AlignerrCoding & software eval
Senior Backend Engineer (C#) - AI Data Platform
up to $75/hr
About this role, in Alignerr's words
What if your expertise in C# and backend systems could directly shape the infrastructure powering the world's most advanced AI models? We're looking for a Senior C# Engineer to build and optimize the data pipelines, annotation tooling, and evaluation systems that leading AI labs depend on to train and improve next-generation AI.
What you'll do
- Design, build, and optimize high-performance C# systems supporting AI data pipelines and evaluation workflows
- Develop backend services and full-stack tooling for large-scale data annotation, validation, and quality control
- Improve reliability, performance, and safety across existing C# codebases
Show all 6 itemsHide the other 3 in What you'll do
- Collaborate with data, research, and engineering teams to support model training and evaluation
- Identify bottlenecks and edge cases in data and system behavior — then implement scalable, production-ready fixes
- Participate in synchronous design reviews to iterate on architecture and implementation decisions
Candidate background
Who You Are
- Native or fluent English speaker with clear written and verbal communication skills
- 5+ years of professional experience building scalable backend services in C#
- Strong systems programming background with full-stack development experience
- Deep expertise in modern frameworks for building RESTful APIs and RPC services for inter-service communication
- Experienced integrating with cloud-native data services and orchestrating workflows via message bus architectures
- Able to commit 20–40 hours per week consistently
Nice to Have
Show all 3 itemsHide these 3 items in Nice to Have
- 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
Quoted from selected sections of Alignerr's posting. The full posting may state other conditions. Read the full posting
A closer look
More context, when you need it.
Full job descriptionThe original posting, in Alignerr's words
Posted by Alignerr, reproduced here so you can judge the role before clicking. Original posting ↗
Senior Backend Engineer (C#) — AI Data Platform
About the Role
What if your expertise in C# and backend systems could directly shape the infrastructure powering the world's most advanced AI models? We're looking for a Senior C# Engineer to build and optimize the data pipelines, annotation tooling, and evaluation systems that leading AI labs depend on to train and improve next-generation AI.
This is a fully remote contract role with flexible scheduling. You'll work on real production systems alongside data, research, and engineering teams — doing work that has a measurable impact on how AI is built.
- Organization: Alignerr - Type: Hourly Contract - Location: Remote - Commitment: 20–40 hours/week
What You'll Do
* Design, build, and optimize high-performance C# systems supporting AI data pipelines and evaluation workflows * Develop backend services and full-stack tooling 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 * Identify bottlenecks and edge cases in data and system behavior — then implement scalable, production-ready fixes * Participate in synchronous design reviews to iterate on architecture and implementation decisions
Who You Are
* Native or fluent English speaker with clear written and verbal communication skills * 5+ years of professional experience building scalable backend services in C# * Strong systems programming background with full-stack development experience * Deep expertise in modern frameworks for building RESTful APIs and RPC services for inter-service communication * Experienced integrating with cloud-native data services and orchestrating workflows via message bus architectures * Able to commit 20–40 hours per week consistently
Nice to Have
* 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
Why Join Us
* Work directly on cutting-edge AI infrastructure alongside leading research labs * Fully remote and flexible — work from wherever you do your best work * Freelance autonomy with the structure and impact of meaningful, high-stakes engineering * Contribute to systems that directly influence how next-generation AI models are built and evaluated * Potential for ongoing work and contract extension as new projects launch
Working with AlignerrPay, getting started and work, from Alignerr's own pages
What the platform publishes in general. These are not extra terms confirmed for this particular role.
- Getting paid
- Billed weekly, Monday to Sunday, with approved work paid by the following Friday, according to Labelbox's help center. Payment goes through Stripe Connect or PayPal depending on your location, with one provider per country. intercom.help/labelbox/en/articles/13600616-alignerr-paym..., alignerr.com/process
- Before your first paid task
- Sign up, apply, verify your identity, set up billing and onboard. Some jobs add a Zara AI interview or domain assessments. alignerr.com/process
- How much work
- Time to your first project depends on demand and your skills, and there is no minimum number of hours. alignerr.com/faqs
- Contract
- Independent contractor, under terms with ALIGNERR LLC. alignerr.com/faqs, alignerr.com/privacy
Read on the pages linked above on 24 Sep 2026. Platforms change these terms, so check the linked page before you rely on one.
How does the pay compare?Across Coding & software eval roles, not this role alone
From our own daily reads of every open listing on the platforms we follow, not from Alignerr's posting. How we count.
Pay across the field: Coding & software eval
Across 393 roles in this field with a stated hourly rate in US dollars, on 14 platforms, the middle half pays $65 to $120 an hour at the top of the range, and the median is $95. This role's top rate, $75, is in the middle half. Of the 141 distinct rates we count, 45 are lower and 92 are higher.
| Platform | Roles | Top of range, per hour |
|---|---|---|
| Alignerr (this platform) | 136 | $50 to $400 · median $100 |
| micro1 | 46 | $35 to $350 · median $110 |
| Handshake AI | 43 | $47 to $125 · median $80 |
| Meridial (Invisible) | 34 | $22 to $150 · median $60 |
| Mercor | 33 | $60 to $200 · median $105 |
Sources and listing historyWhere this information comes from
This listing's history
- First seen here on 27 Aug 2026, and still on Alignerr's list when we last read it on 13 Oct 2026.
- The listed pay has not changed since then.
- Posted by Alignerr
- First seen by AIPayList
- Last seen live
- Listing ID
- 5766041e-24ee-4b23-b08b-7ca7aedc4bdb
Pay as the source states it: “$50-75/hr”.
Platforms sometimes change a rate after posting. Every listing here is re-read at least once a day and corrected when its source moves, so a difference you see on the platform is usually a change made since the last read. How freshness works.
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