Senior Data and Software Engineer I (API) (32_2026.1)

affinitysolutions; New York (NY); On-site; USD 145,000 - 160,000; Full time

Benefits offered by this job

Medical insurance

Dental insurance

Vision insurance

401k match

Unlimited vacation

Life insurance

Wellness time off

Employee discounts

Job summary

Affinity Solutions is seeking a Senior Data and Software Engineer I (API) to design, build, and scale RESTful APIs that power data integration across platforms. You will work on high-performance APIs, implement caching and security, and document with OpenAPI.

The role involves leading integrations with major partners and building secure data sharing in a cloud environment. The ideal candidate has 6+ years in backend data engineering, strong SQL/Python, Snowflake expertise, and experience with

Qualifications

• Production-grade RESTful APIs with strong design patterns and backward compatibility.
• Performance optimization: querying, pooling, batching, compression.
• Deep knowledge of OpenAPI/Swagger, OAuth 2.0, JWT, GraphQL and API gateway patterns.
• Experience with external vendors and multi‑party API ecosystems.

Responsibilities

• Architect, build and maintain high-performance RESTful APIs for large-scale data operations.
• Implement APIs with caching, rate limiting, pagination and asynchronous processing.
• Document APIs using Swagger/OpenAPI and ensure monitoring, logging and observability.
• Develop data privacy features for secure multi‑party collaboration and data governance.
• Lead integration projects (LiveRamp XMI, Salesforce, AWS/AMC clean rooms, CAPI).
• Collaborate with infrastructure for deployments and code reviews.

Skills

API design patterns

RESTful APIs

OpenAPI/Swagger

GraphQL

OAuth 2.0

JWT

Python

SQL

Node.js

Express/Fastify

CI/CD

Data privacy

Snowflake

AWS

Security concepts

Data governance

Data modeling

API testing

ETL/ELT

CI/CD pipelines

Tools

Snowflake

Airflow

Redshift

Lambda

S3

Glue

Athena

dbt

OpenAPI tooling

Swagger UI

Tableau/Looker/Sigma

Job description

Affinity Solutions (Affinity) is the leading consumer purchase insights company. We provide a complete view of U.S. and U.K. consumer spending, across and between brands, via exclusive access to fully permissioned data from over 100 million consumers. Our proprietary AI technology, Comet™, transforms these purchase signals into actionable insights for business and marketing leaders to drive optimal outcomes and build lasting customer relationships. www.affinitysolutions.com

About Your Role

Affinity is seeking a highly skilled and experienced Senior Data and Software Engineer I (API) to join our team. In this role, you will be responsible for architecting, building, and maintaining high-performance RESTful APIs that serve as the backbone of our data integration ecosystem. This position requires deep expertise in API development, data technologies, cloud environments, data clean rooms, and modern software engineering practices.

Your Responsibilities

• Design, develop, and maintain high-performance RESTful APIs that handle large-scale data operations with optimal efficiency and minimal latency
• Stay current with emerging API technologies, standards, and best practices, including GraphQL, gRPC, OpenAPI 3.0+, and modern authentication/authorization frameworks
• Implement performance optimization strategies for APIs, including caching, rate limiting, pagination, and asynchronous processing, to ensure scalability and reliability
• Integrate with third-party API vendors and external systems, managing authentication, data transformation, and error handling, and ensuring seamless interoperability
• Develop comprehensive API documentation using industry standards (Swagger/OpenAPI) and implement robust monitoring, logging, and observability solutions
• Design and implement data privacy features and services to enable secure multi-party collaboration, including query constraints, data clean room construction, deployment, and monitoring at scale
• Uphold data governance standards and practices, ensuring compliance with data quality standards
• Implement and enforce data security measures to protect sensitive data, including personally identifiable information (PII) and financial data
• Leverage SQL and Python programming proficiency to extract, transform, clean, and interpret large data volumes (200BIL+ records)
• Design highly performant data structures to ensure optimal storage and retrieval of data
• Utilize advanced database technologies to enhance data storage and processing capabilities
• Participate in code reviews to maintain code quality and consistency; collaborate with the infrastructure team to plan and execute deployments
• Lead and manage integration projects, including:
  • LiveRamp XMI Integration and Salesforce integration
  • Additional clean rooms (AWS/AMC) modeling integration
  • CAPI integrations with walled gardens on behalf of brands
  • MadConnect integration pipes and buildout
  • Opening new integration channels based on client demand

Your Qualifications

• Extensive experience building production-grade RESTful APIs with proven expertise in API design patterns, versioning strategies, and backward compatibility
• Deep understanding of API performance optimization techniques, including query optimization, connection pooling, request batching, and response compression
• Strong knowledge of modern API technologies and standards, including OpenAPI/Swagger specifications, OAuth 2.0, JWT, GraphQL, and API gateway patterns
• Demonstrated success integrating with external API vendors and managing complex API ecosystems with multiple third‑party dependencies
• Experience with API testing frameworks, contract testing, and implementing comprehensive API monitoring and alerting systems
• 6 or more years of experience as a back‑end data/software engineer working on various data technologies, with proficiency in SQL, Python, and Javascript (Node.js)
• 2 or more years of hands‑on experience with Snowflake ecosystem, including expert knowledge of SnowPipes, Streams, Views, performance tuning, data modeling, ELT pipelines, data visualizations, and standard DWH concepts, and experience implementing complex SQL stored procedures
• Minimum 3 years' experience with various AWS cloud technologies and data lake management such as S3, Lambda, Airflow, Redshift, Athena, and Glue
• Demonstratable knowledge of data clean room technologies (e.g., creating secure data shares using RBAC). Knowledge of Snowflake Native apps (v6+) preferred
• Knowledge of all aspects of the SDLC as well as experience with Jenkins and setting up CI/CD processes
• Experience with security concepts such as CCPA, GDPR, SSO, and JWT
• Proficiency in data access controls, including aggregation constraints, projection policies, row access policies, column masking, and differential privacy; knowledge of data controls including semantic models, dbt, honeydew, Iceberg tables, various catalogs (glue, rest, nessie, hadoop etc), and catalog syncing concepts
• Experience with cloud environments such as SNOWFLAKE, AWS, DATABRICKS, LIVERAMP, and GCP
• Familiarity with BI tools such as Thoughtspot, Sigma, Domo, Looker, Quicksights, Tableau; detailed knowledge of AI concepts such as Generative AI chatbots, cortex analyst, agent training, various LLMs, and prompt engineering
• Experience in modeling: Snowpark ML, TensorFlow
• Expert-level experience building, maintaining, and scaling APIs using Node.js, Express, Fastify, or similar frameworks; proficiency with Swagger/OpenAPI specifications, API documentation tools, Next.js, and modern API development practices

Salary Range and Office Hours

$145,000 – $160,000

Office hours: 9am – 5:30pm

Benefits for full‑time employees of Affinity Solutions begin on the first of the month following your date of hire with a generous employer contribution for medical, dental, and vision. In addition to company paid holidays, wellness time off, other wellness benefits, and employee discounts, you will also get employer paid life insurance and have the option to enroll into an employer‑matched 401K Plan. We strongly encourage work/life balance by providing unlimited vacation days, available starting 90 days from your hire date as a team member.