Software Engineer

Role: Mid-level Software Engineer

Design, develop, and test software systems focused on building and evolving DTN’s semantic API capabilities.

Responsibilities

• Design and implement GraphQL APIs to provide unified data access across multiple systems.
• Expand semantic API architecture, including:
  • schema design
  • resolver optimization
  • data normalization strategies
• Establish data governance and security practices for semantic API layers.
• Collaborate with Data Engineering to integrate data sources and transformation patterns.
• Improve quality and performance through:
  • code reviews
  • schema validation
  • performance optimization
• Create documentation for semantic API patterns and implementations.

Requirements

• GraphQL & AWS (AppSync) experience, including:
  • schema design
  • batch Lambda resolvers, pipeline resolvers
  • subscriptions
  • caching
• 3+ years AWS cloud experience with services such as Lambda, RDS, DynamoDB, IAM, CloudWatch, X-Ray, Kinesis, Glue, Athena.
• Experience with AWS CDK or CloudFormation (infrastructure as code).
• Understanding of Lambda optimization (cold starts, concurrency, VPC considerations).
• Node.js for batch Lambda resolver functions.
• Python for data processing and Lambda functions.
• Knowledge of Lambda batching patterns (e.g., DataLoader, batch aggregation, connection pooling, caching).
• SQL and database experience (e.g., PostgreSQL, MySQL, Oracle), plus NoSQL (DynamoDB).
• Data architecture understanding for modeling transactional vs analytical workloads.
• Git branching and code review practices.
• CI/CD for AppSync and Lambda deployments.
• Testing experience: unit, integration, schema validation, and batch operation testing.
• Performance profiling and optimization for serverless and databases.

Professional Qualifications

• 4+ years software engineering experience, including 1–2 years focused on API architecture and data-intensive applications.
• Data architecture background: data management, integration patterns, governance.
• Proven ability to lead technical initiatives and mentor engineers.
• Strong communication and documentation skills.
• Experience with Agile/Scrum environments.
• Cost optimization experience in serverless.

Nice to Have

• AWS certifications.
• Domain background in energy, commodities, or supply chain.
• Experience with multi-tenant architectures.
• Contributions to open-source GraphQL projects.
• Database administration experience across multiple platforms.

What You Can Expect at DTN

• Competitive salary
• Unlimited PTO
• Flexible hours
• Remote work model (position dependent)
• Competitive medical benefits