Software Development Engineer in Test (SDET)

Ten Mile Square Technologies

Arlington, Virginia, USFull-timeMidPosted Recently

SeleniumCypressJMeterJavaScriptTypeScriptAWSSQL

Best fit for

This role is best for mid-level QA engineers with hands-on experience in Selenium, Cypress, GraphQL, AWS open to working from Arlington, Virginia, 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.
Cypress — Popular for front-end teams that own their own end-to-end suite.

API / backend testing

GraphQL — Different query semantics from REST — expect targeted API-testing questions.

CI/CD and DevOps

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

Programming languages

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

Performance testing (JMeter / k6 / LoadRunner) — Different discipline from functional QA — expect scenario and metrics questions.
Agile / Scrum — You'll be expected to describe how you fit QA into short iterations.
Test management (Jira / Zephyr / TestRail) — Process fluency — writing test cases, tracing coverage, and reporting defects.

Job description

Company Description Ten Mile Square Technologies is a high-end technology consulting firm based in the Northern Virginia area. Our customers routinely call upon us to solve some of the largest scale and hardest problems in computer science and software development. If you have a solid grounding in software engineering, continuous delivery, and computer science, and are looking for a career opportunity to grow and leverage those skills to the fullest while working on cutting edge technologies – Ten Mile Square is the place to be! Job Description OVERVIEW Ten Mile Square is looking for a talented Software Engineer in Test (SDET) who is passionate about technology to join our growing team of product, technology, and software professionals. The initial assignment for the new position is to develop a loan origination system for a financial services enterprise. The successful candidate will work with highly experienced team leads and have an opportunity to learn new technologies, while refining fundamental skills. Salary (Base + Standard Bonus at plan): $149,500 ($130K + $19.5K). JOB RESPONSIBILITIES

Lead the test automation efforts for a loan origination system using Node, Apollo GraphQL, Angular, Camunda, and a suite of AWS components including but not limited to EKS, Lambda, S3, MSK, and Aurora.
Collaborate with SDETs in the organization.
Design test plans for the system
Create automated end-to-end and contract tests
Create a performance testing framework and run performance tests on the system being developed
Direct junior test engineers in their automated and manual testing efforts
Work with the product team to determine what constitutes an effectively tested system
Contribute as member of an Agile team and promote Agile practices
Proactively collaborate with the Ten Mile team on development and knowledge sharing
Represent yourself and Ten Mile Square with integrity, expertise, and value
Maintain the confidentiality of our clients on an ongoing basis
Facilitate the hiring and onboarding of other Software Engineers in Test Qualifications
Expert in software development
High proficiency with TypeScript
Expert in automated testing
Working knowledge of SQL
Working knowledge of at least one of the common frontend JavaScript frameworks (Angular, Ionic, React, Vue), preferably Angular
Working knowledge of at least one end-to-end testing framework
Experience with Selenium, Cypress or similar preferred
Implementation of at least one load testing framework
Experience or exposure to K6, JMeter or similar preferred
Experience testing both backend and frontend components
Full software lifecycle participation: requirements to post-implementation
Linux command line More importantly,
Be passionate about what you do
Demonstrated ability to learn new technologies and concepts quickly
Detail-oriented
High integrity and quality of work ethic
Self-motivated to proactively identify and solve problems
Excellent communication skills – within team and with clients Additional Information EXCEPTIONAL PEOPLE DESERVE EXCEPTIONAL BENEFITS Ten Mile Square Technologies benefits package currently includes:
100% company paid medical, dental, and vision insurance (including family)
100% company paid individual short- and long- term disability
100% company paid vision insurance
3% company contribution to 401(k)
15 days paid time off per year + 1 day/year up to 20 days
10 training days per year
8 company holidays + 2 personal days
Individual performance-based quarterly cash incentive
Combined individual and company based annual cash incentive
Public transit reimbursement Additional Details:
Job Type: Full-time, not C2C
Job Location: Remote, US based only

Job highlights

•Role: Software Development Engineer in Test (SDET)
•Company: Ten Mile Square Technologies
•Location: Arlington, Virginia, US
•Type: Full-time
•Experience: Mid
•Seniority: Mid
•Posted: Recently

Key skills: Selenium · Cypress · JMeter · JavaScript · TypeScript · AWS · SQL

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 handle cross-origin flows in Cypress?
Q4.When would you pick Cypress over Playwright, and when not?
Q5.How do you test GraphQL error handling vs REST 4xx responses?

Rehearse with AI Mock Interview Full interview prep guide

Salary context

Compensation not disclosed.

Ten Mile Square Technologies hasn't disclosed a salary range for this mid-level role. Check our QA/SDET salary benchmarks to anchor your ask for Arlington, Virginia, US.

See QA/SDET salary benchmarks →