Staff Full Stack Engineer

Immersum; España; On-site; EUR 90,000 - 140,000; Full time

Job summary

Immersum is seeking a Staff Full Stack Engineer to lead technical vision, architectural design, and execution across systems powering its energy-tech platform. You will build scalable backend infrastructure and deploy agentic workflows to accelerate growth.

Key focus areas include Python-based services, AWS serverless architecture, and complex integration-heavy designs. You will thrive in a fast-paced, ambiguous startup environment and mentor junior engineers as the team scales.

Qualifications

• Proven track record as a Senior or Staff Engineer in a high-growth product organisation.
• Deep expertise in Python and AWS server-less architecture.
• Strong background in complex, integration-heavy system design.
• Ability to thrive in fast-paced, high-ambiguity environments.

Responsibilities

• You will build high-impact backend infrastructure.
• Deploy agentic workflows.

Skills

Python

AWS serverless

System design

Leadership

Job description

About the Role

Working with a Series B Tech startup within energy industry. We are looking for a Staff Full Stack Engineer to lead technical vision, architectural design, and execution across systems driving their expansion. You will build high-impact backend infrastructure, automate tendering workflows, design deal-gating risk tooling, and deploy agentic workflows.

Responsibilities

• You will build high-impact backend infrastructure.
• Deploy agentic workflows.

Required Skills

• Proven track record as a Senior or Staff Engineer in a high-growth product organisation.
• Deep expertise in Python and AWS server-less architecture.
• Strong background in complex, integration-heavy system design.
• Ability to thrive in fast-paced, high-ambiguity environments.

Preferred Skills

• Bonus: Background in climate tech, renewable energy, fintech, or 0-to-1 product launches.