Senior Software Engineer (Fintech Platform)

Socket.dev; Seattle (WA); Hybrid; USD 140,000 - 190,000; Full time

Benefits offered by this job

Stock options

Performance bonus

Benefits package

401(k)

Hybrid work

Learning opportunities

Unlimited PTO

Parental leave

Job summary

Félix is seeking a Senior Platform Engineer to join the Platform Core team. You will design, build, and optimize foundational microservices and infrastructure powering Félix’s products, balancing rapid delivery with solid engineering principles.

You will tackle bottlenecks, improve reliability, and collaborate with product, operations, and compliance to deliver scalable, resilient financial solutions for millions of users.

Qualifications

• 5+ years of experience as a Software Engineer, including experience in a fast-paced, dynamic environment.
• Proven track record of building, shipping, and iterating on software applications, particularly in the Fintech domain.
• Solid foundation in algorithms and data structures.
• Experience designing and implementing web services, including REST APIs.
• Familiarity with Hexagonal Architecture, Event-Driven Architecture, and practices like A/B Testing, Feature Flags, and Gradual Rollouts.
• Domain Expertise: Experience in building and maintaining payment systems, financial disbursement solutions, or compliance-driven platforms is highly desirable.
• Knowledge of security protocols, compliance standards, and KYC/AML processes.
• A passion for developing products that make a real impact on millions.
• Commitment to continuous learning and staying abreast of emerging technologies.
• Excellent collaboration and prioritization skills in a team-oriented environment.
• Curiosity and/or experience in Fintech is a plus (equivalent competencies will also be considered).

Responsibilities

• Platform Architecture & Development: Design, build, and optimize foundational microservices and infrastructure that power the company’s products.
• System Resilience: 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.
• Scalability & Performance: Identify bottlenecks, improve system efficiency, and ensure services support continued hyper-growth while maintaining high availability.
• Cross-functional Collaboration: Work closely with product, operations, compliance, and other business units to deliver holistic financial solutions.
• Mentorship & Growth: Mentor junior developers and promote best practices across the engineering team.
• Continuous Improvement: Leverage user feedback and system analytics to refine and iterate on platform capabilities.

Skills

REST APIs

Event-Driven

Hexagonal Architecture

A/B Testing

Feature Flags

Gradual Rollouts

Security & Compliance

KYC/AML

Fintech domain

System scalability

Job description

About Us

At Félix, we are building the indispensable financial companion for Latinos in the US. We combine an AI-powered, conversational-first interface with real-time financial infrastructure to make cross-border money movement as easy as sending a text. Starting with fast, affordable remittances powered by AI and crypto rails, we are expanding into credit, savings, and wallet services to support the complete immigrant financial journey. Our ambition is to deliver a white-glove financial experience with the simplicity of a conversation to a community the traditional financial system has historically overlooked. We are a hyper-growth Series C company, backed by over $300 million in funding from top-tier global investors, including Andreessen Horowitz, QED, Castle Island, Switch Ventures, HTwenty, Monashees, General Catalyst Customer Value Fund. This isn't just about the numbers; it's a testament to the trust our investors have in our vision and our team. Additionally, Félix was selected as an “Endeavour Entrepreneur” and was a recipient of the CrossTech Fintech Startups Award. Joining Félix means you will be part of a team building a legacy, a company that will outlive us all. This is a rare opportunity to apply your skills to a deeply meaningful mission—serving a community that has been underserved for too long because we are obsessed with our customers. We get things done with urgency and focus, driven by extreme ownership over our impact. We collaborate without ego, fostering radical transparency and fierce loyalty so we can grow together. Because we aim for insanely great rather than just good enough, we stay insatiably curious—always experimenting, building the future today, and delivering a product that truly makes our users' lives better.

About the Role

In this role, you will work 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.

Technology Stack:

• We are technology agnostic and value candidates with diverse backgrounds. While familiarity with the following is helpful, your willingness to learn and adapt is paramount:
• Front-end: React, HTTP, HTML/DOM, JavaScript, CSS, AJAX
• Back-end: Python, Flask/FastAPI, REST APIs, Redis, SQL, gRPC
• Cloud: Google Cloud services (Firestore, Cloud Storage, Pub/Sub, Google Artifact Registry, Cloud Run, BigQuery, Cloud Composer, etc.)
• Infrastructure: Kubernetes, Terraform, NewRelic, PagerDuty

Responsibilities

• Platform Architecture & Development: Design, build, and optimize foundational microservices and infrastructure that power the company’s products.
• System Resilience: 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.
• Scalability & Performance: Identify bottlenecks, improve system efficiency, and ensure services support continued hyper-growth while maintaining high availability.
• Cross-functional Collaboration: Work closely with product, operations, compliance, and other business units to deliver holistic financial solutions.
• Mentorship & Growth: Mentor junior developers and promote best practices across the engineering team.
• Continuous Improvement: Leverage user feedback and system analytics to refine and iterate on platform capabilities.

Requirements

• 5+ years of experience as a Software Engineer, including experience in a fast-paced, dynamic environment.
• Proven track record of building, shipping, and iterating on software applications, particularly in the Fintech domain.
• Solid foundation in algorithms and data structures.
• Experience designing and implementing web services, including REST APIs.
• Familiarity with architectural patterns such as Hexagonal Architecture, Event-Driven Architecture, and practices like A/B Testing, Feature Flags, and Gradual Rollouts.
• Domain Expertise: Experience in building and maintaining payment systems, financial disbursement solutions, or compliance-driven platforms is highly desirable.
• Knowledge of security protocols, compliance standards, and KYC/AML processes.
• A passion for developing products that make a real impact on millions.
• Commitment to continuous learning and staying abreast of emerging technologies.
• Excellent collaboration and prioritization skills in a team-oriented environment.
• Curiosity and/or experience in Fintech is a plus (equivalent competencies will also be considered).
• These are the applicable requisites, although equivalent competencies in any of the above will also be considered.

What We Offer

• Salary range: $140,000 - $190,000
• Initial stock options grant
• Annual performance bonus
• Health, dental, and vision plans
• 401(k) with employer match
• Hybrid working model.
• Continuous learning opportunities
• Unlimited PTO
• Paid parental leave
• Empowering opportunities for growth in a dynamic entrepreneurial environment

Equal Opportunity Employer

At Félix, we are committed to providing equal employment opportunities to all qualified employees and applicants without regard to race, religion, nationality, sex, sexual orientation, gender identity, age, or disability. This policy applies to all terms and conditions of employment, including recruitment, hiring, placement, promotion, training, compensation, benefits, and termination.

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