Senior Backend Engineer
HumanSignal
- London, England, United Kingdom
- London, England, United Kingdom
Über
At HumanSignal, we’re building the platform that powers the creation, curation, and evaluation of that data. From fine-tuning foundation models to validating agent behaviors in production, our tools are used by leading AI teams to ensure models are grounded in real-world signal, not noise.
Our open-source product, Label Studio , has become the de facto standard
for labeling and evaluating data across modalities — from text and images to time series and agents‑in‑environments. With over 250,000 users and hundreds of millions of labeled samples, it’s the most widely adopted OSS solution for teams working on building AI systems.
Label Studio Enterprise
builds on that traction with the security, collaboration, and scalability features needed to support mission‑critical AI pipelines — powering everything from model training datasets to eval test sets to continuous feedback loops. We started before foundation models were mainstream, and we’re doubling down now that AI is eating the world. If you're excited to help leading AI teams build smarter, more accurate systems — we’d love to talk.
This is a product‑engineering role:
not “build what you’re told,” but
shape what we build —own the problem, propose solutions, and ship outcomes that matter to users and the business.
About the role We’re hiring a
Senior Backend Engineer with product vision . You’ll design and operate services in
Python/Django
that power labeling and
evaluation
workflows at scale: clean API contracts, robust data models, efficient background jobs, and dependable performance. You’ll partner early with PM/Design/FE to frame problems, prototype to learn, and make pragmatic scope calls—so complex workflows feel
simple ,
reliable , and
fast
for users.
Responsibilities
Design, build, and operate backend services/APIs in
Python/Django
with
Postgres/Redis .
Own outcomes, not tasks:
refine scope, suggest trade-offs, and land increments that deliver value quickly and safely.
Model data and author migrations; tune queries and caching; manage
background jobs/queues
for high-volume workflows.
Evolve API contracts with FE; keep interfaces clear, versioned, and resilient to change.
Improve reliability and performance (timeouts, retries, idempotency, rate limits, pagination, backpressure).
Implement secure, multi‑tenant patterns: auth, permissions/RBAC, auditability, and safe data boundaries.
Contribute to testing strategy (unit/integration), error handling, and graceful failure modes.
Partner with
Support
to investigate production issues and turn learnings into fixes and prevention.
Engage with our
open‑source community
(issues, discussions) to understand real‑world needs and improve developer experience.
Participate in architecture discussions and code reviews; mentor teammates and improve patterns across the codebase.
What you’ll bring
Senior‑level experience shipping production backends in
Python/Django
(or a close equivalent) and
SQL .
Strong
product sense : you’ve made scope/trade‑off decisions and iterated based on real‑world usage and feedback.
Depth in REST API design, relational modeling, migrations, and performance tuning.
Experience with
background processing/queues
(e.g., Celery/RQ/Kafka‑backed workers) and operational concerns.
Clear written communication at a Senior IC level—concise RFCs/PRDs, actionable reviews, and crisp decision records.
Nice to have:
GraphQL familiarity; Kafka/streaming; Spark/BigQuery; security/compliance exposure; multi‑region architectures.
How we build Trunk‑based development with small, reviewable PRs; feature flags for safe rollouts; strong code reviews; pragmatic testing; and close collaboration with Product/Design/Support.
How we work At HumanSignal, we follow a six‑week cycle known as "Build and Ship" followed by a "Cooldown." During the first four weeks, the team focuses on creating new features and shipping improvements. We also rotate a small group to handle customer support, ensuring everyone stays in touch with real user needs and we can respond quickly to issues.
After those four weeks, we have a two‑week "Cooldown" period. This is when we tackle technical debt, refine our integration processes, and wrap up those lingering tasks that never quite fit into regular sprints but really help us feel good about our codebase and workflows.
Location & Compensation At HumanSignal we pay based on regional compensation market rate ranges across the globe. We are hiring for this role across North and South America as well as Europe. The base cash compensation range is $140,000 to $200,000 USD. These ranges are provided by market data and are in good faith. The final offer details are determined by several factors including candidate experience, expertise, as well as applicable industry knowledge and may vary from the pay ranges listed above.
It’s an exciting time at HumanSignal.
We’re growing quickly, and roles evolve as we learn. We’ve put thought into your first initiatives, but we’ll refine them together. If this sounds exciting, come build with us.
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Sprachkenntnisse
- English
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