We are looking for a
Senior Full Stack Engineer
to build and maintain features across React microfrontends, TypeScript serverless Lambda functions, and Fastify services for a corporate tax provision platform. You will develop AWS infrastructure with Terraform, maintain GitLab CI/CD pipelines, write tests using Jest and Playwright, and leverage AI coding tools as a core part of daily development within a large multi-repo codebase. The role spans modern TypeScript and a legacy ASP.NET codebase and runs as a project engagement through end of 2026.
What you will do
- Build and maintain features across React microfrontends, TypeScript/Node.js serverless applications, and Fastify services.
- Contribute to shared business logic across frontend and backend applications.
- Develop and maintain unit, integration, and E2E tests.
- Develop and deploy AWS infrastructure using Terraform.
- Participate in GitLab CI/CD pipeline development and maintenance.
- Collaborate with architects and product teams on APIs, async job patterns, and data layer abstractions.
- Leverage AI coding assistants effectively within a large, multi-repo codebase.
- Maintain the legacy ASP.NET Framework 4.7.2 application as needed during migration
Must haves
- 3+ years of strong TypeScript/JavaScript
with Node 18+.
- Proficiency with
React 18
and modern React patterns.
- Experience with
React microfrontend architecture
.
- Experience with backend APIs and serverless applications using
Fastify, NestJS, AWS Lambda, and API Gateway
.
- Experience with
PostgreSQL
.
- Experience with
AWS and Terraform
.
- Experience with
Docker and GitLab CI/CD
.
- Experience with
Jest, Playwright, and/or K6
.
- Hands-on experience with
AI coding tools
such as Cursor, GitHub Copilot, Claude Code, or equivalent.
- Upper-Intermediate English level.
Nice to haves
- Working knowledge of C# / .NET.
- AG Grid and/or SpreadJS.
- Stryker mutation testing.
- OpenTelemetry / Grafana Faro.
- Amplitude.
- ASC 740 tax pro