React Developer Jobs

Become a part of our caring community The Senior Full Stack Engineer Performs software engineering activities in all layers of the stack, from setting up the database to programming in the back-end and the appearance at the front-end. The Senior Full Stack Engineer work assignments involve moderately complex to complex issues where the analysis of situations or data requires an in-depth evaluation of variable factors. As Centerwell builds its AI engineering function from the ground up, we need a platform foundation strong enough to support everything that comes next. As Lead Full-Stack Engineer focused on platform and API engineering, you will design and build the service layer that connects AI capabilities, data systems, and product frontends—setting the standards for how services are built, secured, and operated across the team. You will work with meaningful architectural scope, making decisions that span API design, security patterns, and deployment practices. The platform you build will serve care teams and patients across hundreds of Centerwell clinics. If you want to build platforms that others build on—and do it in service of better primary care—this is the role for you. Key Responsibilities Platform and API Architecture: ** Design and lead development of core backend services, REST and GraphQL APIs, and service-to-service integrations that connect all layers of Centerwell's AI product stack. Security and Compliance by Design: ** Establish patterns for authentication, authorization, rate limiting, PHI access control, and audit logging. Ensure HIPAA compliance is embedded in platform design from day one—not bolted on after the fact. AI and LLM Integration Patterns: ** Define and implement reusable patterns for integrating AI capabilities into product

Our Purpose Mastercard powers economies and empowers people in 200+ countries and territories worldwide. Together with our customers, we’re helping build a sustainable economy where everyone can prosper. We support a wide range of digital payments choices, making transactions secure, simple, smart and accessible. Our technology and innovation, partnerships and networks combine to deliver a unique set of products and services that help people, businesses and governments realize their greatest potential. Title and Summary Software Engineer II Overview Responsible for analysing, designing, developing, testing, and delivering secure, scalable software solutions that meet business needs and Mastercard engineering standards. Drives innovation, quality, and operational excellence while collaborating across global teams. Role In this position, you will: • Design and develop high-quality software solutions aligned with Mastercard standards and best practices. • Own end-to-end SDLC activities, including requirements analysis, design, development, testing, deployment, and production support. • Lead troubleshooting, root cause analysis, and resolution of production incidents. • Participate in architecture discussions, technology evaluations, and Proof of Concepts (PoCs). • Drive quality through code reviews, security reviews, testing, and engineering best practices. • Mentor team members and promote technical knowledge sharing. • Collaborate effectively with cross-functional and geographically distributed teams. All About You • Bachelor's degree in Computer Science, Engineering, Information Technology, or related field. • 3-5 years of experience in software engineering. • Experience building secure, scalable, and resilient applications; Financial Services experience is preferred. • Strong

Zafin is an AI platform company helping regulated institutions modernize how critical work is designed, governed, and delivered. Our technology enables organizations to move faster while maintaining the governance, accountability, and control required in highly regulated environments. Our portfolio includes Zafin AIOS , an agent orchestration platform for governed AI work; the Zafin Banking Platform , which helps banks modernize product, pricing, offers, billing, loyalty, and relationship management; and Zafin IO , an integration platform that connects data, systems, and workflows across complex enterprise environments. Headquartered in Toronto, Canada, Zafin partners with leading financial institutions across North America, Europe, the Middle East, Africa, and Asia-Pacific. As AI transforms the future of financial services, we're building the platforms that help regulated organizations adopt AI responsibly and at scale. About the Role We are looking for a Product Engineer II to join our Banking Platform organization. In this role, you will design, build, and maintain full stack features for a core banking platform product, working across front-end and back-end systems to ship reliable, scalable software. You will collaborate closely with Product, QA, and cross-functional engineering teams to translate requirements into effective technical solutions, contribute to technical design discussions and code reviews, and help embed strong engineering standards across the team. Familiarity or interest in AI-assisted development is a plus, as the product is evolving toward AI-enabled, AIOS-powered workflows. What will you do? Design, build, and maintain scalable, reliable full-stack features across a core Banking Platform product. Translate requirements and designs into effective technical solutions, ensuring clean, maintainable, and well-tested code across front-end and back-end systems. Collaborate with Product, QA, Architecture, Engineering, Business

At Freddie Mac, our mission of Making Home Possible is what motivates us, and it’s at the core of everything we do. Since our charter in 1970, we have made home possible for more than 90 million families across the country. Join an organization where your work contributes to a greater purpose. Position Overview Are you a seasoned software engineer looking for an opportunity work with a variety of technology and make a meaningful contribution to the team? We have an opportunity to join in New Technology Adoption team within Single family Division where you will work in a fast-paced environment to research, implement strategic technical capabilities, champion architectural excellence, research prototype and enable adoption in a large scale on the best practices. Our Impact: Single Family’s NTA line of business enables Best Practices of Modern Applications to the BTO teams by building strategic technology capabilities, research and prototype reference implementation patterns and supports adoption by training, coaching and other meaningful ways. Your Impact: Lead technical and architectural decisions that shape system design, infrastructure strategy, and configuration optimization Analyze business requirements, propose design alternatives aligned with the technical roadmap, and architect microservices-based solutions leveraging Java/JEE frameworks, modern UI technologies, Docker, AWS etc Provide guidance to the project team on high level design, ensuring that the design/solution is consistent with the approved architecture Developing software solutions by studying organizational needs; conferring with users; studying systems flow and work processes; investigating problem areas; following the spec driven development principles. Research, implement, promote “Best Practices” within and outside team for wider ado

Who We Are At Justworks, you’ll enjoy a welcoming and casual environment, great benefits, wellness program offerings, company retreats, and the ability to interact with and learn from leaders in the startup community. We work hard and care about our most prized asset - our people. We’re helping businesses get off the ground by enabling them to focus on running their business. We solve HR issues. We’re data-driven and never stop iterating. If you’d like to work in a supportive, entrepreneurial environment, are interested in building something meaningful and having fun while doing it, we’d love to hear from you. We're united by shared goals and shared motivations at Justworks. These are best summed up in our company values, which are reflected in our product and in our team. Our Values If this sounds like you, you’ll fit right in. Senior Software Engineer, Frontend Department Engineering Who You Are You’ve been building web applications for a while now and are comfortable ramping up on an existing product quickly. You’ve mastered at least one frontend framework, and know how to build highly reliable, modular systems that many people can collaborate on at the same time without stepping on each other’s toes. You have a strong sense for good design, and won’t stop until the user experience is just right. As a Software Engineer, you will be a part of our Frontend Engineering team, focusing on delivering products and capabilities that power Justworks products. You will leverage your experience working with customer-facing applications and design with performance and security in mind. You will be working primarily in JavaScript/TypeScript and prior experience is preferred. Your Success Profile What You Will Work On You’ll be a part of a team developing frontend web apps for both internal and public use. Gather requirements Partner with your team lead to produce clean, effective, on-brand user experiences Implement designs with a high level of fidelit

Who We Are At Justworks, you’ll enjoy a welcoming and casual environment, great benefits, wellness program offerings, company retreats, and the ability to interact with and learn from leaders in the startup community. We work hard and care about our most prized asset - our people. We’re helping businesses get off the ground by enabling them to focus on running their business. We solve HR issues. We’re data-driven and never stop iterating. If you’d like to work in a supportive, entrepreneurial environment, are interested in building something meaningful and having fun while doing it, we’d love to hear from you. We're united by shared goals and shared motivations at Justworks. These are best summed up in our company values, which are reflected in our product and in our team. Our Values If this sounds like you, you’ll fit right in. Department Engineering Who You Are You have experience building web applications, are comfortable ramping up on an existing product quickly, and seek opportunities to continue to grow. You’ve mastered at least one frontend framework, and know how to build highly reliable, modular systems that many people can collaborate on at the same time without stepping on each other’s toes. You have a strong sense for good design, and won’t stop until the user experience is just right. As an Associate Software Engineer, you will be a part of our Frontend Engineering team, focusing on delivering products and capabilities that power Justworks products. You will leverage your experience working with customer-facing applications and design with performance and security in mind. You will be working primarily in JavaScript/TypeScript and prior experience is preferred. Your Success Profile What You Will Work On You’ll be a part of a team developing frontend web apps for both internal and public use. Gather requirements Partner with your team lead to produce clean, effective, on-brand user experiences Implement designs with a high level of fidelity&n

Who we are About Stripe Stripe is a financial infrastructure platform for businesses. Millions of companies, from the world’s largest enterprises to the most ambitious startups, use Stripe to accept payments, grow their revenue, and accelerate new business opportunities. Our mission is to increase the GDP of the internet, and we have a staggering amount of work ahead. That means you have an unprecedented opportunity to put the global economy within everyone’s reach while doing the most important work of your career. About the team Operator Tooling builds software that helps Stripe’s operations teams spend less time on manual processes and more time on the work that needs their expertise. We tackle some of the ugliest and most challenging workflows inside Stripe, from Money Laundering, to Fraud, to Legal battles. It all comes down to how do we make the trillion dollar engine not just process money, but do it in a way that everyone is safe while doing it. What you’ll do You’ll build and improve the platforms Stripe’s operations teams use to manage their work. Working across backend systems, machine learning engines, you’ll turn complex operational needs into reliable tools and integrations, partnering directly with internal users to understand their workflows and improve their experience. To put it easy: we make humans focus on the important work and automate away the noise. Responsibilities Own problems from end to end, managing complexity and working directly with stakeholders to understand business impact, reliability, and operability Contribute to the product roadmap, help shape the team’s vision and strategy, and act as a sounding board for team leadership Uphold Stripe’s high standards for engineering and product quality Mentor newer team members and help them develop their engineering skills Work with stakeholders across Stripe to understand competing needs and balance priorities Keep our systems running smoothly and scale them with an impact-first mindset Who

Become a part of our caring community Most AI engineering jobs are a thin wrapper around a model API. This role is different. We build the platform that transforms millions of clinical documents into trusted, actionable data. Our systems use large language models (LLMs) to read medical records, extract structured facts, answer complex questions with citations back to the source document, and route ambiguous cases to human experts for review. Our users make decisions that impact real healthcare outcomes, so “good enough” is not good enough. Building AI systems that are accurate, reliable, auditable, and scalable is at the core of this role. As a Senior AI Applied Engineer, you will design, build, deploy, and operate production AI systems used at scale within one of the largest health insurers in the United States. You will own solutions end-to-end, from user experience and APIs to model orchestration, evaluation frameworks, infrastructure, and production operations. Why Join Us Build production AI systems where LLMs are in the critical path, not just demos or proofs of concept. Work on extraction, retrieval, agentic workflows, and human-review systems that process real healthcare data at scale. Own projects end-to-end across frontend, backend, AI orchestration, infrastructure, deployment, and operations. Solve challenging problems around accuracy, explainability, traceability, and reliability in regulated environments. Ship quickly in a small, high-impact team that embraces AI-assisted development and rigorous quality standards. Build systems that continuously improve through expert feedback, evaluations, and human-in-the-loop workflows. Key Responsibilities Design, develop, and deploy full-stack AI-powered application

About Forma.ai: Forma.ai is a Series B startup that's revolutionizing how sales compensation is designed, managed and optimized. We handle billions in annual managed commissions for market leaders like Edmentum, Stryker, and Autodesk. Our growth has been fuelled by our passion for fundamentally changing and shaping how companies use sales intelligence to drive business strategy. We’re welcoming equally driven individuals who are excited about creating something big! Senior Staff Backend Engineer About the Team We build enterprise software that helps organizations optimize sales performance, enabling go-to-market agility. Our engineering organization includes multiple product application teams responsible for delivering core customer-facing capabilities. We are seeking a Senior Staff Backend Engineer to join our application teams and help set technical direction across multiple domains within engineering. You'll work alongside staff, senior, and early-career engineers, and partner closely with engineering leadership to define, evolve, and scale the systems that power enterprise-grade product workflows. This is an opportunity to own complex, multi-domain technical problems and shape product direction beyond a single team. We are low on meetings, high on accountability. Most of the teams are in the EST time zone, but we have a few located in AST, PST, and Central as well. What you'll be doing You will play a pivotal role in shaping the technical direction of our application stack across multiple domains. You will lead development efforts for our most complex initiatives, the kind that span two or more teams or product areas, and serve as a technical benchmark for system design, code quality, and long-term maintainability. You'll operate at the intersection of data modelling, business logic, and enterprise-scale reliability, and your work will often set standards that neighboring teams adopt. This remains a hands-on

Customer Success Architect (CSA) team provides technical expertise for the post-sales customer experience. Customer Success Architects are responsible for making sure that our customers are meeting their objectives. They are a vital component of our company’s success, working with customers, partners, and product teams to deliver success for our valued customers. CSA supports multiple post-sales roles including GTM, Support, & Product. What You Will Be Doing Sigma champion and product expert, customers will look to you for advice and expertise Advisor to our customers on technical best practices including Sigma best practices and patterns Performance and tuning Security including SSO, team organization, and row-level security Embedded and API access Related data products like CDW, ETL, and catalog tools Capture product feedback from customers and engage with the product team to improve our product roadmap Identify new use cases to grow accounts and find areas where Sigma can provide the most value to ensure renewals Cultivate customer references for the marketing team Design and develop software solutions for Business Intelligence and analytics products while providing technical expertise for post-sales customer success. Working directly with customers to understand business and technical requirements and implementing tailored analytics solutions in customer environments; advising customers on best practices for implementation, performance, security, embedded analytics, and API access; collaborating with Product Managers and Engineering teams to deliver and improve customer solutions; Documenting software and technical implementations; monitoring deployed solutions and troubleshooting complex technical issues; and learning product capabilities, release processes, and maintenance procedures to ensure successful customer outcomes. Qualifications We Need Minimum 10 years of business intelligence experien

Who We Are At Justworks, you’ll enjoy a welcoming and casual environment, great benefits, wellness program offerings, company retreats, and the ability to interact with and learn from leaders in the startup community. We work hard and care about our most prized asset - our people. We’re helping businesses get off the ground by enabling them to focus on running their business. We solve HR issues. We’re data-driven and never stop iterating. If you’d like to work in a supportive, entrepreneurial environment, are interested in building something meaningful and having fun while doing it, we’d love to hear from you. We're united by shared goals and shared motivations at Justworks. These are best summed up in our company values, which are reflected in our product and in our team. Our Values If this sounds like you, you’ll fit right in. Senior Software Engineer, Frontend Department Engineering Who You Are You’ve been building web applications for a while now and are comfortable ramping up on an existing product quickly. You’ve mastered at least one frontend framework, and know how to build highly reliable, modular systems that many people can collaborate on at the same time without stepping on each other’s toes. You have a strong sense for good design, and won’t stop until the user experience is just right. As a Software Engineer, you will be a part of our Frontend Engineering team, focusing on delivering products and capabilities that power Justworks products. You will leverage your experience working with customer-facing applications and design with performance and security in mind. You will be working primarily in JavaScript/TypeScript and prior experience is preferred. Your Success Profile What You Will Work On You’ll be a part of a team developing frontend web apps for both internal and public use. Gather requirements Partner with your team lead to produce clean, effective, on-brand user experiences Implement designs with a high level of fidelit

Level Up Your Career with Zynga! At Zynga, we bring people together through the power of play. As a global leader in interactive entertainment and a proud label of Take-Two Interactive, our games have been downloaded over 6 billion times—connecting players in 175+ countries through fun, strategy, and a little friendly competition. From thrilling casino spins to epic strategy battles, mind-bending puzzles, and social word challenges, our diverse game portfolio has something for everyone. Fan-favorites and latest hits include FarmVille™, Words With Friends™, Zynga Poker™, Game of Thrones Slots Casino™, Wizard of Oz Slots™, Hit it Rich! Slots™, Wonka Slots™, Top Eleven™, Toon Blast™, Empires & Puzzles™, Merge Dragons!™, CSR Racing™, Harry Potter: Puzzles & Spells™, Match Factory™, and Color Block Jam™—plus many more! Founded in 2007 and headquartered in California, our teams span North America, Europe, and Asia, working together to craft unforgettable gaming experiences. Whether you're spinning, strategizing, matching, or competing, Zynga is where fun meets innovation—and where you can take your career to the next level. Join us and be part of the play! What You'll Do: Develop new and innovative features played by millions of players using Java, C#, C++, Python, javascript. Follow engineering best practices towards ensuring performance, reliability, and measurability Work on large problems and break it up for others to implement. Strong Analytical, programming and debugging skills Perform Design and Code reviews. Be responsible for the Live game health Closely work with other functions like PM, UI/UX, Art, QA Mentor Junior Engineers. Constantly look for opportunities to improve the game performance. Take a hands-on approach in the development of prototypes quickly What You Bring: Masters or Bachelor’s Degree in Computer Science, Engineering or equivalent 4-8 years professional experience working in C#, C++, Javascript, Android, IOS, React, J

Who we are: Sardine is the leading agentic risk platform for fighting financial crime. Our integrated solution unifies data across risk teams to help organizations stop fraud in real time, prevent AI-driven attacks, and automate fraud and AML operations. Sardine’s platform is strengthened by one of the fastest-growing fraud consortiums in the market, spanning more than 6 billion profiled devices, 800 million consumers, and 3 million businesses worldwide. Leading companies including FIS, GoDaddy, Intuit, Edward Jones, ZoomInfo, and Checkout.com rely on Sardine to secure and grow trust in their products. Our culture: We hire talented, self-motivated individuals with extreme ownership and high growth orientation. We value performance and not hours worked. We believe you shouldn't have to miss your family dinner, your kid's school play, friends get-together, or doctor's appointments for the sake of adhering to an arbitrary work schedule. We're a remote-first team spread across time zones, so no office to report to - work from wherever helps you do your best work. Just a couple of things to keep in mind: pay is based on where you're located, and you'll need to keep a home base in the country you're hired in. So while we love the "coffee shop today, mountains tomorrow" life, this isn't a passport-optional, work-from-anywhere-on-Earth kind of remote - think flexible within your country, not borderless. Location: Remote - Brazil To be considered for this position, you must reside in one of the following cities: São Paulo: São Paulo, Campinas, São José dos Campos Rio de Janeiro: Rio de Janeiro Minas Gerais: Belo Horizonte Paraná: Curitiba Santa Catarina: Florianópolis About the Role: As a backend-focused Senior Software Engineer, you will play a pivotal role in designing, constructing, and maintaining APIs, services, and systems across our engineering team. This multifaceted position involves developing new features on a large scale, refining internal tooling and processes,

Level Up Your Career with Zynga! At Zynga, we bring people together through the power of play. As a global leader in interactive entertainment and a proud label of Take-Two Interactive, our games have been downloaded over 6 billion times—connecting players in 175+ countries through fun, strategy, and a little friendly competition. From thrilling casino spins to epic strategy battles, mind-bending puzzles, and social word challenges, our diverse game portfolio has something for everyone. Fan-favorites and latest hits include FarmVille™, Words With Friends™, Zynga Poker™, Game of Thrones Slots Casino™, Wizard of Oz Slots™, Hit it Rich! Slots™, Wonka Slots™, Top Eleven™, Toon Blast™, Empires & Puzzles™, Merge Dragons!™, CSR Racing™, Harry Potter: Puzzles & Spells™, Match Factory™, and Color Block Jam™—plus many more! Founded in 2007 and headquartered in California, our teams span North America, Europe, and Asia, working together to craft unforgettable gaming experiences. Whether you're spinning, strategizing, matching, or competing, Zynga is where fun meets innovation—and where you can take your career to the next level. Join us and be part of the play! What You’ll Do : Develop new and innovative features played by millions of players using Java, C#, C++, Python, javascript. Follow engineering best practices towards ensuring performance, reliability, and measurability Work on large problems and break it up for others to implement. Strong Analytical, programming and debugging skills Perform Design and Code reviews. Be responsible for the Live game health Closely work with other functions like PM, UI/UX, Art, QA Mentor Junior Engineers. Constantly look for opportunities to improve the game performance. Take a hands-on approach in the development of prototypes quickly What you bring: Masters or bachelor’s degree in Computer Science, Engineering or equivalent 8+ years professional experience working in C#, C++, Javascript, Android, IOS, React, Java Solid fundamenta

Who We Are Notion is the collaborative AI workspace where teams and agents think together . We're building one place where your knowledge, projects, meetings, and AI tools live side by side, so work is faster, clearer, and less fragmented. Millions of individuals, small teams, and large companies run their work on Notion. Notinos (our employees) are customer zero in bringing this future of work to life. We care about craft, building things that last, and the belief that great work is still fundamentally human. Our goal isn’t to ship the next feature. Each and every team of Notinos is working to set the standard for how humans work together in the AI era. From building a business’s system of record to making and managing AI agents to automating away the busy work, we care deeply about giving our customers more time for their life’s work. Notion is an in person company, and currently requires its employees to come to the office for three Anchor Days (Mondays, Tuesdays, and Thursdays). This internship will take place from Jan 25 - Apr 16 and you will need to be able to work out of our NY or SF office during this time. About the Role: Mobile devices have reshaped personal computing—the power of a desktop now fits in our pockets. By giving everyone the building blocks to create their own tools, we'll solve more problems wherever we go. A delightful, intuitive mobile experience: that's our guiding light, and we need Android and iOS engineers to make it a reality. During your 12-week internship, you will be paired with a mentor that will help guide you as you work closely with our team to build and ship impactful projects. These projects will drive valuable impact to our customers and engineers. Take a look at what our past intern cohort worked on with our Blog post here and here and TikTok post. What You'll Achieve: Write clean, secure, tested, and documented code. You'll collaborate with the team to strategize, mold, and develop innovative features for our Android and iO