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LLM Application Engineer

bjakcareerSpainActAI Engineering
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Salary
Not listed
Job type
Full-time
Work mode
Remote
Experience
Mid
Posted
28 Sept 2026
Status
Open · checked 7d ago

About this role

This position suits a software engineer with strong fundamentals who wants to build proactive AI applications for global users. The LLM Application Engineer role is based in Spain and involves designing the intelligence layer that drives ActAI products.

Role Overview

As an LLM Application Engineer at ActAI, the professional joins a team focused on transforming standard applications into AI-native tools with minimal prompting required. The work centers on the intersection of product design, software engineering, and large language models to deliver reliable, long-running workflows and real-world task completion.

Key Responsibilities

Build and ship applications powered by large language models and agent workflows.
Design reasoning, planning, memory, multi-step execution, and tool use systems.
Create orchestration pipelines that convert probabilistic model outputs into safe, observable, and predictable actions.
Connect models with search engines, databases, internal services, external tools, and APIs.
Implement context engineering, prompting, structured outputs, and tool-calling methods to refine model behavior.
Establish evaluation frameworks and datasets for measuring AI quality, reliability, and regressions.
Troubleshoot artificial intelligence systems across the full stack, covering models, prompts, product user experience, orchestration, and backend services.
Balance AI systems for cost, latency, and quality while collaborating with engineering and product teams.

Requirements

Solid software engineering background with practical experience in creating AI-driven applications.
Direct involvement with generative AI, large language models, or agent-based architectures.
Experience working with AI behavior, evaluation, prompt design, and workflows.
Capacity to produce clean code suitable for production environments.
Capability to navigate across model, system, and product abstraction layers.

Skills and Tools

Python
OpenAI-compatible APIs, open-weight models, and other LLM model providers
Agent frameworks and orchestration systems
Vector databases and retrieval systems
Backend services, distributed systems, and APIs
PyTorch and JAX

About the Company

ActAI develops proactive applications designed for a global user base that does not rely on complex prompting. The company focuses on bringing intelligence to workflows, conversations, errands, and organizing tasks while minimizing hallucinations and achieving high reliability in long-running processes.

How to Apply

Interested candidates should submit their application directly on the official company careers page.

Skills and tech stack

PythonOpenAI-compatible APIsOpen-weight modelsAgent frameworksOrchestration systemsVector databasesRetrieval systemsBackend servicesAPIsDistributed systemsPyTorchJAXLLMLLMsGenerative AIDistributed Systems

Questions candidates ask

Where is the LLM Application Engineer position located?

The position is located in Spain.

What is the primary mission of ActAI?

ActAI builds proactive applications for users worldwide, bringing intelligence to workflows, conversations, and organization with minimal or no prompting.

What technologies and frameworks are used in the tech stack?

The tech stack includes Python, OpenAI-compatible APIs, open-weight models, agent frameworks, orchestration systems, vector databases, retrieval systems, backend services, distributed systems, PyTorch, and JAX.

What are the core focus areas for this role?

The role focuses on building LLM applications, designing agent workflows, creating reliable orchestration pipelines, integrating models with tools and databases, developing evaluation frameworks, and optimizing systems for quality, latency, and cost.

How should candidates apply for this job?

Candidates must apply on the official company careers page.

Ready to apply?

The application is on the official bjakcareer careers page.

Apply on company site