Senior C# Full-Stack Engineer — AI Data & Infrastructure

Labelbox; Remote; GBP 80,000 - 100,000; Part time

Job summary

A technology company seeks a Senior C# Full-Stack Engineer to design and optimize systems for AI data pipelines. The role is remote with a commitment of 20–40 hours per week, offering competitive hourly compensation. Ideal candidates should have strong experience in C++ programming, performance optimization, and full-stack development. Strong communication skills and the ability to collaborate within teams are essential. The position allows for professional growth and engagement with cutting-edge technology.

Qualifications

• 3-5+ years of professional experience with production C++.
• Strong systems programming background in performance optimization and memory safety.
• Ability to commit 20–40 hours per week.

Responsibilities

• Design, build, and optimize systems in C# for AI data pipelines.
• Develop full-stack tooling and backend services for data annotation.
• Collaborate with teams to support model training workflows.

Skills

Fluent English

Full-stack development

C++ programming

Performance optimization

Concurrency

Clear communication

Job description

About the Job

Alignerr connects top technical experts with leading AI labs to build, evaluate, and improve next-generation models. We work on real production systems and high-impact research workflows across data, tooling, and infrastructure.

Position

Senior C# Full-Stack Engineer — AI Data & Infrastructure

Type: Contract, Remote
Commitment: 20–40 hours/week
Compensation: Competitive, hourly (based on experience)

$50 - $75 an hour

Role Responsibilities

• Design, build, and optimize high-performance systems in C# supporting AI data pipelines and evaluation workflows
• Develop full-stack tooling and backend services for large-scale data annotation, validation, and quality control
• Improve reliability, performance, and safety across existing C# codebases
• Collaborate with data, research, and engineering teams to support model training and evaluation workflows
• Identify bottlenecks and edge cases in data and system behavior, and implement scalable fixes
• Participate in synchronous reviews to iterate on system design and implementation decisions

Qualifications

Must-Have

• Native or fluent English speaker
• Full-stack developer experience with a strong systems programming background
• 3-5+ years of professional experience writing production C++ (with a focus on modern standards like C++17 or C++20)
• Strong systems programming background in performance optimization, concurrency (e.g., threading, atomics), and memory safety (e.g., RAII, smart pointers, sanitizers)
• Clear written and verbal communication skills
• Ability to commit 20–40 hours per week

Preferred

• Prior experience with data annotation, data quality, or evaluation systems
• Familiarity with AI/ML workflows, model training, or benchmarking pipelines
• Experience with distributed systems or developer tooling

Application Process

• Submit your resume
• Complete a short technical screening
• Project matching and onboarding