Level

Senior Full-Stack WebApp Engineer

Level
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3 months ago
Bellevue, WA, USASenior

Base Salary

$98k - $244k/yr

Responsibilities

  • Own end-to-end full-stack feature delivery across TypeScript web clients and Kotlin/Java backend services, including UX, APIs, data modeling, and persistence.
  • Design and evolve authentication, account, invitation, onboarding, authoring, and administrative platform surfaces.
  • Architect and implement REST and gRPC APIs and long-lived backend services reused across web, mobile, and native clients.
  • Contribute to RFCs, architecture reviews, shared libraries, frameworks, developer tooling, and platform direction.
  • Define and operate reliability targets, observability, performance optimization, security controls, and incident response for owned services.
  • Partner with product, design, mobile, infrastructure, QA, and DevProd teams to plan, review, test, and release software.
  • Improve web architecture, technical foundations, developer experience, technical debt, production stability, and scalability.
  • Mentor mid-level and associate engineers through pairing, code reviews, and technical guidance.

Requirements

  • 5+ years of professional full-stack web engineering experience shipping production systems used by real users.
  • Strong proficiency with TypeScript and a modern component framework, preferably React, including state management, accessible UI patterns, and browser performance optimization.
  • Strong backend proficiency with Kotlin or Java on the JVM, or TypeScript for shared platform libraries and tooling, plus experience operating long-lived services.
  • Understanding of HTTP, REST, gRPC, and protobuf, with experience designing service contracts.
  • Experience with PostgreSQL and product data modeling, plus familiarity with DynamoDB, Redis, caching, queues, and eventual-consistency trade-offs.
  • Working knowledge of AWS, Docker, Kubernetes, and CI/CD pipelines; familiarity with Linkerd, ArgoCD, and Terraform is preferred.
  • Strong unit, integration, and end-to-end testing discipline and experience partnering with QA or DevProd.
  • Strong written and verbal communication, design discussion leadership, RFC writing, and ability to explain technical trade-offs.
  • Experience with authentication and identity systems such as OAuth/OIDC, SSO, session and token management, and third-party providers is preferred.
  • Experience with authoring tools, CMSes, internal back-office applications, shared design systems, component libraries, Backstage, internal developer platforms, or developer productivity surfaces is preferred.
  • Familiarity with OpenTelemetry, structured logging, SigNoz, Grafana, and Datadog is preferred.
  • Background in EdTech, K-12, FERPA, COPPA, WCAG, privacy, or accessibility requirements is preferred.

Benefits

  • This is an onsite role requiring five days per week in the workplace.

Tech Stack

Amazon DynamoDBAWSDatadogDockerGrafanagRPCJavaKotlinKubernetesPostgreSQLReactReact NativeRedisTerraformTypeScript
Level

About Level

201-500 employees
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