Senior Software Engineer

doxo•Seattle, WA

151d•$130,000 - $180,000•Hybrid

About The Position

You will be instrumental in designing, developing, and operating the critical backend services and APIs that power our innovative bill pay platform. Working in a dynamic startup environment, you'll leverage your expertise to build scalable, resilient, and secure systems. This role requires a blend of strong technical leadership, hands-on development, and a commitment to operational excellence, as you contribute to the core infrastructure that drives our company's success. About You You're more than just a developer; you're a pragmatic and driven engineer who thrives on building impactful solutions in a fast-paced environment. You understand that in a startup, especially in the fintech space, balancing thoughtful execution with speed is paramount. You're excited by the prospect of shaping products that handle significant financial transactions and directly contribute to our company's success. We'd love to hear from you if: You're a Pragmatic Problem-Solver: You have a strong bias for action and excel at finding the right balance between high-quality engineering and rapid delivery. You're intentionally curious, critically assess business goals against technical effort, and won't hesitate to propose thoughtful trade-offs – like how cutting 5% of scope might save 50% of effort – to help us make the right calls. You Seek to Understand the "Why": You're naturally curious about our business, the fintech landscape, and specifically the bill pay industry. You strive to understand the company's goals because you know it helps you build more effective and targeted solutions. You Take Ownership of Quality and Security: You see features through from idea to operation, taking deep accountability for their success, reliability, and security. Given that we handle financial transactions, you have an ingrained commitment to software craftsmanship and proactively build robust, secure, and scalable systems. You're a Collaborative Force: You believe that the best outcomes are achieved through teamwork. You're an excellent communicator, actively share your knowledge, prioritize team goals, and enjoy mentoring fellow engineers, helping to elevate the entire team's capabilities. You Drive Continuous Improvement: You possess a strong desire to learn and grow, constantly seeking ways to improve not only your own skills but also our team's processes, codebase, and overall engineering culture. You're Resilient and Adaptable: You navigate ambiguity with confidence and view unexpected challenges or shifting priorities as opportunities to learn and innovate. You're comfortable making architectural decisions that support both immediate needs and long-term scalability.

Requirements

Bachelor's degree in Computer Science or a related field (or equivalent practical experience).
5+ years of experience designing, developing, and implementing complex software systems, particularly high-traffic web applications.
Experience with backend development using Ruby on Rails or similar modern MVC web frameworks and object-oriented programming languages (e.g., Python/Django, PHP/Laravel, Node.js/Express).
Experience with designing, building, and consuming RESTful APIs.
Experience with cloud computing platforms (e.g., AWS, GCP, Azure).
Experience with containerization using Docker and orchestration with Kubernetes.
Experience with relational databases (e.g., PostgreSQL, MySQL).
Proficiency with Git (including branching strategies and collaborative workflows) and continuous delivery practices.
Experience building and maintaining background jobs (e.g., Sidekiq, Delayed Job, SQS).

Nice To Haves

Experience working in a fast-paced startup environment.
Experience within the Fintech industry.
Experience with monitoring and logging tools (e.g., Datadog).
Solid understanding of microservices architectures.
Experience with pub/sub messaging patterns and systems (e.g., RabbitMQ, Kafka, Redis Streams).

Responsibilities

System Design & Architecture: Contribute to the design of scalable, resilient, and maintainable backend services and APIs.
Evaluate and recommend technologies, tools, and patterns to improve system performance and developer productivity.
Participate in architectural reviews and contribute to the long-term technical vision of the platform.
Development & Implementation: Develop, test, and deploy robust backend features and services using Ruby on Rails.
Design, implement, and secure performant RESTful APIs, ensuring consistency and usability.
Write clean, efficient, well-documented, and well-tested code.
Operations & Infrastructure: Own the full lifecycle of your services, from design and development to deployment and operation (“you build it, you run it”).
Participate in a shared on-call rotation schedule to respond to and resolve critical production issues outside of standard business hours.
Contribute to improving CI/CD pipelines and overall operational excellence.
Collaboration & Process: Collaborate effectively with product managers, engineers, and other stakeholders to determine requirements and deliver solutions.
Stay current with industry trends and advancements in backend development and cloud technologies.
Participate in thorough and constructive code reviews, both providing and incorporating feedback to ensure high-quality software development.