Senior Python Software Engineer Jobs in Wisconsin

DTN is looking for a full stack Senior Software Engineer to join our team. In this role, you’ll work on innovative products within DTN’s Energy sector.

• Design, develop, and implement GraphQL APIs to provide unified data access across multiple systems;
• Lead the development and expansion of semantic API architecture including schema design, resolver optimization, and data normalization strategies;
• Establish data governance and security practices for semantic API layers;
• Collaborate with Data Engineering teams to integrate data sources and transformation patterns;
• Lead quality improvement processes including code reviews, schema validation, and performance optimization;
• Mentor junior engineers and provide technical leadership on GraphQL and semantic architecture best practices;
• Develop comprehensive documentation for semantic API patterns and implementations.

• Technical Skills:
  • GraphQL & AWS: Expert-level proficiency in GraphQL and AWS AppSync including schema design, batch Lambda resolvers, pipeline resolvers, subscriptions, and caching;
  • Minimum 5 years of AWS cloud experience (Lambda, RDS, DynamoDB, IAM, CloudWatch, X-Ray, Kinesis, Glue, Athena);
  • Experience with AWS CDK or CloudFormation for infrastructure as code;
  • Understanding of Lambda optimization (cold starts, concurrency, VPC considerations).
• Backend & Data:
  • Expert in Node.js for building batch Lambda resolver functions;
  • Proficiency in Python for data processing and Lambda functions;
  • Deep understanding of Lambda batching patterns (DataLoader, batch aggregation, connection pooling, caching);
  • Expert-level SQL and database knowledge (Postgres, MySQL, Oracle);
  • Experience with NoSQL databases (DynamoDB);
  • Understanding of data architecture principles including modeling for transactional and analytical workloads.
• Development Practices:
  • Advanced Git including branching strategies and code review processes;
  • CI/CD pipelines for AppSync and Lambda deployment;
  • Strong testing strategies (unit, integration, schema validation, batch operation testing);
  • Performance profiling and optimization for serverless and databases.
• Professional Skills:
  • Minimum 7 years of software engineering experience with 3-5 years focused on API architecture and data-intensive applications;
  • Strong data architecture background with understanding of data management, integration patterns, and governance;
  • Proven ability to lead technical initiatives and mentor engineers;
  • Excellent communication and documentation skills;
  • Experience in Agile/Scrum environments;
  • Problem-solving mindset for performance, data consistency, and architectural issues;
  • Cost optimization experience in serverless environments.

• AWS Certifications;
• Background in energy, commodities, or supply chain domains;
• Multi-tenant architectures experience;
• Contributions to open-source GraphQL projects;
• Database administration experience across multiple platforms.

• Competitive Salary;
• Unlimited PTO;
• Flexible working hours;
• Remote work model (position dependent);
• Competitive Medical, Dental and Vision Insurance Plans;
• 6% 401(k) matching;
• Unlimited access to 13k+ courses via learning platform to support employee career advancement;
• Employee Assistance Program (EAP).

The targeted hiring base pay range for this position is between $115,000 and $165,000. DTN is a pay for performance organization, which means there is the opportunity to advance your compensation with performance over time. The actual base pay offered for this position will be dependent upon many factors, including but not limited to prior work experience, training/education, transferable skills, business needs, internal equity and applicable laws. The targeted hiring base pay range is subject to change and may be modified in the future. This role may also be eligible for market competitive variable pay and benefits.

DTN is a global data and technology company helping operational leaders in energy, agriculture, and weather-driven industries make faster, smarter decisions. Our Operational Decisioning Platform turns complex data into decision-grade insights - empowering customers to expand their margins, accelerate growth, and outpace risk. With more than 1,200 employees globally, DTN serves the companies that feed, fuel, and protect the world.

DTN is an Equal Opportunity Employer. We welcome and encourage applicants of all backgrounds, including minorities, women, veterans, and individuals with disabilities.