AlignerrCoding & software eval
Software Engineer (C#) - Internal Tooling
up to $75/hr
About this role, in Alignerr's words
What if your C# expertise could directly shape the infrastructure powering the next generation of AI? We're looking for a senior full-stack C# engineer to build the data pipelines, annotation systems, and evaluation tooling that leading AI labs depend on every day.
What you'll do
- Design and build high-performance C# systems that support large-scale AI data pipelines and evaluation workflows
- Develop full-stack tooling and backend services for data annotation, validation, and quality control at scale
- Improve reliability, performance, and correctness across existing C# codebases
- Build robust benchmarking and evaluation harnesses to measure system behavior
- Implement interoperability solutions — such as invoking Python ML models from .NET or wrapping native libraries
Show all 8 itemsHide the other 3 in What you'll do
- Identify bottlenecks and edge cases, then ship scalable, well-reasoned fixes
- Collaborate with data, research, and engineering teams across model training and evaluation workflows
- Participate in synchronous design reviews to iterate on architecture and implementation decisions
Candidate background
Who You Are
- 3–5+ years of professional experience writing production-grade C#
- Strong full-stack developer with a solid systems programming foundation
- Experienced in interoperability scenarios — calling Python ML models from .NET, wrapping native libraries, bridging ecosystems
- Proven track record designing benchmarking harnesses and performance evaluation systems
- Clear, precise written and verbal communicator — you can explain technical decisions to mixed audiences
- Native or fluent English speaker
- Able 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 platforms, data quality pipelines, or evaluation systems
- Familiarity with AI/ML workflows, model training, or benchmarking infrastructure
- Experience with distributed systems or developer tooling
- Background working in fast-moving research or AI-adjacent engineering 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 ↗
Software Engineer (C#) — Internal Tooling (AI Infrastructure)
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 full-stack C# engineer to build the data pipelines, annotation systems, and evaluation tooling that leading AI labs depend on every day.
This isn't toy work or proof-of-concept territory. You'll be writing production code that sits at the heart of real AI training and evaluation workflows — the kind of systems that determine how models learn, improve, and get measured.
- Organization: Alignerr - Type: Hourly Contract - Location: Remote - Commitment: 20–40 hours/week
What You'll Do
* Design and build high-performance C# systems that support large-scale AI data pipelines and evaluation workflows * Develop full-stack tooling and backend services for data annotation, validation, and quality control at scale * Improve reliability, performance, and correctness across existing C# codebases * Build robust benchmarking and evaluation harnesses to measure system behavior * Implement interoperability solutions — such as invoking Python ML models from .NET or wrapping native libraries * Identify bottlenecks and edge cases, then ship scalable, well-reasoned fixes * Collaborate with data, research, and engineering teams across model training and evaluation workflows * Participate in synchronous design reviews to iterate on architecture and implementation decisions
Who You Are
* 3–5+ years of professional experience writing production-grade C# * Strong full-stack developer with a solid systems programming foundation * Experienced in interoperability scenarios — calling Python ML models from .NET, wrapping native libraries, bridging ecosystems * Proven track record designing benchmarking harnesses and performance evaluation systems * Clear, precise written and verbal communicator — you can explain technical decisions to mixed audiences * Native or fluent English speaker * Able to commit 20–40 hours per week consistently
Nice to Have
* Prior experience with data annotation platforms, data quality pipelines, or evaluation systems * Familiarity with AI/ML workflows, model training, or benchmarking infrastructure * Experience with distributed systems or developer tooling * Background working in fast-moving research or AI-adjacent engineering environments
Why Join Us
* Work on real production systems alongside top AI research labs — not toy demos * Fully remote and flexible — structure your hours around your best work * Freelance autonomy with the substance of meaningful, high-stakes engineering * Make a tangible impact on the infrastructure that shapes how next-generation AI models are built and evaluated * Potential for ongoing work and contract extension as projects grow
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
- 05113189-64f6-41b9-ab53-51a6bd968a8a
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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