Senior Fullstack Engineer

Overview 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 go‑to‑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 hyper‑growth phase. Product and Platform 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, full‑stack 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.

Stack Frontend: React, TypeScript, Next.js, Tailwind CSS, Cypress, D3 Backend: Java, Spring Boot, Node.js, 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.

Demonstrate strong learning aptitude with the ability to learn technologies fast and adapt. Build user‑facing features using React, TypeScript, and Next.js. Develop and integrate REST APIs using Java Spring Boot or Node.js‑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 is highly preferable.

Strong knowledge of JavaScript/TypeScript and React/Next.js. 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.). Benefits Competitive salaries, performance bonuses, sales commissions, and equity for specific roles.

Medical coverage, 24/7 employee assistance program, generous vacation and year‑end shutdown, and a flexible hybrid working environment (3 days per week in the office). Role‑specific training, internal workshops, and a learning stipend. Recognition programs and inclusion in company‑wide social events, team bonding activities, happy hours, and off‑sites.

Nium is a global company representing more than 33 nationalities, based in 18 countries and more than 10 office locations. We are committed to providing a safe and welcoming environment for everyone. For more region‑specific benefits details, visit https://www.nium.com/careers#careers-perks.

EEO and Legal 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. Additional Information We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment.

Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us. Salary ranges are dependent on a variety of factors, including skills, qualifications, experience, and geographic location.

Certain roles may offer additional incentives including but not limited to equity and bonus. Your recruiter is happy to share more information about the salary range specific to your working location and other factors at any stage of the hiring process. #J-18808-Ljbffr