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# Senior Back End Web Developer

- **Company:** BLN24
- **Location:** McLean, VA, United States (Remote available)
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Agile Methodology, Akka (Toolkit), Amazon Web Services, Unit Testing, Databases, Command-Query Responsibility Segregation (Software Development), Data Security, Database Queries, Web Development, Github, JSON, Python (Programming Language), PostgreSQL, NoSQL, Object-Relational Mapping, Open Source Technology, Scala (Programming Language), SQL Databases, Web Application Frameworks, ReactJS, Backend, Vue.js, Event Driven Architecture, Integration Tests, Kubernetes, Information Technology, Cassandra, Reactive Programming, Functional Programming, Software Version Control, Docker, Programming Languages, Microservices
- **Published:** November 6, 2026
- **Apply:** https://www.careerbuilder.com/job-details/senior-back-end-web-developer-mclean-va--3d9804fd-c46d-43e6-8085-fec4bd87ee23

## About the Role

Web Programming, Microservices, Scala Programming Language, Web Programming, Database Programming, Management Consulting, Technical Operations, Federal Government, Application Programming Interface (API), Team Player, * 8+ years of professional back-end development experience

 * Experience in functional programming using Scala, including the Akka Toolkit, the reactive programming model, and actor-based concurrency
 * Experience working on a CQRS, event-driven architecture
 * Demonstrated experience developing and optimizing database queries in relational (SQL) and non-relational (NoSQL) structures, such as PostgreSQL and Cassandra / AWS Keyspaces
 * Expertise using Slick or another Object Relational Mapping (ORM) library
 * Expertise building and optimizing APIs with complex JSON payloads
 * Experience creating unit tests and integration tests that validate end-to-end API responses
 * Experience developing containerized microservices, with specific skills developing for Docker containers using Kubernetes orchestration
 * Experience working with GitHub for source code management and planning
 * Bachelor's degree in Computer Science or related field; Master's degree preferred

Preferred Qualifications:

 * Experience using asynchronous Python methodologies or similar
 * Experience with a front-end framework such as VueJS, especially ReactJS
 * Demonstrated experience working on open-source projects, including delivering public-facing solutions
 * Prior engagement at CFPB or other federal financial regulators (e.g., FDIC, OCC, SEC, FRB, NCUA)
 * Experience delivering solutions in a federal FISMA Moderate or comparable security-compliance environment

## Description

* Design, develop, and maintain back-end services using Scala and the Akka Toolkit, applying functional programming, reactive programming, and actor-based concurrency
 * Build and evolve components of a CQRS, event-driven architecture
 * Develop and optimize database queries across relational and non-relational stores, including PostgreSQL and Cassandra / AWS Keyspaces
 * Implement data access layers using Slick or comparable ORM libraries
 * Build and optimize APIs that handle complex JSON payloads
 * Write unit and integration tests that validate end-to-end API responses
 * Develop containerized microservices for Docker and deploy them on Kubernetes
 * Manage source code, reviews, and planning in GitHub, collaborating with architects, front-end developers, and product owners in an Agile team