Software Engineer - Level III (Full-Stack)

With a company culture rooted in collaboration, expertise and innovation, we aim to promote progress and inspire our clients, employees, investors and communities to achieve their greatest potential. Our work is the catalyst that helps others achieve their goals. In short, We Enable Possibility℠.

We're looking for a passionate, detail-oriented Senior Full Stack Engineer who is equally comfortable working across the frontend and backend. You'll contribute to both our user-facing React/Angular applications and our Node.js microservices, helping us build, scale, and maintain the systems that power Thimble's platform — including the external-facing APIs our partners rely on.

This role goes beyond feature delivery. You'll help shape the technical strategy of the platform, influence architectural direction, and partner directly with product and growth teams to turn business objectives into engineering outcomes — from improving how customers discover and purchase coverage to scaling the systems behind new products and markets. You thrive in event-driven, distributed architectures and have a strong instinct for writing clean, observable, and resilient code.

Technical Leadership & Architecture

• 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

Full Stack Delivery

• 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

Strategy & Growth

• 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

• Frontend: React (Jest), Angular 2+ (Jasmine & Karma), Next.js, Razzle, TypeScript

• Backend: Node.js microservices (Koa, NestJS)

• Database: MongoDB

• Messaging: AWS SNS & SQS (event-driven async flows)

• Cloud: AWS

• E2E Testing: Playwright

• Monitoring: AWS CloudWatch, Sentry

• AI Tooling: Claude Code (AI-assisted, agentic development)

• CI/CD: CircleCI

• 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

• Experience in InsurTech, FinTech, or other regulated industries

• Experience supporting growth engineering — experimentation platforms, A/B testing frameworks, funnel analytics, or conversion optimization

• Experience with agentic coding and AI-assisted development workflows — using tools like Claude Code to accelerate delivery while maintaining quality

• Knowledge of Infrastructure as Code (Terraform, AWS CDK, or similar)

• Experience with CI/CD pipeline configuration — particularly CircleCI

• Direct involvement in building a new application from the ground up or leading a large-scale migration (e.g., a framework or database migration)

• Familiarity with homegrown or complex internal component libraries on the frontend

• Contributions to open source projects

Do you like solving complex business problems, working with talented colleagues and have an innovative mindset? Arch may be a great fit for you. If this job isn’t the right fit but you’re interested in working for Arch, create a job alert! Simply create an account and opt in to receive emails when we have job openings that meet your criteria. Join our talent community to share your preferences directly with Arch’s Talent Acquisition team.