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Software Engineer - Simulation - Hybrid - Relocation Assistance Available
Insitu inc
Bingen, WA
Added 1 min ago
RF Communication Engineer II - Blue National Security (Top Secret Clearance requ
Blue Origin LLC
Seattle, WA
We're looking for a sharp RF engineer with a foundation in satellite communications and systems engineering who thrives in a fast-paced environment and isn't afraid to lead.
Added 1 min ago
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Principal Software Engineer, AI Compute Infrastructure
ARM
Seattle, WA
- $262,700 USD / year
As a Principal Engineer on the AI Compute Infra team, you will design, build, and operate large-scale infrastructure for AI training, fine-tuning, evaluation, and inference. You will guide…
Added 1 min ago
Principal AI Engineer - Blue Ring
Blue Origin LLC
Seattle, WA
We are seeking a Principal AI Engineer to join the Blue Ring software team. You will lead the development of AI and machine learning capabilities embedded in Blue Ring's ground system,…
Added 1 min ago
Software Engineer III
American Express
Phoenix, AZ
Added 3 mins ago
EG
Software Engineer - Emerging Technologies
Eliassen Group
Saint Louis, MO
- $50 to $60 USD / hour
Our client seeks a Software Engineer to join an Emerging Technologies team focused on innovative retail solutions. The role will contribute to projects involving in-store robotics,…
Added 3 mins ago
Sr Data Scientist
UST Global Inc
Bellevue, WA
Architect Agentic Systems: Engineer sophisticated multi-agent orchestrations, autonomous reasoning loops, and tool-calling workflows that integrate advanced RAG for complex, multi-step…
Added 3 mins ago
Staff AI Research Engineer
Duolingo
NY · Pittsburgh, PA
We are looking for an experienced AI Research Engineer to join our Speech team. The ideal candidate will have a proven track record as an AI research engineer, with experience across…
Added 3 mins ago
PT
Lead Splunk Engineer
Platinum Technologies
NM
- $160,000 to $170,000 USD / year
Platinum Technologies currently has an opportunity for an AIOps Engineer SME to lead the design, deployment, and management of AIOps solutions supporting mission-critical IT operations.…
Added 4 mins ago
Software Development Engineer I or II
Cambia Health Solutions
Vancouver, WA
Software Development Engineer I or II (Customer Acquisition)
Added 4 mins ago
Software Development Engineer I or II
Cambia Health Solutions
Burlington, WA
Software Development Engineer I or II (Customer Acquisition)
Added 4 mins ago
Software Development Engineer I or II
Cambia Health Solutions
Renton, WA
Software Development Engineer I or II (Customer Acquisition)
Added 6 mins ago
Machine Learning Engineer
ADP
Alpharetta, GA
ADP Technology Services, Inc. is hiring a Machine Learning Engineer in our Alpharetta, Georgia location.
Added 7 mins ago
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ICT Designer (Fully Remote)
Actalent
Seattle, WA
- $55 to $72 USD / hour
ICT Designer / ICT Engineer (Mission Critical & Data Centers)
Added 7 mins ago
A
Embedded Software Engineer
Actalent
Phoenix, AZ
- $50 to $65 USD / hour
Added 7 mins ago
A
Embedded Software Engineer
Actalent
Phoenix, AZ
- $50 to $60 USD / hour
Job Title: Embedded Software EngineerJob DescriptionWe are seeking an Embedded Software Engineer to develop and maintain embedded software for Flight Management System (FMS) applications.…
Added 7 mins ago
Electrical Engineer
Actalent
Bridgeton, MO
Job Title: Electrical Engineer Power SystemsJob DescriptionThis Electrical Engineer role serves as the Power Systems subject matter expert, responsible for reviewing customer specifications…
Added 7 mins ago
AI Solution Deployment Engineer
FlightSafety International Inc
Seattle, WA
As a Lead AI Solutions Delivery Engineer, you will be on the front lines, embedded directly with strategic enterprise customers to solve complex business problems using Docusign's…
Added 7 mins ago
GTM Business Process Manager
FlightSafety International Inc
Seattle, WA
Develop and design Process Architecture, focusing on end-to-end business design and structural integrity to re-engineer or reimagine business process to transform utilizing AI
Added 7 mins ago
AI Agentic Engineer
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Seattle, WA
As an AI Agentic Engineer on the Platform AI Engineering team, you will drive the next wave of automation in IT operations by designing and deploying agentic AI solutions that proactively…
Added 7 mins ago
Lead Software Engineer, Front-End Engineering
TCC Toyota Motor Credit Corporation Company
Plano, TX
…for millions of customers worldwide. We're looking for a Lead Engineer - an individual contributor who brings strong front-end expertise, solid full-stack instincts, and the technical…
Added 8 mins ago
MG
Software Engineering Intern for QA
METER Group, Inc. USA
Pullman, WA
- $18 to $23 USD / hour
…automated test scripts under the supervision of a senior software engineer. A successful candidate gains valuable work experience while interacting closely with METER's cross-disciplinary…
Added 8 mins ago
Senior Engineer - Semantic &
Cambia Health Solutions
Burlington, WA
Senior Engineer - Semantic & Agentic Intelligence
Added 8 mins ago
Systems Administrator – Linux
Electrosoft
Atlanta, GA
…Server Hybrid Administrator Associate”, "Red Hat Certified Engineer (RHCE)", "VMware Certified Professional - Data Center Virtualization 2024 [v2] (VCP-DCV 2024)”, or higher IT/InfoSec…
Added 8 mins ago
Staff Forward Deployed Engineer
JLL
Seattle, WA
As a Staff Forward Deployed Engineer, you will operate at the front lines of innovation - embedded directly with multiple cross-functional teams to rapidly design, architect, prototype, and…

Lumbra

Frontend Engineer, Core Platform

Arlington, VA, United States

$120,000 to $300,000 USD / year

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Job details

Pay: $120,000 to $300,000 USD / year
Posting language: English
Posted: Nov 4, 2026

Original job description

About Lumbra

Lumbra builds the vendor-neutral operating system for agentic AI in high-consequence environments. In our first ten months we won four fully competed prime contracts across the U.S. Government, every one of them deploying into classified spaces. We are live on JWICS. We were selected from a field of 200+ companies for a defense innovation challenge and won it. We beat two established defense primes on the same program and earned the follow-on, now in execution.

About the Role

Nebula, our agentic harness, turns days of manual synthesis into minutes of analysis. Whether analysts trust it depends heavily on the interface: how an agent's work streams in, how its sources and reasoning are shown, and how quickly someone can move through dense, connected data under pressure.

We want a frontend engineer to own that experience. You build the React and TypeScript application analysts use every day, make it fast and legible, and make sure it works the same in commercial cloud and on disconnected, classified networks.

This role is on site in Arlington, Virginia. It is not eligible for remote or hybrid work.

How the Role Is Structured

~70% building. Product features in React and TypeScript, from conversation interfaces to workflow and graph views.
~20% quality and performance. Testing, render performance, accessibility, and the shared components the rest of the team builds on.
~10% users and product. Working with Forward Deployed Engineers and analysts to turn feedback from the field into interface changes.

What You'll Own

Conversation and streaming interfaces for agent output, including tool calls, citations, confidence, and long-running work that has to recover cleanly from timeouts and reconnects.
Workflow and knowledge-graph visualization that keeps dense analytical data legible.
Front-end architecture: state management, data fetching, API contracts with the backend, and patterns that survive constant change.
Shared components and the design system in code, so new features look and behave consistently.
Performance and accessibility, measured rather than assumed. You profile before guessing and treat slowness as a defect.
Front-end testing: component, integration, and end-to-end tests that cover the spec rather than the implementation.
Builds that work disconnected, with no reliance on external CDNs, fonts, or services, so the same app runs inside air-gapped deployments.

You'll Work Alongside

CIA officers, MIT engineers, Special Operations combat veterans, and applied AI engineers from frontier labs including Anthropic and Google. You will make decisions that immediately affect national security. You will own part of a company early and when it matters.

What This Role Is Not

A pixel-pushing role. You shape the experience, not just implement mockups.
A role where performance is someone else's problem.
A backend role. You'll read and shape API contracts, but your depth is the front end.

Required Qualifications

Real depth shipping production front-end software in React and TypeScript. We care about what you have owned and the depth of your experience, not a year count; engineers with 2+ years who have owned meaningful front-end systems are welcome.
Experience building interfaces for real-time or streaming data, such as WebSockets or server-sent events, including the state model behind them.
Real depth in component design, state management, and render performance, with examples of problems you profiled and fixed.
Clean, well-tested code, including component and end-to-end tests.
Enough backend fluency to read and shape API contracts; Python is a plus.
Comfort taking a loose ask and turning it into a working interface without a finished design.
A humble, hands-on approach.
Willingness to work on site in Arlington, Virginia.

Preferred Qualifications

Experience building LLM or agent interfaces, including streaming output, tool-call visualization, and citation surfacing.
Experience with data visualization or graph exploration libraries.
Experience building or maintaining a design system.
Experience with accessibility (WCAG) in complex applications.
Experience building analytical, intelligence, financial, or developer-facing tools.
Experience shipping front ends into restricted or offline environments.
An active U.S. security clearance, or eligibility to obtain one.

Compensation

The base salary range for this role is $120,000 to $300,000, spanning our Engineer II and Senior Engineer levels. Where an offer lands depends on scope, autonomy, and technical capability, which we assess through the interview process rather than by years or title. Our ranges are a real guide, and we are flexible for the right person: if your experience clearly exceeds this role's scope, we will consider you at a higher level, with that level's range. Base salary is one part of total compensation, alongside equity and the benefits below.

What We Offer

Health, dental, and vision insurance. 99% of your premiums covered, and 100% of your dependents' premiums.
Optional HSA plan. Lower premium, HSA eligible, fully portable, self-directed or managed.
Health Reimbursement Account for qualified healthcare expenses.
Life insurance of $150,000 plus AD&D, 100% company paid.
401(k) with a 100% match on the first 6%, immediately vested. No cliff, no waiting period. Yours from day one.
Wellhub Gold. Everything from Gold's Gym to Lifetime, fully covered, plus [solidcore], F45, and hundreds of other studios.
Unlimited PTO. Real time off, not accrual-based. Take what you need, no counting required.
Every federal holiday, plus additional paid days off over the winter break.
Supportive leave of absence program, including time off for military service, medical events, and parental leave.
Breakfast, lunch, and endless snacks every day you are in the office.
Pre-tax commuter benefits.
Company phone plan. A new iPhone, fully company paid.

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