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Core Competencies
Role fitCore Competencies
Use this summary to align your resume positioning with the role.
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 systems under high load while collaborating effectively with cross-functional teams.
Highest-signal resume keywords
Go ProgrammingTrust-Critical SystemsAPI Design Best PracticesKubernetes ExperienceDebugging and Performance Tuning
ATS Keywords
Tailor your resumeApplicant 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 TuningQuery ProfilingIndex DesignAsynchronous PatternsFeature FlagsCloud Pricing
Soft Skills
Strong Verbal and Written English SkillsAdaptableProactiveComfortable with Ambiguity
Tools & Technologies
KubernetesAI Coding Agents
Industry Keywords
Production ExperienceOn-Call RotationStartup MindsetBackground Check
Tech Stack
Tools & technologiesCloudKubernetesGo
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
- Work on authentication, authorization, SSO, billing, audit trails, notifications, feature flags, cloud pricing, Spot availability and discounts, and reporting systems
- Participate in on-call rotation where required
Requirements
What you’ll need- Strong software engineering fundamentals, including clean abstractions, maintainable code, and justified architecture choices
- Production experience with Go is strongly preferred; candidates without Go should demonstrate strong systems programming skills in a comparable language
- 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 systems under high load
- 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
- Willingness to participate in on-call rotation for teams that require it
- Background check may be conducted at the final recruitment stage
- Must be residing in one of the specified European countries
- Cast AI does not provide visa sponsorship or work permits
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
- Travel costs covered for Vilnius onboarding