engineering standards across the team Requirements: 4+ years of professional engineering experience Strong backend-heavy fullstack background Deep comfort with Node.js + TypeScript Experience building and scaling microservices (NestJS / Express) Modern frontend experience (Vue 3 or similar) Strong understanding of: API design Data modeling Distributed systems tradeoffs Concurrency & rate limiting Real production debugging experience Comfortable in cloud-native environments (GCP / AWS) CI/CD and containerization familiarity Bonus Points: Pub/Sub or message queue experience Event-driven systems exposure Domain-driven design familiarity Performance optimization work Experience reducing infra costs Our Tech Environment: Backend: Node.js, TypeScript, NestJS / Express Frontend: Vue 3, Pinia, Vite / Webpack, Tailwind Storage: MongoDB, Firestore, Redis, ElasticSearch Infra: GCP (GKE, Pub/Sub, Cloud Tasks) CI/CD: GitHub Actions, Docker, Kubernetes Testing: Jest, Vitest What You Will Get Ownership of real systems Complex problems worth solving Exposure to scale High engineering bar A team that values thoughtful design over rushed patches EEO Statement: The company is an Equal Opportunity Employer. As an employer subject to affirmative action regulations, we invite you to voluntarily provide the following demographic information. This information is used solely for compliance with government recordkeeping, reporting, and other legal requirements. Providing this information is voluntary and refusal to do so will not affect your application status. This data will be kept separate from your application and will not be used in the hiring decision. We encourage you to review our Privacy Policy before submitting your application Originally posted on Himalayas