Job Description

ECS is seeking a Principal Sales Engineer to work in our Arlington, VA office.

We are looking for a Principal Sales Engineer who builds. This is a hands-on, player-coach role at the intersection of pre-sales strategy and solution delivery. You will work directly with new prospects and existing customers to understand their technical challenges, plan engagement approaches, and then roll up your sleeves to design and develop the solutions that win deals and deepen relationships.

The right candidate is equally comfortable leading a whiteboard session with a CTO, writing production-quality prototype code, and planning a multi-phase technical engagement. You bring deep engineering fluency across cloud infrastructure, modern software development, and AI/ML—and you know how to translate that into outcomes that customers can see and touch. You are looking for a role where you are hands on; you want to be in the code, in the architecture, and in the room when it matters.

Qualifications

• 12+ years of progressive experience in sales engineering, solutions architecture, or a comparable customer-facing technical role in enterprise software or cloud services.

• Strong, active software development skills with production experience in at least two of: Python, TypeScript/JavaScript, Go, Java. You should be writing code regularly, not managing people who write code.

• Demonstrated ability to independently design and deliver technical solutions—prototypes, POCs, and reference architectures—under real deal timelines.

• Hands-on cloud architecture expertise in one or more major platforms (AWS, Azure, GCP)

• Working knowledge of AI/ML concepts including large language models, retrieval-augmented generation, vector databases, and model deployment pipelines.

• Track record of supporting complex, six- and seven-figure enterprise engagements across both new logo acquisition and existing customer expansion.

• Exceptional communication skills with proven ability to present to and influence technical and executive audiences alike.

• Bachelor’s degree in Computer Science, Engineering, or a related field (or equivalent practical experience).