Software Development Engineer in Test (SDET) Automation Testing

Lumen Solutions Group, Inc.

Washington, District of Columbia, USContractMidPosted Recently

SeleniumAppiumTestNGREST AssuredJavaJavaScriptAWSSQLBDD

Best fit for

This role is best for mid-level QA engineers with hands-on experience in Selenium, Mobile automation (Appium / Espresso / XCUITest), BDD (Cucumber / SpecFlow), REST API testing open to working from Washington, District of Columbia, US.

Skills you need for this role

Detected from the job title, description, and tags.

Automation skills

Selenium — Still the most-asked browser automation framework in QA interviews and legacy suites.
Mobile automation (Appium / Espresso / XCUITest) — Required for teams shipping native or hybrid mobile apps.
BDD (Cucumber / SpecFlow) — Used when product + QA collaborate on executable specs.

API / backend testing

REST API testing — Almost every QA role now expects you to validate JSON contracts and status codes.
RestAssured — Common Java-first API automation library, often paired with TestNG.

CI/CD and DevOps

AWS — Common cloud target for test infra + service integration testing.

Programming languages

Java — Dominant language for enterprise QA + Selenium/RestAssured stacks.
JavaScript / TypeScript — Required for Playwright, Cypress, and modern front-end test tooling.
SQL — Data validation and back-office QA rely on solid SQL.

Domain & process

Accessibility (WCAG / axe) — Regulatory + brand-critical — often owned by QA teams.
Agile / Scrum — You'll be expected to describe how you fit QA into short iterations.

Job description

Company Description Lumen Solutions Group Inc. is a technology consulting Services company based in Florida. We provide a wide array of experienced business and IT professionals supporting clients from solution design to implementation and support. We specialize in professional IT consulting services, IT Staffing, Business/IT Strategy, Business Process Blueprints, Enterprise Architecture, and Enterprise Transformation. Job Role: Software Development Engineer in Test (SDET) – Automation Testing Job Location: Washington, DC (Hybrid) Job Type: Contract Interview Process: 1st Round - Teams Video Screening 2nd Round - In-Person Technical Coding Round in Washington, DC Job Summary: We are seeking a highly skilled SDET with strong hands-on experience in Web, Mobile, and AWS API Automation testing. The ideal candidate should have deep expertise in building scalable automation frameworks and working in Agile/DevOps environments. Key Responsibilities:

Design and maintain automation frameworks from scratch.
Execute automated testing for Web, Mobile, and Enterprise applications.
Perform API automation using Rest Assured.
Integrate automation pipelines with cloud infrastructure.
Develop custom reporting dashboards and reporting solutions.
Collaborate with Development and DevOps teams to ensure quality delivery.
Perform cross-platform, accessibility (ADA), and PCI compliance testing. Required Skills:
10+ years of Automation Testing experience.
Expertise in Selenium, Cucumber, TestNG, Appium, and WebdriverIO.
Strong Java skills including Multithreading, POJOs, and JavaScript execution.
Mobile Automation experience with Android/iOS, Native & Hybrid apps, Xcode, XCUITest, and XCTest.
Experience with AWS, REST Assured, JSON/GSON, SQL, and Mainframe testing.
Hands-on experience with Charles Proxy and API/UI integration testing.
Experience validating GET/PUT/POST/DELETE APIs.
Strong experience with automation pipelines, APK/IPA workflows, and custom reporting solutions (HTML/BDD/Kibana). Preferred:
Automation framework development from scratch.
Cross-browser and cross-platform testing.
Agile/Scrum and DevOps experience. Lumen Solutions Group Inc is an equal opportunity employer. All qualified applicants will be considered for employment without regard to any legally protected status. Skills: Agile Programming Methodologies, Amazon Web Services (AWS), Americans with Disabilities Act (ADA), Android, Apple Xcode, Application Programming Interface (API), Automation, Blueprints, Business Processes, Business Strategy, Cloud Computing, Consulting, Cross-Browser Testing, DevOps, Enterprise Applications, Enterprise Architecture, HTML (HyperText Markup Language), Information Technology Consulting, Integration Testing, JSON, Java, JavaScript, Mainframe Computer, Mobile Applications, Multiplatform/Cross-Platform, Multithreaded Programming, PCI, Professional Services, REST (Representational State Transfer), Reporting Dashboards, Reporting Skills, SQL (Structured Query Language), Scrum Project Management and Software Development, Selenium, Software Design for Test (SDET), Software Engineering, Software Testing, Technical Recruiting, Technical Support, Test Automation, Testing, Web Testing, iOS About the Company: Lumen Solutions Group, Inc.

Job highlights

•Role: Software Development Engineer in Test (SDET) Automation Testing
•Company: Lumen Solutions Group, Inc.
•Location: Washington, District of Columbia, US
•Type: Contract
•Experience: Mid
•Seniority: Mid
•Posted: Recently

Key skills: Selenium · Appium · TestNG · REST Assured · Java · JavaScript · AWS · SQL · BDD

How to prepare for this interview

A 5-step prep plan tailored to this job's stack.

1Revise Selenium deeply — locator strategy, waits, parallelisation, and how you'd structure the framework from scratch. Selenium interview Q&A →
2Practice API-testing scenarios — auth flows, contract validation, and running collections in CI. API testing Q&A →
3Warm up on SQL joins, group-bys, and window functions — most QA rounds include a data-validation query. SQL Q&A →
4Do at least one AI mock interview end-to-end so you're comfortable narrating your answers under time. AI Mock Interview →
5Run your CV through the ATS review so it clears keyword filters for this role before you apply. Resume ATS Review →

Likely interview questions for this role

Tuned to the stack we detected on this job.

Q1.Explain the Page Object Model and how you'd structure it in Selenium.
Q2.How do you handle dynamic waits without using Thread.sleep in Selenium?
Q3.How do you stabilise mobile automation across iOS + Android device farms?
Q4.What's the trade-off between BDD and plain unit-style automation frameworks?
Q5.How do you design a test suite for a REST API from an OpenAPI spec?

Rehearse with AI Mock Interview Full interview prep guide

Salary context

Compensation not disclosed.

Lumen Solutions Group, Inc. hasn't disclosed a salary range for this mid-level role. Check our QA/SDET salary benchmarks to anchor your ask for Washington, District of Columbia, US.

See QA/SDET salary benchmarks →