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 mastery of C++ could directly shape the infrastructure powering the world's most advanced AI systems? We're looking for a Senior C++ Full-Stack Engineer to build and optimize the data pipelines, annotation tooling, and evaluation systems that leading AI labs depend on — working on real production code with genuine, measurable impact.
What you'll do
- Design, build, and optimize high-performance C++ systems supporting large-scale AI data pipelines and evaluation workflows
- Develop full-stack tooling and backend services for data annotation, validation, and quality control
- Improve reliability, performance, and safety across production C++ codebases
Show all 6 itemsHide the other 3 in What you'll do
- Identify and resolve bottlenecks and edge cases in data and system behavior — then ship scalable 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
Candidate background
Who You Are
- 3–5+ years of professional experience writing production-grade C++, with a strong focus on modern standards (C++17 or C++20)
- Deep systems programming background — you're comfortable with performance optimization, concurrency (threading, atomics), and memory safety (RAII, smart pointers, sanitizers)
- Full-stack developer with experience across backend services and tooling, not just low-level systems
- Clear, confident communicator — written and verbal — who can engage effectively with cross-functional teams
- Native or fluent English speaker
- 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 systems, data quality pipelines, or evaluation infrastructure
- Familiarity with AI/ML workflows, model training, or benchmarking systems
- Experience with distributed systems or developer tooling at scale
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 mastery of C++ could directly shape the infrastructure powering the world's most advanced AI systems? We're looking for a Senior C++ Full-Stack Engineer to build and optimize the data pipelines, annotation tooling, and evaluation systems that leading AI labs depend on — working on real production code with genuine, measurable impact.
This is a fully remote, flexible contract role for a seasoned systems engineer who wants to do meaningful work 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 C++ systems supporting large-scale AI data pipelines and evaluation workflows * Develop full-stack tooling and backend services for data annotation, validation, and quality control * Improve reliability, performance, and safety across production C++ codebases * Identify and resolve bottlenecks and edge cases in data and system behavior — then ship scalable 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
* 3–5+ years of professional experience writing production-grade C++, with a strong focus on modern standards (C++17 or C++20) * Deep systems programming background — you're comfortable with performance optimization, concurrency (threading, atomics), and memory safety (RAII, smart pointers, sanitizers) * Full-stack developer with experience across backend services and tooling, not just low-level systems * Clear, confident communicator — written and verbal — who can engage effectively with cross-functional teams * Native or fluent English speaker * Able to commit 20–40 hours per week consistently
Nice to Have
* Prior experience with data annotation systems, data quality pipelines, or evaluation infrastructure * Familiarity with AI/ML workflows, model training, or benchmarking systems * Experience with distributed systems or developer tooling at scale
Why Join Us
* Work directly with leading AI labs on production systems that matter * Fully remote and flexible — work when and where it suits you * Freelance autonomy with the structure of impactful, high-caliber engineering work * Collaborate with top technical experts across data, research, and infrastructure * 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 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
- 28c6791d-e3fb-472d-ac2b-efab3186ab33
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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