Staff Fullstack Engineer – Internal Tools

LILT

. Build and run internal tools supporting LILT’s Applied AI benchmarking business .

Posted 10/6/2026full-timeUnited StatesLead💰 $190,000 - $230,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates extensive experience in full-stack software engineering, with a strong focus on building and managing production systems across multiple languages and runtimes. Proficient in developing internal tools and automation solutions while ensuring high standards in code quality and system architecture.

Highest-signal resume keywords

Full-Stack Software EngineeringPython Backend Framework (FastAPI)React/TypeScript Frontend DevelopmentCI/CD and Infrastructure-as-Code (Terraform)API Integration and ChatOps Automation

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

PythonFastAPIPostgresReactTypeScriptAsync SQLAlchemyGoJavaDockerTerraform

Soft Skills

MentoringTechnical DirectionCollaboration

Tools & Technologies

GitHub APIOAuth/OIDC SSOSlack Bot IntegrationsArgoCDHelm

Industry Keywords

Applied AIData QualityBackground Job SystemsAudio Quality PipelinesChatOps Automation

Tech Stack

Tools & technologies

DockerJavaPostgresPythonReactTerraformTypeScriptGo

About the role

Key responsibilities & impact

Build and run internal tools supporting LILT’s Applied AI benchmarking business
Translate benchmark and data-quality requirements into scoped technical designs with researchers and TPMs
Own workforce-management tools for external contributors, including vetting, assessment, QC, payment/delivery tracking, roster, and reporting exports
Own architecture and long-term technical direction across multiple services and the platform
Extend IAA and audio-QA pipelines, including outlier detection, ASR sidecar enhancements, LLM-based QC, and audio-quality scoring
Design and ship modules integrating benchmark and vetting workflows into the multi-stage review lifecycle
Own API key provisioning and budget-governance systems
Build self-serve ChatOps automation for engineering and contributors
Harden background worker and job-processing infrastructure
Set and enforce testing, CI/CD, deployment, infrastructure-as-code, and release-automation practices
Raise the technical bar through code reviews, design documents, mentoring, and technical direction

Requirements

What you’ll need

5+ years of professional full-stack software engineering experience
Track record of owning production systems end-to-end across more than one runtime/language
Deep experience with a Python backend framework (FastAPI or comparable), async SQLAlchemy, and Postgres
Production experience in at least one statically typed backend language (Go, Java, or similar)
Strong React/TypeScript frontend experience, including component architecture, state management, and modern data-fetching layers
Experience building and operating background job/worker systems with failure tolerance and idempotency
Experience integrating third-party and platform APIs, including GitHub API, OAuth/OIDC SSO, and at least one LLM API
Experience building Slack or comparable chat-platform bot integrations with operational guardrails
Comfort reading and extending applied-statistics or ML-adjacent code
Solid grasp of CI/CD, Docker, Helm, ArgoCD/GitOps or comparable tools, and Terraform or comparable infrastructure-as-code
Experience debugging and optimizing native-library memory growth in long-running Python worker processes via safe process recycling
Experience building and owning internal platforms/tools for non-engineering teams
Strong plus: audio/speech pipelines, data-labeling or crowdsourced-contributor workforce tools, agreement metrics, notification and delivery systems, heterogeneous data-source abstractions, ChatOps automation, short-lived rotatable service-to-service JWT authentication, and ownership of systems with different runtimes
Bonus: LLM-as-judge or LLM-based QA/review pipelines, OpenTelemetry, LLM provider gateway/routing services, and data export/reporting tools

Benefits

Comp & perks

Equity
Global collaboration
Growth opportunities
Fair, inclusive, and transparent hiring process