Mid-Level SQL Engineer

COMFORT SYSTEMS; St. Louis (MO); On-site; USD 80,000 - 110,000; Full time

Job summary

A technology solutions firm is seeking a SQL Engineer to create complex queries for a data-driven application. This role focuses on data validation, performance optimization, and collaboration with dashboard developers. Candidates should hold a relevant degree and have 4-8 years of experience in SQL, with strong skills in relational databases. The position is in St. Louis, MO, and offers opportunities for career growth in a high-visibility environment.

Qualifications

• 4-8 years of experience in SQL development, or 2-6 years with a Master's degree.
• Strong SQL skills, including advanced querying (joins, aggregations, subqueries).
• Experience with enterprise relational databases.

Responsibilities

• Write complex SQL queries to support dashboards.
• Structure query outputs optimized for visualization.
• Ensure accuracy and completeness of datasets for dashboards.

Skills

SQL

Data engineering fundamentals

Linux

Education

Bachelor's degree in computer science or related field

Tools

PostgreSQL

MySQL

Grafana

Tableau

Job description

Overview

If you’ve been building your skills in SQL, data engineering fundamentals, and mission‑driven development, and you’re ready for work that actually moves the needle, this is the kind of opportunity cleared engineers pursue when they want to grow while making real impact. If you take pride in your craft, enjoy solving meaningful data problems, and want your work to support a mission with visibility at senior levels, you’ll thrive here.

We’re hiring a SQL Engineer to support a high‑visibility, data‑driven application that powers analytics and reporting across the organization. In this role, you’ll write complex queries, shape data for dashboards, ensure data accuracy, and deliver reliable datasets that stakeholders depend on every day. You’ll work closely with dashboard developers and application teams to provide clean, consistent, and easy‑to‑consume data for mission users. Our primary development team operates out of Gaithersburg, MD, but innovation doesn’t stop there. We’re able to support onsite engineers in Alexandria, VA; Chantilly, VA; Aurora, CO; St. Louis, MO; and Tucson, AZ, giving top talent multiple paths to join the mission.

And while the requisition requirements may seem standard fare, the position is not; as it will join a high performing team that is changing the way digital engineering and mission operations intelligence is enabled for our customer.

Why This Role Stands Out

• High Impact: Your work directly supports a widely used application that drives real-time decision‑making
• High Visibility: Partner with engineering teams and key stakeholders across programs
• Career Growth: Expand your expertise in large‑scale data systems, performance optimization, and advanced SQL engineering
• Challenging Work: Tackle complex data problems, not routine queries

Essential Responsibilities

• SQL Development: Write complex SQL queries involving joins, aggregations, filtering, subqueries, and window functions to support dashboards
• Data Shaping for Visualization: Structure query outputs in a way that is optimized for dashboard consumption (clear naming, grouping, formatting)
• Dashboard Support: Partner with dashboard developers to define and deliver the data required for visualizations and reporting
• Data Validation: Ensure accuracy, consistency, and completeness of datasets used in dashboards
• Query Performance: Identify inefficient queries and make basic improvements to support responsive dashboards
• Requirements Translation: Translate dashboard and reporting requirements into effective SQL queries

Basic Qualifications

• Bachelor’s degree in computer science, Software Engineering, or related field with 4–8 years of experience; or Master’s with 2–6 years
• US Citizenship
• Active TS/SCI with ability to successfully pass a Polygraph
• Strong SQL skills, including the ability to write advanced queries (joins, aggregations, subqueries, window functions)
• Experience working with enterprise relational databases (PostgreSQL, MySQL, Oracle, etc.)
• Background supporting analytics, dashboards, or reporting pipelines
• Comfortable working in Linux‑based environments
• Proven ability to work independently on data‑centric tasks and ensure data quality

Preferred Qualifications

• Experience with Grafana, Tableau, or similar visualization tools
• Exposure to CI/CD pipelines
• Experience working in Agile environments

Commitment to Non‑Discrimination

All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories for employment in accordance with relevant Laws. Leidos is an equal opportunity employer/disability/vet.

REQNUMBER: R-00181110-OTHLOC-PL-2D2605