AlignerrCoding & software eval
Senior C# Full-Stack Engineer: AI Data & Infrastructure
up to $75/hr
About this role, in Alignerr's words
What if your C# expertise could directly shape the systems that power the world's most advanced AI models? We're looking for a Senior C# Full-Stack Engineer to design and build the data pipelines, annotation tooling, and evaluation infrastructure 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 full-stack tooling and backend services 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 workflows
- Identify bottlenecks and edge cases in data and system behavior, and implement scalable, production-ready fixes
- Participate in synchronous design reviews to iterate on system architecture and implementation decisions
Candidate background
Who You Are
- Full-stack developer with a strong systems programming background and deep C# expertise
- 3–5+ years of professional experience writing production C# code with a focus on modern standards
- Solid understanding of performance optimization, concurrency (threading, atomics), and memory safety
- Clear and precise written and verbal communicator — you can articulate technical decisions confidently
- Native or fluent English speaker
- Available to commit 20–40 hours per week consistently
Nice to Have
Show all 4 itemsHide these 4 items in Nice to Have
- Prior experience with data annotation, data quality, or evaluation systems
- Familiarity with AI/ML workflows, model training pipelines, or benchmarking systems
- Experience with distributed systems or developer tooling
- Background working with or alongside research teams in fast-moving technical environments
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 C# Full-Stack Engineer — AI Data & Infrastructure
About the Role
What if your C# expertise could directly shape the systems that power the world's most advanced AI models? We're looking for a Senior C# Full-Stack Engineer to design and build the data pipelines, annotation tooling, and evaluation infrastructure that leading AI labs depend on to train and improve next-generation AI.
This is a fully remote contract role working on real production systems — not toy problems. You'll collaborate with data, research, and engineering teams at the frontier of AI development, solving genuinely hard infrastructure and systems challenges at scale.
- 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 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, production-ready fixes * Participate in synchronous design reviews to iterate on system architecture and implementation decisions
Who You Are
* Full-stack developer with a strong systems programming background and deep C# expertise * 3–5+ years of professional experience writing production C# code with a focus on modern standards * Solid understanding of performance optimization, concurrency (threading, atomics), and memory safety * Clear and precise written and verbal communicator — you can articulate technical decisions confidently * Native or fluent English speaker * Available 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 pipelines, or benchmarking systems * Experience with distributed systems or developer tooling * Background working with or alongside research teams in fast-moving technical environments
Why Join Us
* Work directly on cutting-edge AI systems used by leading research labs * Fully remote and flexible — structure your work around your life * Freelance autonomy with the depth and impact of high-stakes engineering work * Collaborate with world-class engineers and researchers on problems that actually matter * Potential for ongoing work and contract extension as projects evolve and expand
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 391 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 140 distinct rates we count, 44 are lower and 92 are higher.
| Platform | Roles | Top of range, per hour |
|---|---|---|
| Alignerr (this platform) | 136 | $50 to $400 · median $100 |
| micro1 | 44 | $60 to $350 · median $120 |
| 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
- 100d3f6b-dc04-49cc-a1af-b2027b394a8c
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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