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Cast AI

Senior Software Engineer – Product Foundations

Cast AI

. Design, build, and operate backend services in Go that teams and customers depend on .

Posted 11/4/2026full-timeRemote • CroatiaSenior💰 €6,500 - €9,000 per monthWebsite

Core Competencies

Role fit
Core Competencies

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Demonstrates expertise in designing and operating backend services using Go, with a strong focus on authentication, authorization, and trust-critical systems. Proven ability to debug complex production issues and optimize high-load systems while collaborating effectively with cross-functional teams.

Highest-signal resume keywords
Go ProgrammingTrust-Critical SystemsAPI Design Best PracticesKubernetes ExperienceDebugging and Performance Tuning

ATS Keywords

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Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills
Software Engineering FundamentalsSystems ProgrammingAuthentication and AuthorizationBilling SystemsDatabase Performance TuningHigh-Load Systems OptimizationAsynchronous PatternsComplex Project ManagementClean AbstractionsArchitectural Reasoning
Soft Skills
Strong Verbal and Written English SkillsAdaptableProactiveComfortable with Ambiguity
Tools & Technologies
KubernetesAWSGCPAzurePrometheusGrafanaOpenTelemetryCI/CDDevOpsAI Coding Agents
Industry Keywords
Multi-Tenant Identity System DesignSAMLOIDCSCIMHigh-Cardinality Time-Series SystemsSpot Instance AvailabilityFeature FlagsAudit TrailsNotificationsCloud Pricing

Tech Stack

Tools & technologies
AWSAzureCloudGoogle Cloud PlatformGrafanaKubernetesPrometheusGo

About the role

Key responsibilities & impact
  • Design, build, and operate backend services in Go that teams and customers depend on
  • Own features end-to-end from design through implementation, testing, and production rollout
  • Debug complex production issues involving security-, money-, or trust-critical flows
  • Collaborate with product and engineering teams on problems without textbook solutions
  • Contribute to product direction and backlog, shaping what gets built next
  • Work on authentication, authorization, SSO, billing, audit trails, notifications, feature flags, cloud pricing, Spot availability, and reporting systems

Requirements

What you’ll need
  • Strong software engineering fundamentals, including clean abstractions, maintainable code, and architectural reasoning
  • Production experience with Go strongly preferred; comparable strong systems programming skills accepted without Go
  • Experience building or operating trust-critical systems at scale, such as authentication/authorization, billing, or financial/accounting-adjacent data
  • Understanding of API design best practices, including versioning, backward compatibility, authentication, idempotency, and asynchronous patterns
  • Strong debugging, optimization, and performance-tuning skills, including query profiling, index design, and database performance tuning beyond ORM usage
  • Experience operating and optimizing high-load systems
  • Hands-on Kubernetes experience, including pods, services, deployments, and deploying or debugging on a cluster
  • Experience with AI coding agents and agentic development workflows
  • Personally driven a complex project end-to-end
  • Strong verbal and written English skills
  • Startup mindset; adaptable, proactive, and comfortable with ambiguity
  • Participation in on-call rotation for teams that require it
  • No visa sponsorship or work permit provided
  • Nice to have: multi-tenant identity system design; SAML, OIDC, and SCIM; billing, audit-trail, notification, or feature-flag systems; AWS, GCP, or Azure pricing/billing APIs; Spot instance availability; high-cardinality time-series systems; Kubernetes internals; CI/CD and DevOps; Prometheus, Grafana, OpenTelemetry

Benefits

Comp & perks
  • Separate compensation for on-call participation (passive coverage and active interventions)
  • Flexible, remote-first global environment
  • Equity options
  • 10% of work time for personal projects or self-improvement
  • Learning budget for professional and personal development, including international conferences and courses
  • Annual hackathon
  • Team-building budget and company events
  • Equipment budget
  • Extra days off
  • Company-covered travel costs to Vilnius for onboarding