Remote | Senior Software Engineer Job New York New York USA,Software Development

We are sharing a specialised consulting opportunity for experienced Senior Software Engineers with strong expertise in Python3, Java, Rust, Go, C++, Type Script, algorithms, debugging, feature development, codebase refactoring, and performance optimisation to contribute to an advanced AI training and software-engineering evaluation project.

Selected professionals will create reinforcement-learning environments that test advanced AI systems on realistic software-engineering problems involving bug fixing, feature implementation, refactoring, and performance optimisation. Each environment will require a reproducible technical setup together with a high-quality golden reference solution demonstrating the expected engineering approach. No prior experience in AI is required.

Key Responsibilities
Reinforcement Learning Environment Development

Create realistic software-engineering environments for AI evaluation
Design tasks involving debugging, feature development, refactoring, and optimisation
Build reproducible environments that allow technical solutions to be evaluated consistently
Define clear problem statements, constraints, and expected outcomes
Develop golden reference solutions demonstrating correct engineering approaches

Software Development & Feature Implementation

Contribute expert-level code across Python3, Java, Rust, Go, C++, or Type Script
Implement robust new functionality within existing codebases
Apply sound software-engineering principles to real-world development scenarios
Ensure new features are maintainable, scalable, and appropriately tested
Evaluate trade-offs across different implementation approaches

Debugging & Defect Resolution

Analyse complex software defects across varied codebases
Identify root causes rather than applying superficial fixes
Develop effective debugging strategies for difficult technical problems
Resolve correctness, reliability, and integration issues
Document reasoning behind technical diagnoses and fixes

Codebase Refactoring & Modernisation

Refactor legacy or difficult-to-maintain code
Improve structure, readability, modularity, and long-term maintainability
Preserve required behaviour while improving implementation quality
Identify unnecessary complexity and architectural weaknesses
Apply modern software-engineering practices to existing systems

Performance Optimisation

Identify performance bottlenecks across software systems
Analyse algorithmic and implementation-level inefficiencies
Improve runtime performance and resource usage where appropriate
Validate that optimisations preserve correctness
Explain technical trade-offs and performance impact clearly

Code Review & Technical Validation

Review peer-contributed code and technical submissions
Evaluate solutions for correctness, clarity, efficiency, and maintainability
Identify hidden defects, unsupported assumptions, or incomplete reasoning
Provide constructive technical feedback
Validate that submissions satisfy task and environment requirements

Technical Documentation & Reasoning

Document implementation decisions and solution approaches clearly
Explain debugging, refactoring, and optimisation strategies
Record technical assumptions and relevant trade-offs
Produce documentation that supports reproducibility and evaluation
Translate complex engineering reasoning into precise written explanations

Ideal Profile

Significant professional software-engineering experience
Strong hands-on expertise in at least one of Python3, Java, Rust, Go, C++, or Type Script
Deep understanding of algorithms and data structures
Strong command of software-engineering fundamentals
Proven ability to debug complex systems and resolve difficult defects
Experience implementing substantial product or platform features
Strong background in codebase refactoring and…