Principal Software Engineer, TS/SCI with Polygraph at Rivermatrix Technologies, Inc.
Annapolis Junction, MD
$160,000–$260,000from the description
Jul 15, 2026
Annapolis Junction, MD
Jul 21, 2026
What this job asks for AI summary
A UX/UI-focused software engineering role centered on modernizing an existing data tracking and metrics system. Day-to-day work involves designing and building end-user interfaces, creating wireframes and interactive prototypes, conducting usability and 508 compliance testing, and collaborating with analysts and engineers to align interfaces with user workflows. Suited to a highly experienced engineer with deep UX expertise and an active TS/SCI clearance with polygraph.
Principal level · 20+ years · National · TS/SCI clearance · Full-time
We read this from the posting text with AI. Skim the description below before ruling yourself out.
How this req sits in the market our data
Most people in this occupation already list these. Still required — just not what gets you shortlisted.
What the occupation pays Median $106,287 (middle half $74,902–$162,313). This posting is about at that midpoint.
Estimated from BLS employment for this occupation and area, per-skill prevalence across our listing corpus, and published wage benchmarks — as of Jul 28, 2026. It is a model, not a headcount.
Why we read it this way (9)
The posting title is 'Software Engineer' but the role is overwhelmingly UX/UI-focused (user-centered design, wireframes, mockups, usability testing, 508 compliance, prototyping). 15-1255 (User Experience Researchers and Designers) is the best fit; 15-1252 (Software Developers) is a plausible runner-up given the title and the coding skills listed.
The 20-year overall experience requirement is unusually high and drives the seniority assessment to Principal, even though the title carries no explicit level label.
A Bachelor's degree in Computer Science or related field is listed as a requirement, but the JD explicitly allows substitution with 4 additional years of SWE experience — so no hard degree gate applies.
CSS, JavaScript, and HTML appear in both the main requirements narrative and the 'Additional Desired Qualifications' section. They are treated as required because they are firmly stated in the requirements body first; their reappearance under 'Desired' is noted but does not change their gate status.
TS/SCI with polygraph is explicitly listed as a required clearance under 'Required Skills'.
The salary range ($160,000–$260,000/year) is explicitly noted as not a guarantee and may vary by education, experience, and geography.
Ignored 1 non-technology phrase(s) as skills (responsibilities/concepts, not named tools): UI/UX design.
SOC 15-1255 is "Web and Digital Interface Designers", but this role was labelled "User Experience Researchers and Designers" — the code and title disagree, so the occupation (and its BLS denominator) may be wrong.
Requires a TS/SCI clearance — the cleared population is a small fraction of this occupation, so the real candidate pool is materially smaller than the estimate below, which does not model clearance.
Read the full posting
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