Senior Platform Engineer

📋 Job Overview

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.

🏢 About Kojo

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.

🎯 The Role

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.

✅ Key Responsibilities

• 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

📌 Required Qualifications

• 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.

⭐ Desirable Experience

• 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)

🎁 Benefits

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.

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.

🛂 Visa & Eligibility

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.

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.