Software Engineer – Backend

Weekday (YC W21)

. Design realistic and challenging backend engineering tasks using repositories and codebases .

Posted 11/12/2026contractRemote • United StatesMid-LevelSenior💰 $50 - $100 per hourWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates strong backend development expertise with proficiency in Python 3, Java, Rust, Go, C++, or TypeScript, alongside a solid understanding of data structures, algorithms, and software architecture. Capable of designing reproducible test environments and developing reliable verification mechanisms while effectively documenting technical requirements.

Highest-signal resume keywords

Backend Development ExperienceProficiency In Python 3, Java, Rust, Go, C++, Or TypeScriptDebugging Complex Backend SystemsDesigning Reproducible Test EnvironmentsStrong Written Communication Skills

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Backend DevelopmentAPI DevelopmentPerformance OptimizationCode RefactoringData StructuresAlgorithmsSoftware ArchitectureDeterministic Verification MechanismsComplex Bug FixesEngineering Solutions Implementation

Soft Skills

Strong Written CommunicationDocumentation Skills

Industry Keywords

Reinforcement Learning EnvironmentsSoftware Engineering PrinciplesLegacy System ModernizationMaintainable SoftwareScalable Software

Tech Stack

Tools & technologies

JavaPythonRustTypeScriptC++Go

About the role

Key responsibilities & impact

Design realistic and challenging backend engineering tasks using repositories and codebases
Develop problems involving complex bug fixes, backend feature implementation, API development, system refactoring, and performance optimization
Build reproducible environments for consistent execution and evaluation of coding tasks
Create deterministic verifiers that identify correct solutions across valid implementations and reject incomplete, incorrect, or hard-coded approaches
Develop reference solutions for engineering challenges
Evaluate tasks for clarity, technical relevance, and verifiability
Flag ambiguous or unsuitable problems rather than submitting them
Document task requirements, technical assumptions, and verification criteria clearly
Contribute to Reinforcement Learning Environments designed to evaluate and improve advanced AI models on software engineering challenges

Requirements

What you’ll need

Strong hands-on backend development experience in at least one of Python 3, Java, Rust, Go, C++, or TypeScript
Solid understanding of data structures, algorithms, software architecture, and core software engineering principles
Proven ability to debug complex backend systems, identify root causes, and implement reliable fixes
Experience developing backend features, working with large codebases, and improving application performance
Familiarity with code refactoring, legacy system modernization, and writing maintainable, scalable software
Ability to design reproducible test environments and develop reliable, deterministic verification mechanisms
Experience taking technical features or engineering solutions from problem definition through implementation and delivery
Strong written communication and documentation skills, with ability to explain complex technical concepts clearly
Candidates should be available to begin promptly and start first tasks within 24–48 hours of completing onboarding
Completion of screening questions, AI-powered interview, profile review, and onboarding required

Benefits

Comp & perks

Flexible, project-based contractor opportunity
Approximately 15 hours of availability per week
Fully remote work arrangement
Payments for approved tasks meeting defined project specifications
Flexible task workload depending on task complexity, expertise, and workflow