Senior Fullstack Engineer at nium

Nium, Global Leader in Payments   Nium, the global leader in real-time, cross-border payments, was founded on the mission to deliver the global payments infrastructure of tomorrow, today. With the onset of the global economy, its payments infrastructure is shaping how banks, fintechs, and businesses everywhere collect, convert, and disburse funds instantly across borders.   Its payout network supports 100 currencies and spans 220+ markets, 100 of which in real-time. Funds can be disbursed to accounts, wallets, and cards and collected locally in 35 markets. Nium's growing card issuance business is already available in 34 countries. Nium holds regulatory licenses and authorizations in more than 40 countries, enabling seamless onboarding, rapid integration, and compliance – independent of geography. The company is co-headquartered in San Francisco and Singapore.  About the Team      The Growth and Customer Experience team in our San Francisco office builds and owns the GoTo market strategy for various products that take Nium’s market offerings forward using our core banking infrastructure rails.  New initiatives include partner integrations for stablecoins, growth in FX and payroll segment verticals, hosted onboarding and taxes for talent marketplaces and seamless Direct Debit support for PayIns.    The team has rolled out properties like the Nium Client Portal, the central self-service web platform for accessing Nium’s global payments infrastructure and seeks to expand our offerings further for supporting our Hypergrowth phase.     Nium Portal is the single entry point for clients to:     - Create and manage virtual accounts   - Send real-time cross-border payouts   - Issue cards and track balances   - View transactions, FX rates, and reporting dashboards  - Monitor compliance, onboarding, and KYC/KYB workflows      Our users include Fintech developers integrating APIs, as well as operations teams managing high-volume financial workflows. We focus on delivering seamless user experiences and building products that balance self-serve simplicity with deep operational power.     Our goal is to turn complex payment infrastructure into a product experience that is intuitive, scalable, and flexible. As we expand into new markets and product lines, we are investing heavily in frontend engineering, Fullstack capabilities, and product velocity to better serve our customers.     This role will be based out of our San Francisco office and will work closely with our core API teams based in India.    Our Stack    Frontend: React, TypeScript, Next.js, Tailwind CSS, Cypress, D3  Backend: Java, Spring Boot, Nodejs, PostgreSQL, REST APIs  Tooling: Docker, EKS, Grafana, ArgoCD, Flagsmith, LaunchDarkly  Responsibilities • Help evolve our fast-prototyping culture to foster innovation and quick market validation • Take ownership of the entire application stack and take us through the entire discovery & validation to the customer revenue cycle • Be a self-starter and work independently with guidance from Technical mentors and management • Strong learning aptitude with demonstrated ability to learn technologies fast and adapt • Build user-facing features using React, TypeScript, and Next.js • Develop and integrate REST APIs using Java Springboot or Nodejs based technologies • Maintain clean, modular, and well-tested code across the stack • Contribute to architectural decisions, code reviews, and shared components • Optimize for performance, accessibility, and responsiveness Requirements • 4+ years of experience building web applications in production environments • Experience with large-scale systems • Background in Fintech or global payment systems will be highly preferable • Strong knowledge of JavaScript/TypeScript and React/Nextjs • Strong focus on Reliability and scalability of applications • Exposure to CI/CD and DevOps tools (Docker, feature flags, monitoring) • Strong fundamentals in structured programming languages (Java/GoLang/C) • Experience integrating with REST APIs and backend systems • Solid understanding of frontend fundamentals (HTML/CSS, accessibility, testing) • Familiarity with backend concepts (Java/Spring Boot, SQL, containers) • Clear, effective communication and collaboration skills • Growth mindset — you ask questions, give feedback, and enjoy learning Nice-to-have • Cyber Security experience • Experience tuning frontend performance (lazy loading, bundle size, etc.). What we offer at Nium   We Value Performance: Through competitive salaries, performance bonuses, sales commissions, equity for specific roles and recognition programs, we ensure that all our employees are well rewarded and incentivized for their hard work.  We Care: The wellness of Nium’ers is our #1 priority. We offer medical coverage along with 24/7 employee assistance program, generous vacation programs including our year-end shut down. We also provide a flexible hybrid working environment (3 days per week in the office).  We Upskill Ourselves: We are curious, and always want to learn more with a focus on upskilling ourselves. We provide role-specific training, internal workshops, and a learning stipend.  We Constantly Innovate: Since our inception, Nium has received constant recognition and awards for how we approach both our business and talent opportunities. Check out CNBC World’s Top Fintech Companies 2024.   We Celebrate Together: We recognize that work is also about creating great relationships with each other. We celebrate together with company-wide social events, team bonding activities, happy hours, team offsites, and much more!   We Thrive With Diversity: Nium is truly a global company, with more than 33 nationalities, based in 18+ countries and more than 10 office locations. As an equal opportunity employer, we are committed to providing a safe and welcoming environment for everyone.   For more detailed region-specific benefits:  [Upgrade to PRO to see link]      For more information, visit www.nium.com.  Depending on your location, certain laws may regulate the way Nium manages the data of candidates. By submitting your job application, you are agreeing and acknowledging that you have read and understand our Candidate Privacy Notice located at www.nium.com/privacy/candidate-privacy-notice. Nium provides equal employment opportunities (EEO) to all employees and applicants for employment without regard to race, color, religion, gender, sexual orientation, national origin, age, disability, or veteran status. In addition to federal law requirements, Nium complies with applicable state and local laws governing non-discrimination in employment in every location in which the company operates. This policy applies to all terms and conditions of employment, including recruiting, hiring, placement, promotion, termination, layoff, recall, transfer, leaves of absence, compensation, and training. Nium expressly prohibits any form of workplace harassment based on race, color, religion, gender, sexual orientation, national origin, age, disability, or veteran status.