Staff Software Engineer (Golang)

WHO WE ARE Apex Fintech Solutions (Apex) powers innovation and the future of digital wealth management by building tech-forward solutions that help simplify, automate, and facilitate access to financial markets for all. Our robust suite of fintech software enables us to support clients such as Stash, Betterment, SoFi, Webull, and eToro, amongst many others; collectively, Apex powers access to the stock market for over 22+ million end customers.      At Apex, we are changing how the securities industry operates by reinventing the status quo, which was manual, slow, and accessible only by the ultra-wealthy. We're digitizing and democratizing systems so that everyone has an opportunity to invest.    When you're at Apex, you drive this change. You're part of a global team with a clear vision: to be the trusted technology that powers the digital economy. Our offices in Austin, Dallas, Chicago, New York, Portland, Belfast, and Manila are home to over 1,000 employees.    Together, we’re shaping the future of financial innovation. Embrace change. Solve big. Win together. And be G.R.E.A.T. — grit, results, empathy, accountability, and teamwork — with Apex.    We’re proud to be recognized for the innovative work we do, the purpose-driven nature of our work, and the collaborative culture we’ve created. Here are just a few of the many awards we’ve recently received:    Best Places to Work  2026, 2025, 2024, 2023 - Presented by BuiltIn    WealthTech of the Year  2025 - Presented by US FinTech Awards    The World’s Top 250 Fintech Companies  2024 - Presented by CNBC  ABOUT THIS ROLE As a Staff Software Engineer, you will work with developers, designers, product managers, compliance teams, and operational staff to play a critical role in the development of Apex's next generation multi-tenant cloud native wealth management platform serving correspondent firms and their end investors. You will be working on significant critical projects and will take responsibility for all facets of the development process—from early discovery and architectural design through testing and scaling in production. You will support and mentor other team members to improve platform security, multi-tenancy patterns, and development velocity. We are looking for someone who is eager to dive into a highly collaborative and fast-paced environment to build innovative, compliant financial products. Our ideal candidate has a strong sense of ownership, proactively identifies edge cases and constraints before building, balances architectural exploration with disciplined execution, and takes full ownership of system reliability and security. You are an individual contributor who moves fast while making your thinking visible through documentation and enjoys driving complex platform initiatives from discovery through production deployment. Duties/Responsibilities · Lead the design and development of secure, scalable multi-tenant systems for wealth management platform serving firms and millions of end investors. Architect and implement robust backend services in Go, GraphQL BFF layers, and cloud-native infrastructure. · Proactively identify edge cases, regulatory constraints, and failure modes during the design phase. Architect high-volume, scalable workflows and design multi-tenant systems with strong isolation and per-tenant configuration capabilities. · Provide technical guidance and mentorship to engineers on complex workflows, platform security, multi-tenancy patterns, and compliance-aware development. · Design systems that meet SEC, FINRA, and SOC 2 compliance requirements through built-in guardrails, auditability, and data retention policies. · Work effectively with cross-functional teams including product management, compliance, customer integration teams, and executive stakeholders. · Champion coding standards, thorough code reviews, and development best practices. Drive continuous improvement in platform architecture based on production patterns, operational data, and evolving compliance requirements. · Own system reliability, implementing comprehensive monitoring and observability, designing robust error handling and validation, and ensuring SLOs are met for critical services. Experience Required · 10+ years of experience in software development with a strong proficiency in diverse programming languages including Java, Go, Typescript to build robust software applications. Ability to adapt and learn new languages and technologies as required by project demands.  · Strong experience with Go backend services, gRPC, and GraphQL architectures · Proven track record designing and building multi-tenant B2B2C platforms at scale · Experience with GCP cloud-native services including Cloud Run, GKE, BigQuery, and Pub/Sub · Experience with fintech, wealth management, or broker-dealer platforms · Experience with distributed messaging platforms like Pub/Sub, Kafka, or RedPanda is a plus · Working knowledge of SEC and FINRA regulations and their impact on platform architecture · Experience with SOC 2 compliance requirements and implementing them through system design · Experience with PostgreSQL and/or Spanner in high-transaction environments · Knowledge of authentication and identity federation using providers such as Cognito, Auth0, or Okta, including SAML SSO implementation · Experience with authorization systems and relationship-based access control models (e.g., SpiceDB, OPA, Zanzibar-style architectures) · Experience with CI/CD pipelines and tools such as GitHub Actions · Familiarity with infrastructure-as-code tools (Terraform/Terragrunt) preferred · Experience with correspondent or clearing firm platforms is a plus #engineering #mid-senior #full-time #LI-SD1 #APEX ​Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties, or responsibilities required of the employee for this job. Duties, responsibilities, and activities may change at any time with or without notice. Our Rewards We offer a robust package of employee perks and benefits, including healthcare benefits (medical, dental and vision, EAP), competitive PTO, 401k match, parental leave, and HSA contribution match. We also provide our employees with a paid subscription to the Calm app and offer generous external learning and tuition reimbursement benefits. At AFS, we offer a hybrid work schedule for most roles that allows employees to have the flexibility of working from home and one of our primary offices. EEO Statement Apex Fintech Solutions is an equal opportunity employer that does not discriminate on the basis of race, color, religion, sex (including pregnancy, sexual orientation, and gender identity), national origin, age, disability, veteran status, marital status, or any other protected characteristic. Our hiring practices ensure that all qualified applicants receive fair consideration without regard to these characteristics. Disability Statement Apex Fintech Solutions is committed to creating an inclusive and accessible workplace for all candidates, including those with disabilities. We are dedicated to ensuring equal employment opportunities and providing reasonable accommodations to qualified individuals with disabilities. If you require reasonable accommodations to participate in the application or interview process, please submit your request via the Candidate Accommodation Requests Form. We will work with you to provide the necessary accommodations to ensure your full participation in our hiring process.