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Open nowPosted 6 days ago

Sr. Platform Engineer

OneDome24 open roles

Where
Ukraine, Remote
Work mode
Remote
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Your applicationOpen nowSr. Platform EngineerOneDome · Ukraine, Remote

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The clock on this job

Early applications get read.

8.1% of postings close within 7 days. Measured by our own scanner across the market.

Share of postings closed within
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  2. 3.6%3 days
  3. 8.1%7 days
  4. 15.1%14 days
  5. 34.0%30 days
This job: posted 6 days ago

The posting

About Onedome

We're a UK fintech building high-throughput digital infrastructure for the mortgage and property space. Recently acquired Trussle. We're taking our platform to the next level: fully automated, self-healing, observable, and built to handle real traffic spikes (we have a TV launch coming up).

The role

You'll be our senior platform engineer. Not a traditional ops role. You'll treat infrastructure as a product, build the internal developer platform our engineers deploy through, and bring SRE discipline into the application tier when it's needed.

You won't have a platform team to lean on. You'll be building that capability. We know exactly what we need.

What you'll do

  • Own 5 AWS accounts across the organisation (QA, Prod, Infra, plus two others)
  • Architect and maintain infrastructure as code with Terraform. Replace the click-ops that's still around
  • Stand up CI/CD pipelines engineers actually want to use. Blue/green and canary where it makes sense
  • Run releases reliably and reduce key-person risk on the deploy process
  • Set up monitoring, alerting, and incident response so we catch issues before customers do. Define SLIs and SLOs that map to real user journeys
  • Lead incident response as the primary infra responder. Run blameless post-mortems
  • Patch and harden the platform. We're a fintech, this matters. IAM least privilege, secrets management, vulnerability scanning, MFA enforcement
  • Lead infrastructure work for the TV launch: traffic spikes, autoscaling, capacity planning, runbooks
  • Partner with backend engineers when production issues cross into the app tier. JVM tuning, connection pools, async patterns, memory leaks
  • Architect multi-region DR. Drive the platform toward self-healing
  • Optimise cost across DynamoDB, Lambda, and the wider AWS footprint
  • Set architectural guardrails with tech leads and SWEs. Mentor engineers as the platform capability grows

You must have

  • 6+ years hands-on AWS in production (VPC, IAM, EC2/ECS/EKS, Lambda, S3, CloudFront, Route53, RDS, DynamoDB, SQS)
  • Production Terraform (Terragrunt a plus). Multi-environment state management
  • Production Kubernetes and Docker. EKS specifically
  • Strong CI/CD experience: GitHub Actions, GitLab, Jenkins, or ArgoCD. GitOps practices
  • Strong infrastructure security: IAM least privilege, secrets, patching, vulnerability scanning, MFA enforcement
  • Observability from scratch: CloudWatch, Datadog, Grafana, Prometheus, OpenTelemetry, or ELK
  • Solid backend competency in Java (Spring Boot), Python, or Node. Understanding of JVM, concurrency, async systems
  • Comfort being the senior infrastructure person. Self-directed, opinionated, disciplined about documentation
  • B2/C1 Level English

Nice to have

  • Fintech or other regulated industry experience
  • DynamoDB at scale (we run many tables with PITR and S3 exports, Lambda-driven daily incrementals)
  • AWS cost optimisation track record
  • Past experience as a first infrastructure hire at a small team
  • Building internal developer platforms or self-service tooling
  • AWS DevOps Pro, Solutions Architect Pro, or CKA
  • Service mesh experience (Istio, Linkerd) and DevSecOps practices
  • Firebase or GCP exposure (we have a small footprint there)

What you won't get from us

  • A platform team to lean on. You'll be building that capability
  • Click-ops everywhere. You'll be replacing what exists with IaC
  • Ambiguity about the work. We know exactly what we need

Working setup

  • UK working hours.
  • Fully remote across the EU
  • Tooling: Microsoft 365, Teams, Planner, Nuclino, GitHub
  • aws-vault with MFA enforcement on all accounts
  • Sustainable on-call rotation
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