Senior Backend Engineer — Python, FastAPI & Data Systems

Base-2 Solutions, LLC; Washington (District of Columbia); On-site; USD 120,000 - 180,000; Full time

Job summary

Base-2 Solutions, LLC is seeking a Software Engineer Level 5 to develop, maintain, and enhance backend systems supporting mission-focused environments. The role emphasizes Python, FastAPI, PostgreSQL, and high-performance integrations for data-sensitive, high-volume operations.

Candidates should have strong backend experience, data engineering and API development skills, and a TS/SCI with CI Polygraph clearance. This is a demanding, high-impact backend engineering role in a secure environment.

Qualifications

• Active TS/SCI with CI Polygraph.
• Backend development experience.
• Data engineering and API development experience.
• Experience building scalable systems with Python and FastAPI.
• Experience designing and managing PostgreSQL databases with efficient SQL and indexing strategies.
• Proficiency in Python.
• Proficiency in FastAPI.
• Proficiency in PostgreSQL.
• Proficiency in Elasticsearch.
• Experience building high-performance API connections between high-speed, high-volume, mission-critical, data-sensitive systems.

Responsibilities

• Develop, maintain, and enhance complex and diverse software systems, including processing-intensive analytics and real-time systems.
• Provide input to software component design, including hardware/software trade-offs and requirements analysis.
• Design, implement, and integrate software applications or perform software engineering tasks.
• Utilize software engineering and design methodologies appropriate to the development, integration, and production environment.
• Ensure efficient delivery of software engineering capabilities using industry standards and repeatable processes.
• Mitigate risks, control costs and schedule variance, and effectively manage large-scale, integrated software projects.
• Review and test software components for adherence to design requirements and document test results.

Skills

Backend development

Python

Data engineering

API development

System design

Performance optimization

Education

High School Diploma/ GED with 18 years of experience

Associates Degree with 16 years of experience

Bachelors’ Degree with 14 years of experience

Masters’ Degree with 12 years of experience

PhD with 10 years of experience

Tools

FastAPI

PostgreSQL

Elasticsearch

Job description

Base-2 Solutions, LLC is seeking a Software Engineer Level 5 to develop, maintain, and enhance backend systems supporting mission-focused environments. The role emphasizes Python, FastAPI, PostgreSQL, and high-performance integrations for data-sensitive, high-volume operations.

Candidates should have strong backend experience, data engineering and API development skills, and a TS/SCI with CI Polygraph clearance. This is a demanding, high-impact backend engineering role in a secure environment.