Senior Software Engineer I

Zinnia - Employee Referral Board•Boulder, CO

13h•$135,000 - $155,000

About The Position

We are seeking a highly skilled Senior Software Engineer with full-stack experience — strong in back-end and API development, while also comfortable contributing to front-end development when needed. In this role, you will design, develop, and maintain scalable, secure, and high-performance software systems that power Zinnia’s enterprise platforms. You thrive as a hands-on engineer who enjoys solving complex problems, writing high-quality code, and collaborating with cross-functional teams. This role is well-suited for someone with a passion for modern software engineering practices, cloud-native development, and API-driven architectures, with the ability to deliver robust solutions while contributing to team best practices.

Requirements

Bachelor’s or Master’s degree in Computer Science or a related field
8+ years of professional software development experience.
Strong proficiency in Java, .NET (C#) and JavaScript/TypeScript, with experience using modern frameworks such as NestJS for back-end development and React, Angular, or Next.js for front-end applications.
Proven experience designing, developing, and maintaining scalable software systems and versioned APIs.
Experience developing and deploying applications in cloud-native environments, with hands-on expertise in AWS services (Lambda, EC2, S3, API Gateway, DynamoDB, SNS/SQS, RDS).
Experience with API gateways (e.g., Apigee, Kong) and API lifecycle management.
Experience in event-driven architecture and pub/sub messaging patterns, with exposure to event streaming platforms such as Apache Kafka.
Strong knowledge of relational databases (e.g., MS SQL, Oracle, PostgreSQL) and NoSQL databases (e.g., MongoDB, DynamoDB, Cassandra).
Working knowledge of DevOps practices (CI/CD pipelines, environment provisioning, monitoring) and containerization technologies such as Docker.
Strong understanding of software engineering principles, object-oriented design, and design patterns.
Experience working in an Agile/Scrum environment.
Excellent problem-solving, troubleshooting, and communication skills; ability to work collaboratively in a distributed team.
Commitment to continuous learning and staying up to date with the latest technologies in software development.

Nice To Haves

Knowledge of the Life Insurance & Annuities domain.

Responsibilities

Design & development: Design, develop, document, and maintain scalable, secure, and reusable software components and applications — spanning both back-end services/APIs and front-end interfaces.
Best practices: Contribute to defining and implementing coding standards, design patterns, and testing practices across services and integrations.
API lifecycle: Build and maintain enterprise APIs following best practices and collaborate with the API management team to implement gateway capabilities (traceability, monitoring, security, analytics).
Software lifecycle improvements: Support enhancements to the software development and deployment lifecycle for improved speed, quality, and reliability.
Testing & automation: Implement and automate unit, functional, integration, and contract tests for services, APIs, and applications.
Code quality: Write high-quality, maintainable, and performant code; participate in peer code reviews.
Collaboration: Work closely with architects, product managers, and engineers to design solutions that align with enterprise goals.
IAM & security: Integrate applications and APIs with enterprise Identity and Access Management (IAM) solutions.
Innovation: Stay current with emerging technologies and bring ideas to improve scalability, performance, and developer experience.