Software Developer

Fantom Corporation•Chantilly, VA

3d•Onsite

About The Position

Fantom Corporation is a mission-focused organization supporting critical programs across the defense and intelligence community. We partner with our customers to deliver high-impact technical solutions while fostering a culture built on trust, expertise, and long-term career growth. We are seeking an experienced Software Developer to design, build, and operate large-scale, cloud-native big data and graph-based systems supporting mission-critical environments. This role focuses on developing high-performance data platforms, APIs, and user-facing applications capable of processing and analyzing trillions of records across structured, semi-structured, and unstructured datasets. The ideal candidate brings strong Java development expertise, deep experience with big data architectures, graph databases, and NoSQL technologies, and hands-on knowledge of AWS and containerized environments.

Requirements

Strong experience developing enterprise applications using Java
Experience designing and operating large-scale big data systems
Experience developing APIs and microservices-based architectures
Hands-on experience with graph databases and traversal technologies
Experience working with relational and NoSQL databases such as Postgres, MariaDB, MongoDB, Cassandra, Neo4j, and DynamoDB
Experience designing data models for high-performance distributed systems
Experience building data processing pipelines using AWS services such as Lambda and Step Functions
Experience with Python and related libraries
Experience working with data formats including CSV, JSON, AVRO, Parquet, and Protocol Buffers
Experience with Linux environments such as CentOS or Rocky Linux
Experience with Kubernetes, Docker, and container orchestration technologies
Experience using Git-based tools and collaborative development environments
Experience working with structured, semi-structured, and unstructured datasets
Strong understanding of DevSecOps and Agile development methodologies
Experience implementing data security and governance controls
Must be fully cleared with a recent polygraph
Must be willing and able to work fully onsite at the location listed in this posting

Responsibilities

Design, develop, and maintain scalable applications using Java
Architect and operate large-scale big data systems, including persistence, partitioning, indexing, and sharding strategies
Build and maintain RESTful APIs, including troubleshooting and performance optimization
Design cloud-native architectures leveraging AWS and other enterprise cloud platforms
Develop and optimize large-scale graph databases handling tens of billions of relationships
Implement graph traversal solutions using technologies such as Apache TinkerPop, Gremlin, or JanusGraph
Build and operate NoSQL-based solutions for complex data processing environments
Design data models optimized for performance, including partitioning, sorting, aggregation workflows, and stream processing
Develop high-performance serverless and event-driven data processing pipelines using AWS Lambda, Step Functions, and PySpark
Support geospatial indexing and large-scale data indexing solutions
Develop modern user interfaces using React and WebGL
Design and operate graph database platforms such as Apache Cassandra
Conduct technical analysis of graph systems to improve search and query performance
Develop and maintain machine learning operations (MLOps) pipelines
Deploy and manage containerized applications using Kubernetes, Docker, and related orchestration tools
Implement DevSecOps practices in production environments using Git-based configuration management
Support Agile software development and testing practices
Ensure compliance with federal security, governance, and accreditation requirements
Implement data security controls, including encryption, LDAP-based authentication, and audit logging
Collaborate with cross-functional teams to define technical approaches and deliver mission-driven solutions