[All remote jobs](https://jobicy.com/jobs.md)[![Flex logo](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2025/06/7bfdefe3-221.jpeg)](https://jobicy.com/company/flex.md)[Flex](https://jobicy.com/company/flex.md) # Senior Software Engineer, Backend AI Summary Flex is seeking a senior backend engineer to build and operate financial-platform services, with particular responsibility for card processing, card issuing, and core transaction ledgering. The role emphasizes end-to-end ownership of architecture, API contracts, data models, scalability, security, observability, and production operations. Candidates need strong Node.js and TypeScript experience, distributed-systems knowledge, cloud exposure, and the ability to mentor peers. This is an early-stage, high-accountability position involving on-call work and rapid delivery of systems that move money at scale.[Apply for this job](#job-application)[View company](https://jobicy.com/company/flex.md)ShareRemote from[Brazil](https://jobicy.com/job-region/brazil.md)SalaryUSD 55k–100k / yrDepartment[Software Engineering](https://jobicy.com/categories/engineering.md)EmploymentFull TimeExperienceSeniorPublished4 Nov 2026Apply before4 Dec 2026Listing views38Application actions2Application toolkit ## Make your next move. Prepare your resume, explore your fit, and draft a cover letter for this opportunity. Opportunity details ## About this role. Flex is building the AI-native private bank for business owners. We’re re-architecting the entire financial system for entrepreneurs—from the first dollar a business earns to how that value compounds, moves, and is ultimately spent in real life. Banking, credit, payments, personal finance, and financial operations—rebuilt from the ground up as a single, intelligent system. Flex is the full financial home for ambitious owners. Since launching publicly in September 2023, Flex has scaled from zero to nine-figure annualized revenue, with a clear path to profitability by late 2026. We move fast, ship relentlessly, and operate with extreme ownership. Our customers are affluent business owners ($3–$200M in revenue)—the backbone of the economy and one of the most underserved segments in finance. They’re stuck with outdated banks and fragmented tools. We’re replacing all of it. The opportunity is massive: a ~$1T+ revenue market hiding in plain sight. Our ambition is to build a $100B+ company by delivering a product that is fundamentally better—not incrementally improved. Flex has raised $100M+ in equity and $300M+ in debt. – Mission-critical problems: We build software that directly controls how money moves at scale. – High bar, low ego: Small teams, exceptional people, real ownership. – Speed over comfort: We prioritize execution, quality, clarity, and results. – Enduring impact: What we’re building will define how a generation of owners runs their businesses. Team & Locations We hire exceptional people who want to build hard things and see their work matter immediately. Roles are available in: San Francisco, Miami, New York, and fully remote. Flex Fuels Ambition. The Role We are looking for engineers who are excited to be part of our early story and help us build a diverse and vibrant company. As a senior software engineer you will have the opportunity to work across the entire stack with a focus on the back-end. You will have the opportunity to learn and drive the creation of financial products and experiences to help our customers reach their full potential. You should have a strong sense of ownership and enjoy taking projects from inception to release. As an early employee, you’ll be working with a nimble team of committed and talented engineers and having a large, long-term impact on technical design and engineering culture. We are open to candidates from Canada, the United States, and Colombia. ### What You’ll Do * Ownership over large domains and features related to card processing/issuing, and core ledgering of financial transactions * Play a critical role in the development, design, and maintenance of Flex’s platform and services. * Architect well thought-out services and data models that ensure Flex’s continued growth * Own problems end-to-end, thinking through everything from api contracts, data, scalability, security, observability, and metrics. * Lead by example and mentor engineers in all aspects of planning, development and testing. * Be a catalyst for driving best-in-class technology frameworks and tooling while staying engaged with the latest technology trends. * Be on call, with the expectation to ability to solve problems and find solutions for the servicing team ### What You Need * Proficiency in NodeJS+Typescript and server design principles. * An understanding and interest in architectural patterns for highly available, scalable, low-latency, asynchronous systems * Ability to hold yourself and the team to high standards. * Strong communication (written and verbal) and interpersonal skills. * Ability to provide in-depth evaluation of multiple technical directions and determine tradeoffs of each. * Strong propensity to make data-driven decisions on technical architecture and project prioritization. * Exposure to modular monoliths and micro-services along with the benefits and challenges they bring. * Experience with any cloud based provider like Google Cloud, AWS, or Azure. * Four or more years of relevant industry experience with a track record of shipping high-quality products and features at scale. * A strong work ethic and are ready to grind * Have built and shipped a working project or product, ideally something complex ### Compensation ### Additional Information Interested? We’d love to hear from you At Flex, we value passion, determination, and honesty. Even if you don’t fully match the job specifics, we encourage you to apply. Unusual career paths and unique skills can help you stand out. We believe diversity drives our success. Join us at jobs@flex.one Why Join Us Build something generational — Capture the full lifecycle of money for ambitious business owners. Work on real money, real risk — Payments, credit, and banking at serious scale. Solve hard problems — AI, underwriting, compliance, and global finance from first principles. True ownership — Small teams, high trust, real accountability. Founder-level exposure — Direct access to leadership, customers, and investors. High bar, high taste — Move fast without cutting corners. Elite peers — People here are builders, not tourists. Real upside — Meaningful equity if you help build something big. Show more [Apply now >](https://jobicy.com/jobs/158960-senior-software-engineer-backend-2.md) * ![Upload CV](data:image/svg+xml;base64,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) ### Upload your resume now To unlock remote work opportunities and be discovered by global employers. This job listing has been manually reviewed by the Jobicy Trust & Safety Team for compliance with our posting guidelines, including verification of the company's legitimacy, accuracy of job details, clarity of remote work policy, and absence of misleading or fraudulent content. ## Role DNA A quick view of the complexity, pace, ownership and collaboration implied by the job description. ### Job Complexity 5/5EasyHard ### Pace & Pressure 5/5RelaxedFast-paced ### Autonomy Level 5/5GuidedFull ownership ### Communication Load 4/5IndependentCollaborative AI insightThe engineer will design and support highly available financial systems where correctness, security, latency, and operational resilience are critical. The role also requires broad technical ownership, architectural decision-making, mentoring, and on-call incident resolution in a fast-moving environment. ## Salary analysis Estimated compensation compared with the broader US market for similar roles. Estimated job median (per year)Market rate$77,500US market range (per year)$60k–$115k0$126.50k AI insightThe employer discloses a base compensation range of $55,000–$100,000 USD per year, with a midpoint of $77,500. This range is plausible for a remote senior backend engineering role with the posting's potentially international hiring scope; estimated market pay is $60,000–$115,000 USD per year depending on hiring country, depth of fintech experience, and production-systems ownership. ## Core skills Skills and capabilities most closely associated with this opportunity. [Node.js](https://jobicy.com/jobs?search_keywords=Node.js.md)[TypeScript](https://jobicy.com/jobs?search_keywords=TypeScript.md)[Backend Engineering](https://jobicy.com/jobs?search_keywords=Backend%20Engineering.md)[Distributed Systems](https://jobicy.com/jobs?search_keywords=Distributed%20Systems.md)[Microservices](https://jobicy.com/jobs?search_keywords=Microservices.md)[API Design](https://jobicy.com/jobs?search_keywords=API%20Design.md)[Data Modeling](https://jobicy.com/jobs?search_keywords=Data%20Modeling.md)[Financial Transactions](https://jobicy.com/jobs?search_keywords=Financial%20Transactions.md)[Card Processing](https://jobicy.com/jobs?search_keywords=Card%20Processing.md)[Ledger Systems](https://jobicy.com/jobs?search_keywords=Ledger%20Systems.md)[Cloud Computing](https://jobicy.com/jobs?search_keywords=Cloud%20Computing.md)[Scalability](https://jobicy.com/jobs?search_keywords=Scalability.md)[Security Engineering](https://jobicy.com/jobs?search_keywords=Security%20Engineering.md)[Observability](https://jobicy.com/jobs?search_keywords=Observability.md)[Technical Mentoring](https://jobicy.com/jobs?search_keywords=Technical%20Mentoring.md) Sample interview questionsHow would you design a ledger service that preserves correctness when processing high volumes of asynchronous financial events?I would use an append-only double-entry ledger with immutable journal entries, idempotency keys, clear transaction states, and strict validation of balancing rules. I would make message consumption resilient through durable queues, retries with dead-letter handling, and deduplication, while exposing auditable records and reconciliation workflows. Describe how you would evaluate a modular monolith versus microservices for a new card-processing domain. I would begin with domain boundaries, team ownership, expected scaling patterns, reliability requirements, and operational maturity. A modular monolith can accelerate early delivery and preserve transactional consistency, while independently deployed services are appropriate when domains need separate scaling, release cadence, or fault isolation; I would define interfaces so the architecture can evolve deliberately. What practices would you use to make a Node.js and TypeScript service reliable in production? I would enforce strong typing and validation at system boundaries, implement structured logging, metrics, tracing, health checks, timeouts, and circuit-breaking where needed. I would also use automated tests, safe migrations, staged releases, alerting tied to user impact, and runbooks for common operational incidents. How do you make an architecture decision when multiple technical approaches are viable? I document the problem, constraints, alternatives, expected operational impact, security implications, delivery cost, and reversibility of each option. I then seek input from relevant engineers and stakeholders, use available data or prototypes to reduce uncertainty, make the trade-offs explicit, and record the final decision in an ADR. Tell us how you would handle an on-call incident affecting a money-movement workflow. I would first assess impact, stop or contain unsafe processing if necessary, and communicate status to the incident team and stakeholders. I would use logs, traces, metrics, and recent-change history to identify the failure path, apply the safest mitigation, validate recovery and data integrity, and follow with a blameless post-incident review and durable corrective actions. Next step ## Apply now. Follow the employer’s application method and review Jobicy’s safety guidance before sharing personal information. Keep exploring ## Related remote jobs. * ![Welo Global logo](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2026/06/83c40f94-221.webp) Welo Global Nov 4 New ### [English to Maltese Review Lead for UI, Marketing & Product Content](https://jobicy.com/jobs/158982-english-to-maltese-review-lead-for-ui-marketing-product-content.md) About Welo Global Welo Global is a leader in multilingual AI, technology, and content solutions serving over 2,000 clients in 300 languages. 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