Full Stack Engineer, AI Systems

BJAK

Full Stack Engineer developing AI systems and workflows for improved productivity. Collaborating with teams to integrate LLM and design reliable user experiences.

Posted 7/19/2026full-timeRemote • 🇪🇸 SpainMid-LevelSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in full stack engineering, integrating LLMs and AI-powered applications while ensuring system reliability and effective API architecture. Capable of collaborating with cross-functional teams to deliver end-to-end product features in dynamic environments.

Highest-signal resume keywords

Full Stack EngineeringSystem DesignAPI ArchitectureLLMs IntegrationFeature Ownership

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Frontend DevelopmentBackend DevelopmentAI IntegrationSystem ReliabilityObservabilityReal-Time InteractionsStreaming DataFailure RecoveryPragmatic Engineering DecisionsIterative Development

Soft Skills

CollaborationAdaptabilityProblem-Solving

Industry Keywords

AI-Powered ApplicationsRAG SystemsAgent WorkflowsReal-World ConditionsEvolving Requirements

About the role

Key responsibilities & impact

Build end-to-end product features across frontend, backend, and AI integrations
Design agent workflows that handle planning, tool use, failure, and recovery across multiple steps.
Integrate LLMs, memory, and external tools into systems that behave reliably under real-world conditions
Design real-time AI interactions with streaming, partial results, and tight latency constraints
Improve system reliability, observability, and fallback mechanisms
Collaborate closely with ML, backend, and product teams to ship features end-to-end
Continuously iterate based on real usage and failure modes

Requirements

What you’ll need

Strong experience in full stack engineering (frontend + backend)
Solid understanding of system design and API architecture
Experience working with LLMs, RAG systems, or AI-powered applications
Ability to handle ambiguity and make pragmatic engineering decisions
Strong ownership - able to take features from idea to production
Comfort working in fast-moving environments with evolving requirements

Benefits

Comp & perks

Health insurance
401(k) matching
Flexible work hours
Paid time off
Remote work options