Software Engineer, TypeScript

Jobtailor; Deutschland; Remote; EUR 70.000 - 110.000; Vollzeit

Zusammenfassung

Jobtailor in Germany seeks an experienced software engineer to tackle complex TypeScript/JavaScript codebase exploration tasks. You will work with a pre-validated pool of pinned repositories, examining PR histories to understand subsystems and rewrite questions to push frontier coding agents.

The role requires 3+ years of professional software engineering experience, deep TS/JS knowledge, and fluency in English.

Qualifikationen

• 3+ years of professional software engineering experience.
• Substantial production TypeScript experience.
• Ability to navigate large, unfamiliar TypeScript monorepos and explain runtime behavior.
• Fluency in advanced type systems, module resolution, bundlers and transpilers, and Node and browser runtimes.
• Comfort reading compiler and plugin internals.
• Experience with developer tooling, compilers, test frameworks, GraphQL servers, or state machines highly relevant.
• Precise written English; comfortable with git at commit level.

Aufgaben

• Build difficult codebase-exploration tasks involving production TypeScript and JavaScript repositories.
• Select tasks from a pre-validated pool of pinned TypeScript repositories with engineering questions, rubrics, foils, and golden solutions.
• Explore repositories and relevant pull-request or issue history to understand subsystems.
• Rewrite questions to challenge frontier coding agents while remaining well-defined and answerable.
• Adjust rubrics and foils to reward correct reasoning and reject plausible-but-wrong answers.
• Run the full validation loop in Mercor Studio — Check, Golden, Run, Analyze — and iterate until all stages pass.
• Document work in task READMEs and submit tasks for expert review.
• Address reviewer feedback on returned tasks.
• Complete work in Mercor Studio with time tracked by Insightful and access provisioned through Okta.
• Work is reviewed by a second engineer and a super reviewer before acceptance.

Kenntnisse

TypeScript

JavaScript

Advanced Type Systems

Module Resolution

Bundlers

Transpilers

Node.js

Browser Runtimes

Git Proficiency

Precise Written English

Tools

Mercor Studio

Insightful

Okta

Git

Containerized Environments

Command-Line Tooling

Jobbeschreibung

• Build difficult codebase-exploration tasks involving production TypeScript and JavaScript repositories
• Select tasks from a pre-validated pool of pinned TypeScript repositories with engineering questions, rubrics, foils, and golden solutions
• Explore repositories and relevant pull-request or issue history to understand subsystems
• Rewrite questions to challenge frontier coding agents while remaining well-defined and answerable
• Adjust rubrics and foils to reward correct reasoning and reject plausible-but-wrong answers
• Run the full validation loop in Mercor Studio — Check, Golden, Run, Analyze — and iterate until all stages pass
• Document work in task READMEs and submit tasks for expert review
• Address reviewer feedback on returned tasks
• Complete work in Mercor Studio with time tracked by Insightful and access provisioned through Okta
• Work is reviewed by a second engineer and a super reviewer before acceptance

Requirements

• 3+ years of professional software engineering experience
• Substantial production TypeScript experience
• Ability to navigate large, unfamiliar TypeScript monorepos and explain runtime behavior
• Fluency in advanced type systems, module resolution, bundlers and transpilers, and Node and browser runtimes
• Comfort reading compiler and plugin internals
• Experience with developer tooling, compilers, test frameworks, GraphQL servers, or state machines highly relevant
• Precise written English
• Comfortable with git at commit level, containerized environments, and command-line tooling
• Must complete identity verification, background check, signed Terms of Work and CIIAA, tax form, and short calibration quiz before task access
• Qualified applicants may be asked to complete a brief technical assessment or provide additional information

Core Competencies

Demonstrates extensive experience in TypeScript and JavaScript, with a strong ability to navigate and manipulate large codebases. Proficient in developer tooling, advanced type systems, and effective documentation practices.

Highest-signal resume keywords

• TypeScript Experience
• JavaScript Proficiency
• Developer Tooling Expertise
• Advanced Type Systems Knowledge
• Git Proficiency

Hard Skills

• TypeScript
• JavaScript
• Advanced Type Systems
• Module Resolution
• Bundlers
• Transpilers
• Node.js
• Browser Runtimes
• Compiler Internals
• Test Frameworks

Soft Skills

• Precise Written English

Industry Keywords

• Codebase Exploration
• Pull-Request History
• Issue History
• Rubrics
• Foils
• Golden Solutions
• State Machines
• GraphQL Servers

Tools & Technologies

• Mercor Studio
• Insightful
• Okta
• Git
• Containerized Environments
• Command-Line Tooling