Staff Software Engineer (Platform Core Team)

Felix Technologies•Seattle, WA

8d•Hybrid

About The Position

As a Staff Software Engineer on the Platform Core team, you will join a high-caliber group responsible for the foundational services and infrastructure that power Félix’s products. You will identify bottlenecks, improve system efficiency, and ensure that our services can support the company’s continued growth while maintaining a high level of availability. This role requires balancing rapid execution with sound engineering principles. You will participate in the development of customer-facing and business-critical features in a fast-paced environment, ensuring that new functionality is delivered without compromising system stability or accumulating unnecessary technical debt. Success in this role requires curiosity, strong technical judgment, and the ability to think beyond individual components to deliver solutions that benefit the organization as a whole. The ideal candidate is someone who enjoys solving complex distributed systems problems, takes ownership of outcomes, and is passionate about building systems that are scalable, reliable, and easy for other teams to build upon.

Requirements

8+ years of professional software engineering experience, with a proven track record in building and operating complex distributed systems.
Expertise in backend technologies such as Python (preferred), Go, or Java, along with solid experience in REST APIs, gRPC, and SQL/NoSQL databases.
Deep understanding of distributed systems principles, including idempotency, concurrency control, failure domains, and microservices architecture.
Proven experience improving system resilience (circuit breakers, retries, fallbacks) and building robust observability/monitoring solutions.
Experience operating distributed systems on Google Cloud Platform (GCP), Kubernetes, Terraform, or equivalent cloud-native stacks.
Strong ability to navigate ambiguity, set architectural vision, and drive technical initiatives with company-wide impact.
Ability to break down ambiguous business problems, communicate technical decisions to non-technical executives, and drive alignment across multiple teams.
Demonstrated ability to deliver high-quality software rapidly in a continuous integration and continuous deployment (CI/CD) environment.
Fluent or advanced English.

Nice To Haves

Familiarity with React, HTTP, HTML/DOM, JavaScript, CSS, AJAX
Familiarity with Python, Flask/FastAPI, REST APIs, Redis, SQL
Familiarity with Google Cloud services (Firestore, Cloud Storage, Pub/Sub, Google Artifact Registry, Cloud Run, BigQuery, Cloud Composer, etc.)
Familiarity with Kubernetes, Terraform, NewRelic, PagerDuty

Responsibilities

Design, build, and optimize foundational microservices and infrastructure that power the company’s products.
Improve the resilience of the platform by designing systems that gracefully handle failures. Implement monitoring and observability solutions, improve incident response processes, and build mechanisms such as retries, circuit breakers, fallbacks, and automated recovery strategies.
Identify bottlenecks, improve system efficiency, and ensure services support continued hyper-growth while maintaining high availability.
Set the architectural vision for the platform. Understand how services interact, how data flows through the system, and how decisions made in one area impact the broader platform.
Work alongside other Staff Engineers across Payments, Disbursements, and GRC to align on shared infrastructure, API contracts, and event-driven standards.
Mentor Senior and Mid-level engineers, championing best practices in system design, testing, domain-driven design, and engineering culture.
Thrive in an agile, high-velocity environment, translating product requirements into production-ready code with speed and precision.