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Senior Backend Engineer eCommerce
Job Description
As a Senior Backend Engineer, youll join a growing global team, shaping the future of eCommerce. Youll develop and maintain the core selling and order management capabilities for all verticals. Working in a highly distributed, cutting-edge environment, youll play a central role in building scalable, resilient systems that handle millions of requests per minute.
Build and maintain backend systems to process 1.5 million API requests and 400,000 events per minute
Design, implement and optimize scalable and resilient systems with an API-first approach
Solve high-scale technical challenges in a distributed microservices environment (~100 microservices)
Collaborate with cross-functional teams to ensure seamless integration and functionality across the platform
Lead technical initiatives to improve system performance, reliability and scalability
Mentor and guide junior engineers to help them reach their full potential
Write clean, test-driven code, ensuring high-quality deployments to production for millions of users.

We are seeking a Senior Backend Platform Engineer to join our core engineering team and lead the development of scalable, high-performance backend systems. In this role, youll design and optimize platform services that power large-scale applications. Youll collaborate with cross-functional teams to ensure our systems are robust, efficient, and future-ready.


Your ownership will include:

Design, develop, and maintain backend services, APIs, and microservices.
Optimize performance, scalability, and reliability across the platform.
Collaborate with frontend engineers, DevOps, and product teams to deliver seamless integrations.
Implement best practices in backend architecture, security, observability, and automation.
Work with cloud-native technologies and distributed systems (e.g., Kubernetes).
Develop and maintain CI/CD pipelines for smooth deployments and testing.
Troubleshoot performance issues and resolve production incidents.
Write clean, maintainable, and well-documented code, and participate in code reviews.

We are looking for a Senior Backend Engineer to join our R&D team in developing the new rising product in the health landscape.
As a Senior Backend Engineer at our company, you will have an impact on how we architect, build, scale, and maintain our backend systems. You will provide technical guidance and mentorship to other engineers on the team, help establish and maintain best practices for development, and participate in the development of the companys technological roadmap. Youll solve complex engineering challenges and drive engineering excellence in a dynamic environment and rapidly increasing scale.
Our ideal candidate has a real passion for making a positive change in the world, for technology and customers, has great communication skills, and loves to constantly improve themselves, our working practices, and our code base.
This is a great opportunity to join the core team of a growing successful startup and work with the most advanced technologies.
Responsibilities
Lead/Participate in system design and architecture discussions.
Implement and own infrastructure and features; be involved and impact the entire product lifecycle (concept, design, test, release, and production support).
Teach, mentor, grow, and provide advice to other domain experts, individual contributors.
Acquire an in-depth understanding of our technical challenges and strive to improve them.
Play a central role in technical, business, and organizational contributions.
Be a vocal advocate for technical excellence and help the team members make sound decisions.
Work with product managers, data scientists, and other team members to understand the desired requirements and provide your feedback to improve the outcome of the feature.

Our technology eases the stress of paying for lifes expenses by giving people more options on how and when they pay. Founded in 2016, offers a next-generation, no-fee credit card that can be managed through a powerful mobile app, as well as a point-of-sale payment option available at more than 16,000 service locations, including auto dealership service centers, optical practices, dentist offices, veterinary clinics, and specialty healthcare services. included on the 2022 Inc. 5000 list.

The financial technology company has also been named a Most Loved Workplace, Best Point of Sale Company, and a Top Fintech Startup by CB Insights. We use cutting-edge innovations in financial technology to bring leading data and features that allow individuals to be qualified instantly, making purchases at the point of sale fast, fair, and accessible for consumers from all walks of life. We create value focused on our core values; we work tirelessly to ensure that becomes available to everyone, everywhere.

About the Fraud Prevention Squad:
The Fraud Prevention Squad is a highly skilled and collaborative team of engineers, data scientists, and analysts working to develop cutting-edge fraud detection and prevention systems. The team is passionate about building secure financial products and fosters a culture of learning and mentorship, where everyone is encouraged to share their expertise and grow their skills.

What Youll Do:

As a Senior Backend Engineer on Fraud Prevention Squad, you will play a key role in ensuring the integrity and security of our product offerings. Your main responsibility will be to design, build, and enhance advanced backend systems to detect, prevent, and manage fraudulent activities across all products. You will collaborate with a multidisciplinary team of engineers, data scientists, and data analysts to develop effective fraud prevention strategies and tools. Additionally, you will continuously improve existing technologies, integrate fraud prevention measures seamlessly into our products, and provide mentorship to junior engineers.

Key Responsibilities:
Contribute to the development of our Fraud Prevention Platform, ensuring high-quality products and services.
Solve complex architectural problems, utilizing your deep understanding of system architecture.
Collaborate with other team members, sharing your expertise and facilitating a culture of learning.
Maintain our system architecture, ensuring smooth operation and quality user experience.
Be an advocate for clean, efficient, and maintainable code.
Provide mentorship to junior team members, nurturing their growth and development.

a global technology company making life-changing financial products and services available to more people nationwide, as it reshapes the financial services ecosystem. By using machine learning, a vast data network and a sophisticated AI-driven approach, provides comprehensive consumer credit and residential real estate solutions for its partners, their customers, and investors. Its proprietary API and capital solutions integrate into its network of partners to deliver seamless user experiences and greater access to the mainstream economy. has offices in New York and Tel Aviv. For more information

About the Role
We are looking for a talented Backend Engineer to join our core engineering team working on our flagship producta critical, high-availability backend system serving numerous external partners. In this role, you'll play a key part in continuously refactoring, decoupling, and scaling our production services, ensuring exceptional reliability, performance, and scalability. This position is ideal for engineers passionate about designing and maintaining robust, production-grade software, and who enjoy the challenge of systematically decomposing complex systems into smaller, maintainable components.

Responsibilities
Own and evolve our backend APIs ensuring they are scalable, well-documented, and performant.
Design and implement robust backend services that handle high traffic and complex data interactions.
Improve system architecture by identifying bottlenecks and optimizing performance.
Collaborate with cross-functional teams including frontend, DevOps, and product teams to deliver high-quality features.
Enhance API integrations with partners, ensuring seamless data exchanges and reliability.
Implement best practices for code quality, testing, CI/CD, and security.
Fostering a culture of technical excellence and knowledge sharing.
Develop, optimize, and maintain critical production backend services for our flagship product.
Continuously refactor and decouple large backend systems into smaller, modular, and scalable components.
Design, implement, and document reliable, performant APIs consumed by dozens of external partners.
Monitor, debug, and maintain the health and availability of our production environment.

Required Senior Backend Engineer - Bazel team
Job Description
Building our 3000 microservices and 32M lines of code requires high-scale CI/CD. Bazel is our build tool of choice and we front its Scala integration and work on building additional sophisticated features, world-class pipelines, and highly scalable services to support them. We do hardcore backend engineering and specialize in Bazel, its tooling, and integrations.
We also work closely with the developers to improve their day-to-day experience and eliminate velocity killers, from their IDE to GA.
As an engineer in the Bazel team, youll:
Build and maintain tooling that helps our developers build and deliver code faster
Build, and maintain highly scalable backend services providing unique CI/CD experiences to support our backend code.
Work as a part of the Bazel OSS community, participate in discussions and workgroups and help shape Bazel itself.

The Data-Nexus team, a central part of the R&D department, is seeking a versatile Senior Backend Engineer to take part in leading data vision using a lake-house architecture, and building high-scale solutions for handling and consuming the different data assets of the company.
In this role, building on the foundation of classic backend development, youll go beyond traditional boundaries, taking on full product responsibilitiesfrom conceptualization and architecture to design, maintenance, and continuous development. You will collaborate closely with stakeholders across the company to ensure our solutions effectively meet their needs.
The ideal candidate will have strong backend development capabilities, with a deep understanding of designing and managing AWS cloud infrastructure, along with strong knowledge of different data architectures, methods and tools.
Responsibilities:
Design and development of scalable, reliable backend systems and data infrastructure for innovative AI-driven applications.
Collaborate with cross-functional teams, including data scientists, data analysts, product managers, regulatory teams, and other developers, to drive the development of new tools and features that support mission.
Write and manage Infrastructure as Code (IaC) using Terraform and AWS CDK, ensuring robust and efficient cloud infrastructure.
Take ownership of the full development lifecycle, including requirement gathering, design, implementation, testing, deployment, and ongoing maintenance.
Engage with stakeholders to understand their needs and translate them into technical requirements and product features.
Maintain and improve existing backend systems, ensuring they are optimized for performance, security, and cost-efficiency.
Explore and adopt new technologies and frameworks that can enhance the capabilities of the Data-Nexus team.
Develop and maintain high-quality, scalable, and efficient code while fostering a culture of continuous improvement through regular retrospectives and knowledge sharing.

As a Senior Backend Engineer, youll work within our core R&D center as a member of our Backend Team. Youll design, develop, implement, maintain and troubleshoot in a cutting-edge environment. Within our infrastructure, youll focus on building optimized, scalable and innovative designs.

What You'll Do:
Be responsible for implementing microservices from design to production.
Take ownership of development, maintenance, testing strategy, design discussions, and operations.
Participate in all aspects of agile software development including design, implementation, and deployment.
Responsible for the end-to-end lifecycle of new product features / components
Ensuring application performance, uptime, and scale, maintaining high standards of code quality and thoughtful application design
Research and suggest new technologies for boosting the product.
Have an impact on product development by making important technical decisions, influencing the system architecture, development practices and more.

Were looking for a Senior Backend Data Engineer to design and optimize high-performance infrastructure capable of handling massive data volumes. In this role, youll lead backend development, architect scalable data pipelines, and ensure seamless data processing. Your expertise in distributed systems and performance optimization will drive innovation, transforming intricate security challenges into efficient, resilient solutions.
Responsibilities:
Be a significant part of the development of backend infrastructure to efficiently handle, process, and store vast volumes of data.
Architect and build a scalable, high-performance backend system that supports various services within the platform.
Translate intricate requirements into meticulous backend design plans, maintaining a focus on software design, code quality, and performance.
Collaborate with cross-functional teams to implement backend and data-handling techniques.
Apply your expertise to create robust backend solutions.
Leverage your proficiency in cloud platforms such as AWS, GCP, or Azure to drive strong backend engineering practices.
Demonstrate strong debugging skills, identifying issues such as race conditions and memory leaks within the backend system. Solve complex backend problems with an analytical mindset and contribute to a positive team dynamic.
Bring your excellent interpersonal skills to foster collaboration and maintain a positive attitude within the team.

Were looking for a skilled Scala developer with a strong background in distributed systems to join our team. Youll be working on the core backend of us/iAds ad-serving platform, powering ads for millions of daily users.
In this role, youll help improve our system's performance, scalability, and reliability. Youll work with cutting-edge technologies like Kafka, Aerospike, and Kubernetes, contributing to a platform that drives a significant part of the company's revenue.

This is an exciting opportunity to deeply impact our business, working within a team that sits at the heart of our backend systems.

What you'll be doing:
Develop features in a high-scale, real-time environment.
Work on critical projects at the core of our revenue stream.
Propose and implement new ideas to enhance system functionality and performance.
Help design and build robust and scalable solutions.