Software Development Engineer 3 Jobs in Washington

SEIS is seeking an experienced Software Engineer III to support a high‐profile Fortune 50 Public Sector customer. This role is responsible for leading the design, development, and evolution of complex automation, data, and tracking solutions that support multi‐step, SLA/SLO‐driven operational workflows. The Software Engineer III operates with a high degree of autonomy and technical authority, serving as a key technical partner to IT Project Managers and stakeholders.

The ideal candidate brings advanced hands‐on development experience, strong architectural judgment, and a proven ability to design scalable, secure, and maintainable solutions across multiple systems and technologies.

This is a full‐time, salaried, remote position with limited initial travel as required for onboarding or engagement kickoff.

Security, Eligibility, and Suitability Requirements

· Must have or be able to obtain and maintain a Public Trust suitability determination.

· Must be a U.S. Citizen residing in the U.S., or a Permanent Resident residing in the U.S. for the past three years.

· SEIS participates in E‐Verify to validate authorization to work in the United States.

Role and Responsibilities

Solution Architecture & Technical Leadership

· Lead the design and implementation of complex software, automation, and data solutions.

· Define technical approaches, patterns, and standards aligned to business and operational requirements.

· Serve as a technical authority for solution design decisions and trade‐off analysis.

· Review and approve technical designs and code produced by other engineers.

Advanced Development & Automation

· Design, develop, test, and maintain high‐quality, enterprise‐grade software solutions.

· Lead automation efforts using technologies such as:

· C#

· Python

· Excel VBA

· Microsoft Power Apps

· Microsoft Power Automate

· Microsoft Power BI

· Design and optimize database solutions using Microsoft SQL Server, while supporting integration with and migration from legacy database platforms as required.

· Ensure solutions are performant, secure, scalable, and maintainable.

Database Design & Development

· Design, develop, implement, and maintain relational database structures supporting enterprise applications, workflow automation, operational reporting, and analytics solutions.

· Create and optimize tables, indexes, constraints, views, stored procedures, functions, and other database objects.

· Develop complex SQL solutions supporting application functionality, reporting, business intelligence, and system integrations.

· Lead database schema design, normalization, data modeling, and performance tuning efforts.

· Design and implement data security, integrity, validation, and auditing controls.

· Analyze and optimize query performance, indexing strategies, and database resource utilization.

· Collaborate with software developers, business analysts, project managers, and stakeholders to translate business requirements into efficient and scalable database solutions.

· Support database deployments, migrations, upgrades, backup and recovery activities, and change management processes.

Data, Integration & Systems Engineering

· Architect and implement integrations across multiple systems, including legacy platforms.

· Lead data modeling, normalization, and transformation efforts across disparate data sources.

· Perform advanced analysis to support operational insight, reporting, and decision‐making.

· Identify and resolve complex system, integration, and data issues.

Project Execution & Collaboration

· Partner closely with IT Project Managers to shape technical scope, estimates, and delivery plans.

· Translate high‐level requirements into detailed technical designs and implementation strategies.

· Proactively identify technical risks and constraints and recommend mitigation strategies.

· Support testing strategies, deployment planning, and production readiness.

Sustainment & Continuous Improvement

· Drive continuous improvement of existing applications, automation, and data pipelines.

· Lead root‐cause analysis for production issues and implement long‐term corrective actions.

· Identify opportunities to reduce technical debt and improve system reliability and performance.

· Contribute to documentation, standards, and long‐term technical roadmaps.

Mentorship & Team Development

· Mentor and guide Software Engineer IIs and junior engineers.

· Provide technical leadership through code reviews, design reviews, and knowledge sharing.

· Promote engineering best practices and a culture of quality and accountability.

Qualifications and Education Requirements

· 6–8+ years of software engineering experience in an enterprise or technical environment

· 5+ years of experience designing, developing, and optimizing Microsoft SQL Server database solutions, including stored procedures, views, functions, indexing strategies, and performance tuning.

· Strong experience with T-SQL development, relational database design, normalization, indexing, and query optimization.

· Experience developing and maintaining stored procedures, views, functions, triggers, and other database objects.

· Experience translating business requirements into scalable database architectures and data models. Advanced understanding of software engineering principles, design patterns, and SDLC

· Demonstrated experience leading complex technical solutions from design through delivery

· Strong ability to communicate complex technical concepts to both technical and non‐technical stakeholders

· Excellent analytical, troubleshooting, and problem‐solving skills

· Bachelor’s degree in Software Development, Information Technology, Computer Science, Information Systems, or a related field, or equivalent hands-on experience.

Preferred Qualifications

· 8+ years of software engineering experience

· Experience supporting database modernization or migration initiatives from legacy database platforms to Microsoft SQL Server.

· Experience architecting and integrating enterprise and legacy systems

· Advanced experience with:

o C#

o Python

o Excel VBA

o Microsoft Power Apps

o Microsoft Power Automate

o Microsoft Power BI

· Experience supporting large‐scale, SLA/SLO‐driven operational environments

· Experience providing technical leadership without direct authority

· Strong attention to detail and commitment to engineering excellence

· Ability to balance hands‐on development with strategic technical oversight

Sasaki Evolutionary Integration Services (SEIS) is an SBA 8(a), Service-Disabled Veteran-Owned Small Business (SDVOSB). We have been serving Government, Department of Defense, and Commercial customers since 2009. Our primary focus is Business Process Re-engineering, Decision Modeling and Reporting, Program Management, and Solution Designing.

Our mission is to help our customers and partners succeed by fostering strong relationships and demonstrating unwavering commitment. By continuously building upon our knowledge and experiences, we will provide top quality, value-added products and services for Project Management, Business Proposal Support, Systems Integration, Data Analysis, Quality Management, and Information Technology Infrastructure in a diverse environment.