LLM Applications Engineer — Build Reliable AI Workflows

ActAI; Sweden; On-site; SEK 900,000 - 1,200,000; Full time

Job summary

ActAI is seeking an LLM Application Engineer to build the intelligence layer powering its AI experiences. You will work at the intersection of LLMs, software engineering, and product—designing agent workflows, improving model behaviour, and turning AI capabilities into reliable user experiences.

You will own problems end-to-end, from understanding user needs to integrating models and tools, building evaluation systems and continuously improving AI behaviour in production.

Qualifications

• Strong software engineering fundamentals.
• Hands-on experience with LLMs or agent-based systems.
• Experience designing prompts, workflows, evaluations, or AI behaviour.
• Ability to write clean, production-quality code.

Responsibilities

• Build and ship LLM-powered applications and AI agent workflows.
• Design systems for reasoning, planning, memory, tool use and multi-step execution.
• Build reliable orchestration pipelines that turn probabilistic model outputs into predictable, observable actions.
• Integrate LLMs with APIs, databases, search, internal services, and external tools.
• Develop prompting, context engineering, structured outputs, tool-calling, and other techniques to improve model behaviour.
• Build evaluation frameworks and datasets to measure AI quality, reliability, and regressions.
• Debug AI systems across the entire stack—from model behaviour and prompts to orchestration, backend services, and product UX.
• Optimise AI systems for quality, latency, and cost.
• Work closely with product and engineering teams to turn ambiguous product problems into working AI solutions.
• Establish production practices for observability, tracing, experimentation, evaluation, and continuous improvement

Skills

Software engineering

LLMs / AI

Prompt design

Production code

Cross-layer work

Problem solving

Shipping mindset

Tools

Python

LLM APIs

Agent frameworks

Vector databases

PyTorch/JAX

Job description

ActAI is seeking an LLM Application Engineer to build the intelligence layer powering its AI experiences. You will work at the intersection of LLMs, software engineering, and product—designing agent workflows, improving model behaviour, and turning AI capabilities into reliable user experiences.

You will own problems end-to-end, from understanding user needs to integrating models and tools, building evaluation systems and continuously improving AI behaviour in production.