Senior Software Engineer – Product Foundations

This is a fully remote position, open to applicants in Lithuania.

📋 Description

• Design, develop, and maintain backend services in Go that are relied upon by teams and clients.

• Take full ownership of features from initial design through implementation, testing, and deployment in production.

• Resolve complex production challenges related to security-sensitive, financial, or trust-dependent processes.

• Work collaboratively with product and engineering teams to tackle problems that lack standard solutions.

• Influence product strategy and manage the backlog effectively.

• Engage in work involving authentication, authorization, SSO, billing, audit trails, notifications, feature flags, cloud pricing, Spot availability and discounts, as well as reporting systems.

• Take part in on-call rotations when necessary.

⛳️ Requirements

• Strong foundation in software engineering principles, including clean abstractions, maintainable code, and well-justified architectural decisions.

• Preferably have production experience with Go; candidates proficient in a similar systems programming language are also encouraged to apply.

• Proven experience in building or managing trust-critical systems at scale, such as authentication/authorization, billing, or financial/accounting-related data.

• Familiarity with API design best practices, encompassing versioning, backward compatibility, authentication, idempotency, and asynchronous patterns.

• Excellent debugging, optimization, and performance tuning abilities, with skills in query profiling, index design, and database performance tuning beyond ORM usage.

• Experience in operating and optimizing systems under high demand.

• Practical experience with Kubernetes, including pods, services, deployments, and troubleshooting within a cluster.

• Familiarity with AI coding agents and agentic development workflows.

• Successfully driven a complex project from start to finish.

• Strong verbal and written communication skills in English.

• Possess a startup mindset; adaptable, proactive, and comfortable navigating ambiguity.

• Willing to engage in on-call rotations for necessary teams.

• A background check may be performed during the final recruitment stage.

• Must be residing in one of the designated European countries.

• Cast AI does not offer visa sponsorship or work permits.

🏝️ Benefits

• Additional compensation for on-call participation (both passive coverage and active interventions).

• A flexible, remote-first global work environment.

• Opportunities for equity options.

• 10% of work time allocated for personal projects or self-improvement.

• A learning budget for professional and personal development, including international conferences and courses.

• Annual hackathon event.

• Team-building budget and company-sponsored events.

• Budget for equipment.

• Extra paid time off.

• Travel expenses covered for onboarding in Vilnius.