Senior Full-Stack Engineer: Scale & Architecture Leader

Arch Insurance Group Inc.; United States; Remote; USD 140,000 - 200,000; Full time

Job summary

Arch Insurance Group Inc. is seeking a Senior Full Stack Engineer to own design across frontend and backend, contributing to React/Angular UIs and Node.js microservices.

You will shape technical strategy, drive architecture, and partner with product and growth to translate business goals into scalable engineering outcomes; experience with event-driven systems and observability is valued.

Qualifications

• 5+ years of professional full stack development experience, with a track record of leading system design on complex, high-scale platforms.
• Proven ability to define architectural principles and drive engineering best practices across a team.
• Experience making high-impact design decisions with clear reasoning around trade-offs - scalability vs. cost, performance vs. maintainability, speed vs. reliability.
• Strong data modeling skills - designing schemas and structures that are clean, efficient, and built to scale.
• Strong proficiency in Node.js - building and maintaining production microservices.
• Solid experience with MongoDB - schema design, indexing, aggregation pipelines, and query optimization.
• Hands-on experience with event-driven architectures, specifically AWS SNS and SQS or equivalent pub/sub and message queue systems.
• Proficiency in React and/or Angular 2+ for building and maintaining modern frontend applications.
• Experience with monitoring and observability tools (e.g., CloudWatch, Sentry, or similar) - instrumenting services, creating dashboards, configuring alerts, and using distributed tracing to diagnose issues.
• Experience writing tests across the stack - unit, integration, and E2E (Jest, Jasmine/Karma, Playwright or similar)
• General understanding of AWS services beyond messaging - S3, IAM, Lambda, EC2, or similar
• A business-minded approach to engineering - comfort connecting technical work to company goals, growth metrics, and customer outcomes
• Excellent research and investigation skills - able to navigate unfamiliar codebases and ambiguous technical challenges systematically
• Strong problem-resolution mindset - thorough, communicative, and effective under pressure
• Ability to plan and own complex features independently from design through to production
• Strong communication skills and comfort working in a remote, async-friendly environment

Responsibilities

• Lead end-to-end system design for complex, high-scale backend platforms - owning the full lifecycle from requirements through implementation and iteration
• Define architectural principles and engineering best practices that raise the quality bar across the team
• Make high-impact design decisions involving deliberate trade-offs between scalability, performance, cost, and long-term maintainability
• Design data models that are well-structured, efficient, and built to evolve alongside the product
• Design, develop, and maintain full stack features across React/Angular frontends and Node.js backend microservices
• Build and evolve RESTful and event-driven APIs - both internal services and external-facing APIs consumed by our partners - ensuring they are well-tested, documented, and production-ready
• Work with MongoDB to design schemas, write efficient queries, and manage data at scale
• Develop and maintain event-driven workflows using AWS SNS and SQS to manage asynchronous system flows reliably
• Instrument services with monitoring and observability tooling - setting up metrics, alerts, dashboards, and distributed tracing to ensure system health
• Investigate and resolve complex bugs and production incidents end-to-end - from the UI down to the service layer
• Partner with product, design, and growth teams on growth initiatives - customer acquisition, activation, and conversion funnel improvements - translating experiment ideas into shippable, measurable features
• Contribute to experimentation and A/B testing efforts, using data and metrics to validate impact and inform the next iteration
• Align technical decisions with business strategy - weighing near-term growth opportunities against long-term platform health, and communicating those trade-offs clearly to stakeholders
• Conduct technical research and propose solutions to new and ambiguous engineering challenges
• Plan and manage your own work independently, breaking down large features into well-scoped tasks and driving them to delivery
• Participate in code reviews, architectural discussions, and contribute to engineering best practices
• Collaborate closely with product managers, designers, and other engineers across the stack

Skills

System design leadership

Backend development

Frontend development

React/Angular

Node.js

MongoDB

AWS

Event-driven architecture

Observability

Code reviews

Tools

CircleCI

Sentry

CloudWatch

AWS SNS/SQS

Job description

Arch Insurance Group Inc. is seeking a Senior Full Stack Engineer to own design across frontend and backend, contributing to React/Angular UIs and Node.js microservices.

You will shape technical strategy, drive architecture, and partner with product and growth to translate business goals into scalable engineering outcomes; experience with event-driven systems and observability is valued.