{"schemaVersion":"jobsearcher.job.v1","id":"cc8ada10f2bd36b466cad9a7","url":"https://jobsearcher.com/jobs/cc8ada10f2bd36b466cad9a7","canonicalUrl":"https://jobsearcher.com/jobs/cc8ada10f2bd36b466cad9a7","title":"Senior Fullstack (Node.js + React.js)","description":"Location: RemoteEmployment: Full-time, B2B contractLanguage: EnglishAbout the CompanyThe hiring company is an independent product-based SaaS organization with a portfolio of 10+ in-house B2C digital products. The company builds and scales its own products - no outsourcing, no external clients, and no investor pressure.About the RoleThe company is seeking a Senior SDE Fullstack who will take full hands-on ownership of backend and frontend feature development, contribute to architecture decisions, ensure performance, and maintain code quality across a modern SaaS environment.This is a senior individual contributor role, fully hands-on - without people-management responsibilities.What You’ll DoHands-On Engineering (Backend & Frontend)Build and deliver complex features end-to-end using Node.js, NestJS, React.js, Next.js, TypeScript.Design and implement scalable backend services and secure REST APIs.Develop performant frontend components, SSR flows, routing, and state management.Write clean, maintainable, well-tested code.Participate in architectural discussions within the product team.Performance, Reliability & ObservabilityImplement and refine logging, monitoring, and alerting (Sentry, Datadog, Groundcover).Troubleshoot and optimize backend and frontend performance.Participate in incident resolution and root-cause analysis.Improve system reliability, traceability, and error visibility.CI/CD, Git & DevOps CollaborationMaintain and enhance CI/CD pipelines (including GitHub Actions).Work with DevOps to ensure consistent and stable environments across dev/staging/production.Manage and contribute to Git branching strategies (Git Flow or Trunk-Based Development).Ensure smooth, efficient, predictable deployment workflows.Tech Stack RequirementsMust-Have5+ years of professional full-stack engineering experienceStrong production experience with:Node.js, NestJSReact.js, Next.jsTypeScriptSolid PostgreSQL knowledge (data modeling, optimization, indexing)Strong experience with AWS services (Lambda, S3, CloudWatch, SNS/SQS or equivalents)Experience building secure REST APIs (JWT auth, security best practices)Understanding scalable architectures and distributed systems basicsHands-on experience with CI/CD pipelines and GitHub ActionsDocker experienceExperience managing Git branching strategies (Git Flow / Trunk-Based Development)Ability to work hybrid in Warsaw (2–3 days/week in the office)Nice-to-Have (Strong Plus)Kubernetes (K8s)ArgoCD or GitOps workflowsEvent-driven systems (Kafka, RabbitMQ, AWS SNS/SQS)Infrastructure as Code (Terraform)Observability tooling (Sentry, Datadog, Groundcover)Experience with design systems / StorybookExperience with internal utilities or shared packagesExperience with test automation frameworks (Playwright or similar)Key Performance Indicators (KPIs)Reliable end-to-end feature deliveryArchitecture clarity and maintainabilityProduction stability & incident resolution speedCI/CD stability and deployment qualityCode quality, documentation, and testing disciplineWhat the Company OffersCompetitive compensation22 paid vacation days + national holidaysAnnual learning & development budget (courses, certifications, conferences)Opportunity to contribute to a fast-growing multi-product SaaS environmentModern technology stack with minimal legacyHybrid work model with a Warsaw-based officeSenior, autonomous engineering culture focused on product impactInterview ProcessExternal recruiter call (30 min) – introduction, expectationsRecruiter Interview (prescreen, scorecard, expectations)Technical InterviewSDE ChallengeSecond Technical InterviewHR Interview (Professional skills, ways of working, cultural philosophy)","company":"Onhires","rawCompany":"onhires","city":"Jonesboro","state":"IL","isRemote":false,"isActive":false,"createdAt":"2026-04-12T19:28:38.056Z","occupations":[{"code":"15-1252.00","title":"Software Developers","slug":"software-developers"},{"code":"15-1254.00","title":"Web Developers","slug":"web-developers"},{"code":"15-1299.08","title":"Computer Systems Engineers/Architects","slug":"computer-systems-engineers-architects"}],"industries":[{"code":"541511","title":"Custom Computer Programming Services","slug":"custom-computer-programming-services"},{"code":"541512","title":"Computer Systems Design Services","slug":"computer-systems-design-services"},{"code":"513210","title":"Software Publishers","slug":"software-publishers"}],"jobPosting":{"@context":"https://schema.org","@type":"JobPosting","title":"Senior Fullstack (Node.js + React.js)","description":"Location: RemoteEmployment: Full-time, B2B contractLanguage: EnglishAbout the CompanyThe hiring company is an independent product-based SaaS organization with a portfolio of 10+ in-house B2C digital products. The company builds and scales its own products - no outsourcing, no external clients, and no investor pressure.About the RoleThe company is seeking a Senior SDE Fullstack who will take full hands-on ownership of backend and frontend feature development, contribute to architecture decisions, ensure performance, and maintain code quality across a modern SaaS environment.This is a senior individual contributor role, fully hands-on - without people-management responsibilities.What You’ll DoHands-On Engineering (Backend & Frontend)Build and deliver complex features end-to-end using Node.js, NestJS, React.js, Next.js, TypeScript.Design and implement scalable backend services and secure REST APIs.Develop performant frontend components, SSR flows, routing, and state management.Write clean, maintainable, well-tested code.Participate in architectural discussions within the product team.Performance, Reliability & ObservabilityImplement and refine logging, monitoring, and alerting (Sentry, Datadog, Groundcover).Troubleshoot and optimize backend and frontend performance.Participate in incident resolution and root-cause analysis.Improve system reliability, traceability, and error visibility.CI/CD, Git & DevOps CollaborationMaintain and enhance CI/CD pipelines (including GitHub Actions).Work with DevOps to ensure consistent and stable environments across dev/staging/production.Manage and contribute to Git branching strategies (Git Flow or Trunk-Based Development).Ensure smooth, efficient, predictable deployment workflows.Tech Stack RequirementsMust-Have5+ years of professional full-stack engineering experienceStrong production experience with:Node.js, NestJSReact.js, Next.jsTypeScriptSolid PostgreSQL knowledge (data modeling, optimization, indexing)Strong experience with AWS services (Lambda, S3, CloudWatch, SNS/SQS or equivalents)Experience building secure REST APIs (JWT auth, security best practices)Understanding scalable architectures and distributed systems basicsHands-on experience with CI/CD pipelines and GitHub ActionsDocker experienceExperience managing Git branching strategies (Git Flow / Trunk-Based Development)Ability to work hybrid in Warsaw (2–3 days/week in the office)Nice-to-Have (Strong Plus)Kubernetes (K8s)ArgoCD or GitOps workflowsEvent-driven systems (Kafka, RabbitMQ, AWS SNS/SQS)Infrastructure as Code (Terraform)Observability tooling (Sentry, Datadog, Groundcover)Experience with design systems / StorybookExperience with internal utilities or shared packagesExperience with test automation frameworks (Playwright or similar)Key Performance Indicators (KPIs)Reliable end-to-end feature deliveryArchitecture clarity and maintainabilityProduction stability & incident resolution speedCI/CD stability and deployment qualityCode quality, documentation, and testing disciplineWhat the Company OffersCompetitive compensation22 paid vacation days + national holidaysAnnual learning & development budget (courses, certifications, conferences)Opportunity to contribute to a fast-growing multi-product SaaS environmentModern technology stack with minimal legacyHybrid work model with a Warsaw-based officeSenior, autonomous engineering culture focused on product impactInterview ProcessExternal recruiter call (30 min) – introduction, expectationsRecruiter Interview (prescreen, scorecard, expectations)Technical InterviewSDE ChallengeSecond Technical InterviewHR Interview (Professional skills, ways of working, cultural philosophy)","datePosted":"2026-04-12T19:28:38.056Z","dateModified":"2026-04-12T19:28:38.056Z","hiringOrganization":{"@type":"Organization","name":"Onhires","sameAs":"https://jobsearcher.com"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","addressLocality":"Jonesboro","addressRegion":"IL","addressCountry":"US"}},"identifier":{"@type":"PropertyValue","name":"JobSearcher","value":"cc8ada10f2bd36b466cad9a7"},"url":"https://jobsearcher.com/jobs/cc8ada10f2bd36b466cad9a7"}}