Calyptus
Founding Platform Engineer
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About this opportunity
This role is being recruited by Calyptus on behalf of one of our clients.
Calyptus is a specialist recruitment partner helping startups and high-growth technology companies hire across engineering, product, and design.
What to expect
- We’ll review your application and, if your experience is a strong match, one of our team will be in touch
- We’ll support you throughout the interview process and keep you updated at each stage
- If this particular role isn’t the right fit, we may consider you for other relevant opportunities with our clients
What you will do
- Build the core of our product across frontend, backend, and data workflows.
- Turn prototype scripts and one-off workflows into reusable product systems.
- Build customer-facing interfaces for querying, exploring, and auditing AI-generated insights.
- Design clear product experiences for complex concepts like evidence, uncertainty, provenance, traces, predictions, and reports.
- Build backend APIs for customer workspaces, data ingestion, workflow execution, auth, and artifact retrieval.
- Design systems for storing source files, runs, outputs, traces, reports, evaluations, and provenance.
- Create internal tools that make customer deployments faster and less manual.
- Own early deployment, observability, reliability, and security foundations.
- Work closely with the Founding AI Engineer to productize AI workflows.
- Work closely with the founders to turn customer pain into product primitives.
- Help define the engineering standards, architecture, and product culture.
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What we are looking for
You may be a strong fit if you have:
- 5+ years of software engineering experience.
- Strong backend skills, ideally Python, FastAPI, or a similar stack.
- Strong frontend and product engineering ability, ideally React, Next.js, TypeScript, or equivalent.
- Good SQL and data modelling instincts.
- Experience building data-heavy, workflow-heavy, or B2B SaaS products.
- Comfort deploying and operating production systems.
- Good product judgment: you care about clarity, speed, reliability, and user trust.
- The ability to move fast without creating unnecessary mess.
- Strong ownership in ambiguous environments.
- Clear communication and a bias toward making complex systems understandable.
Especially relevant experience
We would be particularly interested if you have worked on any of the following:
- Early-stage B2B SaaS products.
- Data products, analytics tools, workflow tools, internal platforms, or AI products.
- Products with file uploads, artifact storage, versioning, lineage, or audit trails.
- Auth, permissions, rate limits, customer workspaces, and deployment pipelines.
- LLM applications, RAG products, AI copilots, or streaming interfaces.
- Polished interfaces for complex analytical or operational workflows.
- High-reliability products where customer trust depended on transparency and correctness.
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Technical areas
You do not need to know all of these, but the role will touch many of them:
- Python, FastAPI, Pydantic
- React, Next.js, TypeScript
- Postgres and SQL
- Object storage and artifact management
- Background jobs, queues, and workflow orchestration
- Auth, permissions, rate limiting
- Observability, logs, tracing
- Vercel, Railway, Render, Fly, AWS, GCP, or similar
- LLM APIs, streaming responses, embeddings, and vector search
- Data import/export workflows
Genuine opportunities
Every role advertised by Calyptus is a live position we’re actively recruiting for. Some clients prefer to remain confidential during the early stages of the hiring process. When that’s the case, certain company details may be shared later in the process.
Why work with Calyptus?
- Access opportunities with ambitious startups and high-growth technology companies
- Direct support from experienced specialist recruiters
- Honest feedback and clear communication throughout the hiring process
- Long-term career support, not just a single job application
We look forward to hearing from you.
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