At a Glance
- Tasks: Design and build high-performance backend systems in C# for AI data pipelines.
- Company: Join Alignerr, a leader in AI infrastructure development.
- Benefits: Fully remote, flexible hours, and freelance autonomy.
- Other info: Opportunity for ongoing work and contract extension as new projects launch.
- Why this job: Make a real impact on cutting-edge AI projects with leading research labs.
- Qualifications: 5+ years in C#, strong systems programming, and API development experience.
The predicted salary is between 50 - 70 € per hour.
About The Role
What if your C# expertise could directly shape the infrastructure powering the next generation of AI? We're looking for a Senior Backend Engineer to design and build the high-performance data pipelines, annotation tooling, and evaluation systems that leading AI labs depend on to train and improve their models. This is a fully remote contract role with meaningful technical scope. You'll work on real production systems — not toy projects — alongside data, research, and engineering teams at the frontier of AI development.
Organization: Alignerr
Type: Hourly Contract
Location: Remote
Commitment: 20–40 hours/week
What You'll Do
- Design, build, and optimize high-performance backend systems in C# supporting AI data pipelines and evaluation workflows
- Develop backend services and tooling for large-scale data annotation, validation, and quality control
- Build and maintain RESTful APIs and RPC services for reliable inter-service communication
- Integrate with cloud-native data services and orchestrate workflows via message bus architectures
- Improve reliability, performance, and safety across existing C# codebases
- Identify bottlenecks and edge cases in data and system behavior, then implement scalable, durable fixes
- Collaborate with data, research, and engineering teams to support model training and evaluation workflows
- Participate in synchronous design reviews to iterate on architecture and implementation decisions
Who You Are
- 5+ years of professional experience building scalable backend services in C#
- Strong systems programming background with full-stack exposure
- Mastery of modern frameworks for building RESTful APIs and RPC services
- Experienced with cloud-native data services and message bus / event-driven architectures
- Native or fluent English speaker with clear written and verbal communication skills
- Self-directed and reliable — able to commit 20–40 hours per week and deliver consistently
- Sharp eye for performance bottlenecks, edge cases, and system-level failure modes
Nice to Have
- Prior experience with data annotation, data quality pipelines, or model evaluation systems
- Familiarity with AI/ML workflows, model training, or benchmarking infrastructure
- Experience with distributed systems, developer tooling, or data orchestration platforms
Why Join Us
- Work on cutting-edge AI infrastructure projects alongside leading research labs
- Fully remote and flexible — work from anywhere, on a schedule that suits you
- Freelance autonomy with the structure and purpose of high-impact engineering work
- Make a direct, tangible contribution to the systems that shape how AI models are built and evaluated
- Potential for ongoing work and contract extension as new projects launch
Senior Backend Engineer (C#) - AI Data Platform in London employer: Alignerr
Alignerr is an exceptional employer for Senior Backend Engineers, offering the unique opportunity to work on cutting-edge AI infrastructure projects that directly impact the future of technology. With a fully remote and flexible work environment, employees enjoy the autonomy of freelance work while contributing to high-impact engineering tasks alongside leading research labs. The company fosters a culture of collaboration and innovation, providing ample opportunities for professional growth and the potential for ongoing contract extensions as new projects emerge.
StudySmarter Expert Advice🤫
We think this is how you could land Senior Backend Engineer (C#) - AI Data Platform in London
✨Tip Number 1
Network like a pro! Reach out to your connections in the tech world, especially those in AI and backend engineering. A friendly chat can lead to opportunities that aren’t even advertised yet.
✨Tip Number 2
Show off your skills! Create a portfolio or GitHub repository showcasing your C# projects, especially those related to backend systems or AI. This gives potential employers a taste of what you can do.
✨Tip Number 3
Prepare for technical interviews by brushing up on your C# knowledge and system design principles. Practice coding challenges and be ready to discuss your past projects in detail.
✨Tip Number 4
Don’t forget to apply through our website! It’s the best way to ensure your application gets seen by the right people. Plus, we love seeing candidates who take that extra step!
We think you need these skills to ace Senior Backend Engineer (C#) - AI Data Platform in London
Some tips for your application 🫡
Show Off Your C# Skills:Make sure to highlight your experience with C# in your application. We want to see how you've built scalable backend services and tackled performance bottlenecks. Don’t hold back on the details!
Tailor Your Application:Take a moment to customise your application for this role. Mention specific projects where you’ve designed or optimised backend systems, especially those related to AI or data pipelines. It’ll help us see how you fit into our team.
Be Clear and Concise:When writing your application, keep it straightforward. Use clear language to describe your experiences and skills. We appreciate a well-structured application that gets straight to the point!
Apply Through Our Website:Don’t forget to submit your application through our website! It’s the best way for us to receive your details and ensures you’re considered for the role. We can’t wait to hear from you!
How to prepare for a job interview at Alignerr
✨Know Your C# Inside Out
Make sure you brush up on your C# skills before the interview. Be ready to discuss your experience with building scalable backend services and any frameworks you've used for RESTful APIs. They’ll likely ask you to solve a coding problem, so practice common algorithms and data structures in C#.
✨Understand AI Data Pipelines
Familiarise yourself with AI data pipelines and how they function. Since this role involves working on high-performance data systems, be prepared to discuss your understanding of data annotation, validation, and quality control processes. Showing that you can connect your backend expertise to AI workflows will set you apart.
✨Prepare for System Design Questions
Expect questions about system design and architecture. Think about how you would build and optimise backend systems for AI applications. Be ready to explain your thought process and decisions during design reviews, as collaboration is key in this role.
✨Showcase Your Problem-Solving Skills
Highlight your ability to identify bottlenecks and edge cases in existing systems. Prepare examples from your past work where you implemented scalable solutions or improved performance. This will demonstrate your proactive approach and reliability, which are crucial for this position.
