{"schemaVersion":"jobsearcher.job.v1","id":"f1fc9d4dae75bee73b083362","url":"https://jobsearcher.com/jobs/f1fc9d4dae75bee73b083362","canonicalUrl":"https://jobsearcher.com/jobs/f1fc9d4dae75bee73b083362","title":"Staff Software Engineer, Platform & API payments","description":"About the RoleRemitian is looking for a high-agency Staff Software Engineer to join our Platform team and own the API surface that partners and customers build on. Our public API is a product in its own right: it is how accounting firms, payroll providers, and platforms integrate tax payments into their own software. Its design, its contract stability, and its documentation are the product experience for every developer who touches us.This is a staff-level role, which means your scope spans the platform rather than a single feature area. You will work closely with our Platform lead and the rest of the team on the design of the API and the services behind it, contribute to the standards and patterns we build on, and help deliver work that reaches across team boundaries. You will write a lot of code, and you will add leverage through the design decisions you shape and the engineers you help grow along the way.You will work across the stack, from data models and services through to the developer-facing surfaces our integrators use. We are looking for someone who has built API products before and knows the difference between an endpoint that works and an API that developers actually want to use.This role is based in Florida, with Miami preferred, on a hybrid schedule of 3 to 4 days per week in office.Key ResponsibilitiesAPI Product OwnershipOwn the design and evolution of our public API, including resource modelling, versioning strategy, pagination, idempotency, error semantics, and authenticationTreat the API as a product: make developer experience, clarity, and predictability first-class design constraints rather than afterthoughtsOwn backward compatibility and deprecation, so that partner integrations keep working as the platform changes underneath themPartner with product and with our integration partners to turn real-world integration needs into a coherent API surface rather than a pile of special casesSet the standard for API documentation, reference material, and the examples developers copy on their first dayTechnical Leadership and ArchitectureLead the design of significant platform systems and see the architectural decisions behind them through to productionHelp shape technical direction for the Platform team alongside the Platform lead, and align it with the broader engineering roadmapMake and defend trade-offs around performance, scalability, security, correctness, and maintainability, and write those decisions downContribute to the engineering standards, patterns, and best practices the team builds on, and hold the bar in code and design reviewBuild alignment across teams on contracts and shared services, including the hard conversations that come with itPlatform and Product DevelopmentDesign, build, and ship complex features across the stack, from data models and services through to developer-facing surfacesTranslate ambiguous requirements into clean, maintainable, well-tested systemsOwn the shared services and libraries other engineering teams depend on, and treat those teams as customersPartner with product, design, and engineering leadership to scope and deliver substantial bodies of workReliability, Security, and Production OperationsOwn platform services in production, including their reliability, performance, and operational behaviourLead incident investigation and resolution, and drive the follow-up that prevents recurrenceSet the standard for observability, alerting, and testing on critical money-movement and API workflowsBring a security-first mindset to authentication, authorisation, tenancy isolation, and data handling in every review and design decisionOwnership, Mentorship, and Continuous ImprovementTake real ownership of major areas of the platform and be accountable for their outcomesIdentify problems, propose solutions, and drive them to completion without waiting for directionMentor and grow other engineers through code review, pairing, and design feedbackContribute to engineering culture, hiring, onboarding, and standards as the team growsPush back, raise concerns, and surface ideas that improve the platform or how the team worksWho You Are8+ or more years of experience as a software engineer, with a track record of designing and operating production systems at scaleProven experience building API products, meaning APIs consumed by external developers or partners where the contract, the documentation, and the developer experience were part of your responsibilityDeep, hands-on proficiency building production applications with C# and .NET, plus modern JavaScript or TypeScriptStrong experience using LLMs and AI tooling to ship features and accelerate developmentDemonstrated ownership of non-trivial systems from architecture through production, including the operational consequencesStrong systems-oriented judgement across performance, scalability, security, correctness, and reliabilityA track record of technical leadership without formal authority: aligning teams, mentoring engineers, and acting as a force multiplierHigh agency, meaning you find work that needs doing, take ownership, and move things forward without being toldExcellent communicator, able to write a clear design document and explain trade-offs to engineers, executives, and partner developers alikeExcited by a fast-paced startup where priorities shift and ambiguity is part of the jobBased in or willing to relocate to Florida, with Miami preferred, and excited to be in the office at least one day a weekNice to HavesExperience at a payments, banking, or financial infrastructure company where the API was the productExperience building developer tooling such as CLIs, SDKs, or MCP servers, and a feel for what makes them pleasant to useInterest in growing into an engineering management role over time, in addition to strong IC abilityHands-on experience with AWS and modern CI/CD pipelines at scaleSecurity experience such as secure coding, threat modelling, or working in a regulated environmentExperience with Blazor or other modern .NET front-end frameworksExperience with tax, compliance, or other domains where correctness is non-negotiableWhy Join UsOwn the API that partners build their own products on, where your design decisions are visible to every developer who integrates with usJoin a high-performing team building mission-critical fintech infrastructure, and help shape where it goes technicallyReal staff-level scope: deep technical problems, architecture, and cross-team influence, not a bigger backlogWork on systems where correctness genuinely matters, since a wrong tax payment is not a cosmetic bugUse modern tools, including AI and LLM tooling, to move quickly and build with leverageGrow as a technical leader in a team that values high agency and ownership, with room to shape how the Platform team works as it scales","company":"Remitian","rawCompany":"remitian","city":"Miami","state":"FL","isRemote":false,"isActive":false,"createdAt":"2026-09-06T07:49:25.505Z","occupations":[{"code":"15-1252.00","title":"Software Developers","slug":"software-developers"},{"code":"15-1299.08","title":"Computer Systems Engineers/Architects","slug":"computer-systems-engineers-architects"},{"code":"15-1253.00","title":"Software Quality Assurance Analysts and Testers","slug":"software-quality-assurance-analysts-and-testers"}],"industries":[{"code":"513210","title":"Software Publishers","slug":"software-publishers"},{"code":"541511","title":"Custom Computer Programming Services","slug":"custom-computer-programming-services"},{"code":"541512","title":"Computer Systems Design Services","slug":"computer-systems-design-services"}],"jobPosting":{"@context":"https://schema.org","@type":"JobPosting","title":"Staff Software Engineer, Platform & API payments","description":"About the RoleRemitian is looking for a high-agency Staff Software Engineer to join our Platform team and own the API surface that partners and customers build on. Our public API is a product in its own right: it is how accounting firms, payroll providers, and platforms integrate tax payments into their own software. Its design, its contract stability, and its documentation are the product experience for every developer who touches us.This is a staff-level role, which means your scope spans the platform rather than a single feature area. You will work closely with our Platform lead and the rest of the team on the design of the API and the services behind it, contribute to the standards and patterns we build on, and help deliver work that reaches across team boundaries. You will write a lot of code, and you will add leverage through the design decisions you shape and the engineers you help grow along the way.You will work across the stack, from data models and services through to the developer-facing surfaces our integrators use. We are looking for someone who has built API products before and knows the difference between an endpoint that works and an API that developers actually want to use.This role is based in Florida, with Miami preferred, on a hybrid schedule of 3 to 4 days per week in office.Key ResponsibilitiesAPI Product OwnershipOwn the design and evolution of our public API, including resource modelling, versioning strategy, pagination, idempotency, error semantics, and authenticationTreat the API as a product: make developer experience, clarity, and predictability first-class design constraints rather than afterthoughtsOwn backward compatibility and deprecation, so that partner integrations keep working as the platform changes underneath themPartner with product and with our integration partners to turn real-world integration needs into a coherent API surface rather than a pile of special casesSet the standard for API documentation, reference material, and the examples developers copy on their first dayTechnical Leadership and ArchitectureLead the design of significant platform systems and see the architectural decisions behind them through to productionHelp shape technical direction for the Platform team alongside the Platform lead, and align it with the broader engineering roadmapMake and defend trade-offs around performance, scalability, security, correctness, and maintainability, and write those decisions downContribute to the engineering standards, patterns, and best practices the team builds on, and hold the bar in code and design reviewBuild alignment across teams on contracts and shared services, including the hard conversations that come with itPlatform and Product DevelopmentDesign, build, and ship complex features across the stack, from data models and services through to developer-facing surfacesTranslate ambiguous requirements into clean, maintainable, well-tested systemsOwn the shared services and libraries other engineering teams depend on, and treat those teams as customersPartner with product, design, and engineering leadership to scope and deliver substantial bodies of workReliability, Security, and Production OperationsOwn platform services in production, including their reliability, performance, and operational behaviourLead incident investigation and resolution, and drive the follow-up that prevents recurrenceSet the standard for observability, alerting, and testing on critical money-movement and API workflowsBring a security-first mindset to authentication, authorisation, tenancy isolation, and data handling in every review and design decisionOwnership, Mentorship, and Continuous ImprovementTake real ownership of major areas of the platform and be accountable for their outcomesIdentify problems, propose solutions, and drive them to completion without waiting for directionMentor and grow other engineers through code review, pairing, and design feedbackContribute to engineering culture, hiring, onboarding, and standards as the team growsPush back, raise concerns, and surface ideas that improve the platform or how the team worksWho You Are8+ or more years of experience as a software engineer, with a track record of designing and operating production systems at scaleProven experience building API products, meaning APIs consumed by external developers or partners where the contract, the documentation, and the developer experience were part of your responsibilityDeep, hands-on proficiency building production applications with C# and .NET, plus modern JavaScript or TypeScriptStrong experience using LLMs and AI tooling to ship features and accelerate developmentDemonstrated ownership of non-trivial systems from architecture through production, including the operational consequencesStrong systems-oriented judgement across performance, scalability, security, correctness, and reliabilityA track record of technical leadership without formal authority: aligning teams, mentoring engineers, and acting as a force multiplierHigh agency, meaning you find work that needs doing, take ownership, and move things forward without being toldExcellent communicator, able to write a clear design document and explain trade-offs to engineers, executives, and partner developers alikeExcited by a fast-paced startup where priorities shift and ambiguity is part of the jobBased in or willing to relocate to Florida, with Miami preferred, and excited to be in the office at least one day a weekNice to HavesExperience at a payments, banking, or financial infrastructure company where the API was the productExperience building developer tooling such as CLIs, SDKs, or MCP servers, and a feel for what makes them pleasant to useInterest in growing into an engineering management role over time, in addition to strong IC abilityHands-on experience with AWS and modern CI/CD pipelines at scaleSecurity experience such as secure coding, threat modelling, or working in a regulated environmentExperience with Blazor or other modern .NET front-end frameworksExperience with tax, compliance, or other domains where correctness is non-negotiableWhy Join UsOwn the API that partners build their own products on, where your design decisions are visible to every developer who integrates with usJoin a high-performing team building mission-critical fintech infrastructure, and help shape where it goes technicallyReal staff-level scope: deep technical problems, architecture, and cross-team influence, not a bigger backlogWork on systems where correctness genuinely matters, since a wrong tax payment is not a cosmetic bugUse modern tools, including AI and LLM tooling, to move quickly and build with leverageGrow as a technical leader in a team that values high agency and ownership, with room to shape how the Platform team works as it scales","datePosted":"2026-09-06T07:49:25.505Z","dateModified":"2026-09-06T07:49:25.505Z","hiringOrganization":{"@type":"Organization","name":"Remitian","sameAs":"https://jobsearcher.com"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","addressLocality":"Miami","addressRegion":"FL","addressCountry":"US"}},"identifier":{"@type":"PropertyValue","name":"JobSearcher","value":"f1fc9d4dae75bee73b083362"},"url":"https://jobsearcher.com/jobs/f1fc9d4dae75bee73b083362"}}