> Markdown version of [/jobs/ext/4391043-senior-software-engineer-apis](https://www.wearedevelopers.com/jobs/ext/4391043-senior-software-engineer-apis). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Software Engineer - APIs - **Company:** Unacast Inc. - **Location:** Ashburn, VA, United States (Remote available) - **Experience:** Expert - **Salary:** $125,000.0 - $145,000.0 - **Contract:** Permanent contract - **Skills:** Java (Programming Language), Geographic Information Systems, Application Programming Interfaces (APIs), Agile Methodology, Amazon Web Services, Application Lifecycle Management, Unit Testing, Big Data, Databases, Data Files, Data Visualization, Database Queries, Software Debugging, Spring Framework, JSON, Python (Programming Language), Systems Development Life Cycle, Software Deployment, Software Engineering, Software Requirements Analysis, SQL Databases, Web Services, Data Processing, Scripting, Snowflake, Generative AI, Data Lakes, Data Analytics, Restful APIs, Programming Languages - **Published:** October 31, 2026 - **Apply:** https://www.careerbuilder.com/job-details/senior-software-engineer-apis-ashburn-va--273fcb75-b766-4b56-8a72-e58aae751e77 ## About the Role Software Engineering, Application Programming Interface (API), Data Sets, Software Engineering, Application Programming Interface (API), Big Data, Product Development, Develop and Maintain Customers, Software Development Lifecycle (SDLC), Customer Relations, This position requires significant prior Java development experience, including the Java Spring Framework. Experience with database management and SQL querying are critical as well as AWS experience. The ideal candidate will be team and customer service oriented, innovative, open-minded to different solutions, and driven to deliver solutions that meet or exceed requirements. You believe that simple approaches are better than complex. What You Will Do: Collaborate with product development and other teams to translate business initiatives into concrete technical requirements. Create innovative solutions to support partners and customers by building applications that deliver required functionality while adhering to best practices in development and testing. This includes the development of unit, integration, and runtime tests. Work with the engineering team on the optimal design and maintenance of the large Snowflake data lake that powers the APIs. This includes database table design and efficient SQL querying to produce short API response times. Create quality internal and external documentation for your work. Internal documentation is critical during the development and maintenance of a project and comprehensive external documentation is essential for customer onboarding. Create data, metrics and visualizations, as needed, for complex algorithm verification and optimization. Capabilities: You are both a team player and a self-starter. You are comfortable working independently with only basic guidance, as well as working well within the larger team. You have demonstrated experience translating business problems into technology solutions, and deploying the right tool for the job including Scala, Java, third party web services, scripting languages (e.g. Python, R) and third party tool sets. You are capable of taking a basic description of what is needed, analyzing it and asking the right questions to generate a detailed specification of the software requirements. You can demonstrate that you have developed multiple applications from requirements elaboration to delivery to production. You must have great organization skills and strong communication and documentation skills. You must be able to demonstrate proficiency in leveraging Generative AI tools to accelerate code authorship, unit testing, and debugging, while maintaining strict adherence to security protocols and data privacy standards. Experience: 5+ years' experience in Java 8 and higher software development with the Java Spring Framework used for REST APIs. Demonstrate excellent SQL database skills ranging from database initial creation and design, table design, automated load and maintenance processes, and efficient querying. Snowflake SQL is strongly preferred. Proficiency working in Amazon Web Services (AWS) and utilizing its many services. For example AWS Elastic Container Service for application deployment or AWS X-Ray for debugging. Experience processing data efficiently in JSON and GeoJSON. Proficiency in programming languages such Scala, Python or other similar programming languages. Demonstrated ability to quickly and efficiently break down larger projects to smaller tasks, and handle multiple projects and tasks at the same time. Experience in software or engineering projects from ideation, through development and into production. Proficiency in Agile methodologies. Strong communication skills and fluency in English. ... and it is a positive if Experience with data analytics and data visualization. You have experience working with geospatial data. What we expect of you Demonstrate a proactive and entrepreneurial mindset. Contribute to a positive and enjoyable work environment. We operate like a startup, so things change fast, you need to be agile and proactive. Participate in the on-call rotation. Personal characteristics we value include: high integrity, entrepreneurial spirit, innovative thinking, team player, passion for technology, adaptability, high energy and attention to detail. Other Info This is a remote position that may require occasional travel. Candidates must reside in the continental United States with a preference for individuals who live in the EST time zone and/or those residing in the following states: CT, CO, FL, GA, IL, IA, IN, MD, NC, NJ, NM, NY, PA, RI, SC, TX, VA, WV We offer competitive salaries and benefits and unlimited PTO. The typical base salary range for this role is $125,000 to $145,000. Ranges are based on various factors including the labor market, job type, job level, internal equity and budget. Exact salary offers will be determined by factors such as the candidates skills, qualifications, experience and geographic location. ## Description The Senior Software Engineer will work as part of Unacast's API team, assisting in the development of customer-facing and internal APIs with an emphasis on fast querying of large datasets. The APIs maintained by this team are the core building blocks of our data offering. Successful candidates will demonstrate an ability to translate business problems into technology solutions and products while overseeing the full application life cycle. As a member of the API team, you will work closely with both engineering and product development to deliver creative and effective solutions.