Platform Engineer - Member of Technical Staff at Callosum
May no longer be active — verify on the employer site
At a glance
- Company
- Callosum
- Location
- United Kingdom
- Work arrangement
- On-site
- Employment type
- Full-time
- Experience
- 5–10 years
- Working hours
- 40 hours
- Visa sponsorship
- Offered, according to the listing
- Posted
- Added to The Stack
✨ The Stack take on this Callosum job
- 🏢 Callosum has 5 jobs here, 5 with visa sponsorship see all
- 🛂 Skilled Worker visa. Standard minimum salary: £41,700 a year guide
- 💡 No salary shown. Ask Callosum if it is above the minimum.
Updated 2026-11-05, from our data and official sources.
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About the role
Responsibilities:
- Implement the metering and billing layer: usage capture, attribution per workflow, and support for consumption- and outcome-based pricing.
- Build workflow deployment machinery: register workflows, route execution, enforce isolation and scaling (including dedicated containers where required).
- Deliver core platform services: request path, rate limiting, quota enforcement, authentication, and other API-level infrastructure.
- Produce client SDKs and integration libraries for primary customer languages.
- Create internal operational tooling: deployment, admin consoles, CI/CD integration, and runbook automation.
- Collaborate with the Lead API Platform Architect and reliability engineer to implement architecture contracts and operate production services.
- Ensure production readiness: observability, testing, performance tuning, and incident response processes.
Requirements:
- Proven backend/production engineering experience building distributed, high-throughput services in production.
- Strong knowledge of concurrency, fault tolerance, multi-tenant SaaS design, and usage metering/billing systems.
- Proficiency in one or more of: Python, Go, Rust and experience with cloud platforms and container orchestration (Kubernetes).
- Experience building SDKs, REST/gRPC APIs, and implementing rate limiting/quota systems.
- Familiarity with observability stacks (Prometheus/Grafana/OpenTelemetry), logging, monitoring, and alerting.
- Competence with CI/CD, IaC, databases, and operational practices for secure, reliable services.
- Good communication skills and experience collaborating across architecture, reliability, and product teams.
Responsibilities
Build the platform's core services, including the metering and billing layer, workflow deployment machinery, and request path infrastructure. Develop client SDKs and internal operational tooling to support a scalable, multi-tenant API product.
Requirements
Requires a strong background in backend or production engineering with deep expertise in distributed systems and high-throughput services. Proficiency in Python, Go, or Rust and experience with SaaS infrastructure like rate limiting and authentication is essential.
Key skills
- Backend Engineering — in 127 other listings on The Stack
- Production Engineering — in 4 other listings on The Stack
- Distributed Systems — in 342 other listings on The Stack
- API Design — in 192 other listings on The Stack
- Concurrency — in 31 other listings on The Stack
- Fault Tolerance — in 10 other listings on The Stack
- Multi-tenant SaaS — in 1 other listing on The Stack
- Usage Metering — in 1 other listing on The Stack
- Billing Infrastructure
- Python
- Go
- Rust
- Cloud Services
- Client SDK Development
- ML Infrastructure
- Observability Tooling
On The Stack (as of 2026-11-05)
Frequently asked questions about Callosum
Is this Platform Engineer - Member of Technical Staff role still open?
It was posted on 2026-06-19. Listings more than 30 days old may no longer be active, so check Callosum 's site before applying.
Does Callosum offer visa sponsorship?
This listing is marked as offering visa sponsorship. Eligibility rules are set by the employer, so check the details on Callosum 's site.
Where is this role located?
The listing gives the location as United Kingdom. It is marked on-site.
What skills does this role ask for?
The listing names: Backend Engineering, Production Engineering, Distributed Systems, API Design, Concurrency, Fault Tolerance, Multi-tenant SaaS, Usage Metering, Billing Infrastructure, Python, Go, Rust, Cloud Services, Client SDK Development, ML Infrastructure, Observability Tooling.