Senior Platform Engineer

About Kojo It's time to build. Whether it's creating more housing, upgrading our infrastructure, or adapting to climate change, one thing is clear: the construction industry is at the center of solving our biggest problems. We’re making buildings cheaper and easier to build by transforming the way commercial construction companies buy their materials. Join us. Founded in 2018, Kojo is now one of the fastest-growing construction technology companies in the world. Construction accounts for $10 trillion in global spend annually and we can’t live without its output - our roads, schools, hospitals, and offices. Despite this, there’s been very little innovation over the past 70 years in how materials - which constitute up to 40% of project costs - are bought and sold. This is our opportunity. We're looking for an amazing Senior Platform Engineer who will build the tooling, golden paths, and self-service abstractions that let our product teams move fast - not just operate clusters, but engineer the infrastructure layer itself. About the Role This is a platform engineer, not a traditional SRE. We want a strong software engineer who specializes in infrastructure - someone who builds tooling, golden paths, and self-service abstractions for product teams, not just someone who operates clusters. Hard software engineering skills are the bar; infra and SRE depth is how that bar gets applied. This role will include: IaC repos: typed component resources, factories, multi-env stacks (Pulumi, Terraform) The EKS platform: Karpenter autoscaling, and GitOps delivery via ArgoCD, Kargo, and Helm CI/CD pipelines (GitHub Actions) and release automation Developer-experience tooling and AI-driven development workflows (skills, hooks, MCP servers, managed agents) Observability, network and edge security, and SOC 1 + SOC 2 evidence automations Our Stack AWS + EKS Pulumi (TypeScript) + Terraform Kubernetes ArgoCD + Kargo + Helm GitOps Aurora PostgreSQL + Prisma + Slonik DynamoDB EventBridge + SQS OpenTelemetry + Datadog About You A strong, infrastructure-minded software engineer will thrive in this role! If you're excited about building developer platforms, AI-driven workflows, and rock-solid cloud infrastructure, apply with us! What you’ve accomplished: Strong AWS services knowledge Strong in JavaScript, TypeScript, and Node Solid grasp of parallel programming Deep PostgreSQL and ORM optimization skills (Prisma, Slonik, etc.) Hands-on with NoSQL databases (Redis, DynamoDB, Elasticsearch, etc.) Strong system design and microservice architecture (event-driven, idempotent consumers, fanout, etc.) Experience with message brokers Comfortable with infrastructure as code, any tool works (Terraform, Pulumi, AWS CDK, or similar) Experience building RESTful APIs Production Kubernetes experience, ideally EKS (Karpenter, VPC CNI with NetworkPolicy, managed node groups, multi-cluster) Familiarity with observability standards and tooling, vendor-agnostic (OpenTelemetry, any APM platform) Network segmentation know-how (VPCs, subnetting, security groups, firewall config, DNS, etc.) Edge and network security (CloudFront, WAF, ACM certificates, on top of VPC segmentation) Pipeline configuration, ideally GitHub Actions Strong in AI-driven development (Claude, Codex, Cursor, or similar) and fluent in its building blocks: skills, hooks, custom commands, managed agents, etc. Nice to have: GraphQL or gRPC GitOps with ArgoCD, Kargo, and Helm Certifications (AWS, CNCF, Linux Foundation, etc.) Security tooling (SAST, Software Composition Analysis, IAST, SIEM, threat management) and compliance frameworks like SOC 1 and SOC 2 SRE and reliability practices (SLOs, error budgets, incident response, runbooks, on-call) FinOps and cost management (cost allocation on EKS, right-sizing, Savings Plans) Compliance automation (SOC 2 evidence, IAM Identity Center and permission sets, least-privilege access) What you care about: Customer Obsession: You care deeply about our customers and go the extra mile to delight them Intentional Communication: You have a bias towards written communication and documentation to open up access to your thinking, and you listen with openness and curiosity. Growth: You are excited by problems because they’re opportunities for improvement. Impact: You measure results and are evidence-based. Working at Kojo Salary: Your salary will be dependent upon many factors, including your experience level, skillset, market dynamics and balancing internal equity relative to other Kojo employees. The compensation and benefits information that we provide is based on Kojo’s good-faith estimate as of the date of the job posting and may be modified in the future. Benefits: This position is also eligible for a new hire equity grant and all US-based full time employees are eligible for our full suite of perks and benefits. For more information about our perks and benefits, check out https://www.usekojo.com/careers . Location: Kojo’s team members work from home 100% of the time across North and South America. If applicable, we’ll identify the travel and/or location-specific requirements of a position in the text above. Otherwise, team members can expect to work business hours congruent with their local time zone and remotely. Inclusive Workplace: Kojo values diverse perspectives and is committed to building an inclusive workplace. We are proud to be an equal opportunity workplace and do not discriminate on the basis of sex, race, color, age, sexual orientation, gender identity, religion, national origin, citizenship, marital status, veteran status, or disability status. Pursuant to the San Francisco Fair Chance Ordinance, we consider for employment qualified applicants with arrest and conviction records. We strongly encourage people from underrepresented groups to apply. Scam Notice: Please be aware that there are individuals and organizations that may attempt to scam job seekers by offering fraudulent employment opportunities in the name of Kojo. These scams may involve fake job postings, unsolicited emails, or messages claiming to be from our recruiters or hiring managers. Kojo will never ask for any personal account information, such credit card details or bank account numbers, during the recruitment process.