לוח משרות דרושים Senior Backend Developer בתל אביב יפו

Justt helps many of the world’s largest and most recognizable brands turn chargebacks from a constant headache into a managed, predictable part of doing business. Our AI-driven platform powers chargeback operations at scale, automating disputes end to end, recovering revenue that would otherwise be lost, and removing a major operational burden from finance, risk, and operations teams across multiple regions and verticals. We’re a global company with teams across markets, and disciplines, working closely with leading players in the payments ecosystem. Our culture is built on clear thinking, collaboration, and a strong sense of ownership. At Justt, you’ll partner with product, engineering, data, success and go-to-market teams to build technology that sits at the core of modern payments, and has a direct, measurable impact on the bottom line for some of the biggest companies in the world. About the Role Justt is seeking a Senior Software Engineer to join the Justt team, which is responsible for the core of Justt's chargeback resolution platform. This role involves managing our central data pipeline, from ingesting chargeback data from Payment Service Providers (PSPs) to submitting dispute responses back to them. This position offers more than standard integrations; you will be tasked with designing and scaling the infrastructure for mission-critical data flows, addressing complex issues in distributed systems, API orchestration, and data integrity. Key Responsibilities
* Own the full lifecycle of PSP integrations and data pipeline systems
* Architect scalable backend services using Node.js, TypeScript, and NestJS
* Ensure data integrity across PostgreSQL and MongoDB at scale
* Drive architectural decisions and system design within our Nx monorepo
* Mentor team members and contribute to engineering best practices What We Offer
* Solve complex technical problems with real impact
* Engineering-driven culture with talented peers
* Significant ownership over architecture and product
* Modern stack: Node.js, TypeScript, NestJS, Nx, PostgreSQL, MongoDB, AWS
* Growth opportunities in a fast-paced fintech company

We are looking for a Senior Software Engineer with a strong backend orientation who excels at solving complex challenges and is passionate about building robust, scalable, and data-driven systems. In this role, you will work closely with a talented team of engineers, Product, Design, and Data Science to deliver innovative solutions that have a meaningful impact on users' lives.
As a senior engineer, you will take ownership of projects from concept to deployment in a fast-paced, highly collaborative environment. Youll focus primarily on backend development, with the ability to contribute to frontend work as needed. Youll also mentor team members and help drive technical excellence.
Our Technology Stack:
Python, Node.js, React Native, Redux, ReactJS, Scala, Play, Microservices, AWS, Docker, Kubernetes, MongoDB, Redis, PostgreSQL, Spark, Elasticsearch, Vector DBs, Kafka, and more.
Responsibilities:
Backend Development: Design, implement, and maintain scalable, efficient, and secure backend services, with a focus on Python and Node.js.
Data Infrastructure: Work with real-time data systems, including Elasticsearch, Vector Databases, and other high-performance storage and retrieval tools.
End-to-End Feature Development: Deliver features across the stack, integrating frontend and backend components.
Collaborate with Data Science to integrate advanced algorithms and ML models into production systems.
Partner with Product Managers and Designers to brainstorm and execute impactful product features.
Ensure system architecture is reliable, maintainable, and built for scale.
Lead by example: contribute to code reviews, mentor peers, and foster engineering best practices.
Stay up to date with emerging technologies and suggest ways to apply them for performance and scalability improvements.

We are looking for an intellectually curious Senior Backend Engineer who is passionate about code, high performance and cares about quality. You will work with knowledgeable and experienced developers with a large scale of skills and capabilities who are passionate about developing an innovative product which makes an impact.
As a Backend Engineer, you will join a small team of experienced and highly talented engineers, and help us build great services for a product that actually saves lives by taking lead, work with a variety of technologies and projects.
You will work on the core of our infrastructure and backend services, where large volumes of medical data and end-user behavior are processed and built into efficient services that can scale as fast as we do. Focusing on mission critical services that are responsible for handling the business and revenue operations with complex behaviour and external integrations supporting evolving business needs and new initiatives.
Our tech-stack: Scala, Javascript + Typescript, Kafka, Kafka Streams, MongoDB, PostgreSQL, Redis, AWS, Kubernetes, Nginx, Docker, Jenkins, ELK, Prometheus and more!

Were looking for an experienced backend developer whos comfortable owning end-to-end features from data modeling to API development. Youll work closely with the team leader and take part in building smart, scalable systems that power everything from dashboards to AI-driven insights.
About Us
Were a startup team with the mindset and pace to match recently acquired by Partnerize, a global leader in partnership marketing technology. Now, were building our R&D center in Tel Aviv focused on AI, data innovation, and product automation.
Our platform helps some of the biggest brands in the world including many in the Fortune 500 make smarter marketing decisions by transforming raw data into actionable insights. We work with big data, build AI agents, and turn manual workflows into intelligent systems that drive real impact.
Backed by an experienced global team and trusted by top-tier clients, were at an exciting moment the kind where you can join early, move fast, and help shape whats next.

What Youll Do
Were looking for an experienced backend developer whos comfortable owning end-to-end features from data modeling to API development. Youll work closely with the team leader and take part in building smart, scalable systems that power everything from dashboards to AI-driven insights.
This is a hands-on role where youll write real code, influence product decisions, and work side-by-side with a sharp group of developers, data people, and product leads.
Your Day-to-Day Will Include
Building APIs and services using NestJS and TypeScript
Working with SQL and MongoDB to manage large-scale structured and semi-structured data
Writing efficient queries and optimizing backend performance
Using AI to solve real product and data problems this isnt about building tools for others; its core to what we do
Collaborating daily with colleagues in Israel and abroad (good English required)
Reporting directly to the team leader and having full ownership over your projects.

Were building a direct-to-consumer payments platform that powers web stores and in-app purchases for many of the worlds top-grossing mobile games. Our team is growing quickly as we help game studios increase revenue, deepen player relationships, and streamline their payment operations.
As a Senior Software Engineer, youll play a key role in developing the core payments platformoptimizing routing flows, ensuring transaction security, managing refunds, and integrating with a wide range of global payment gateways. Youll work with digital wallets, credit options, and region-specific solutions, implement fraud-detection capabilities, handle the full chargeback lifecycle, and contribute to building our analytics data lake.
Responsibilities:
Building our high scale cloud-based payments platform in Node.js
Have end to end ownership: Design, build, ship, measure and maintain low latency, high availability and high performance services
Bring your unique experience - we are open to new ideas and expect you to bring our team and platform to a new level
Optimize resource usage (database, infrastructure, integrations)
Mentor and guide software engineers and help build a professional and effective team

Cortex is expanding. We have the pace of a startup and the resources of the worlds cybersecurity leader. We have hundreds of petabytes of data, waiting for you to process, analyze, and apply your magic to it.
We are looking for an experienced backend engineer, who will join a team that will invent, design, engineer, and build a new set of capabilities focused on Data Analytics and Threat Detection within the top-notch Cortex platform. You will have a truly unique opportunity to influence the development of our product. You will work closely with Product Management and R&D leaders, help define the requirements, and conduct a substantial part of the technical research.
Your Impact
You will develop a product that will apply the power of the Cortex Platform to solve the challenges of cloud security, with a focus on Data Analytics and Threat Detection
You will apply your knowledge and experience of cloud development and cybersecurity to design and build and integrate new capabilities into our platform.

Were growing rapidly and looking for superstars to join our rocketship. Were looking for an experienced Backend Engineer that will help us bring permission management back to security, where it belongs. Together well build a SaaS product to serve thousands of global customers in a modern and scalable way. You will work closely with the rest of the R&D team to design, develop, and deploy high-quality software that powers our platform with cutting-edge technologies in a dynamic and agile environment. As a backend engineer, you will:

Grow and evolve as part of the R&D team!
Develop end-to-end features and systems that are used daily by key stakeholders, both internally and externally.
Investigate, implement and share new technologies and ideas.
Practice the most advanced server-side techniques available with challenging micro-services architecture, using the best technologies available: Kubernetes, Big Data Technologies (e.g. Kafka, Spark), Python.

We are looking for a Principal Backend Engineer to join our Cortex backend engineering group.
The group develops and maintains the backend of Cortex products - mainly Cortex XDR, and Cortex XSIAM. The great majority of the Cortex engineering group is located in the TLV office which allows us to operate at a high pace with short loops of decision-making.
You will join a team focused on developing, innovating, and scaling the core components of Cortex XDR, along with contributing to shared Cortex infrastructures. We are looking for candidates with a can-do attitude, who are passionate about complex problems and thrive on bringing production value to thousands of customers.
Your Impact
End-to-end backend development of features and core components across their entire life cycle (design, develop, test, deploy, maintain)
Collaborate with peers across different teams and disciplines to shape solutions and integrate with other parts of the product
Work with customers and provide solutions to their day-to-day work and challenges
Contribute to team-wide efforts - code reviews, design reviews, technical and architectural decisions.

We are looking for a Sr Backend Engineer for our Tel Aviv R&D center.
The Talon teams teams take part in the development of the Enterprise Browser, which acts as a security shield for businesses' online activity. It protects against a range of cyber threats by isolating web sessions, filtering malicious content, preventing data leaks, and centrally managing security policies. This multi-layered approach secures the organization's data, and provides superior user experience and cost structure compared to other solutions.
Were looking for a Sr Engineer that could take a leading position in the team, lead features end-to-end by creating and owning particular flows, easily ramp-up on projects old and new and deliver substantial improvements on the whole product.
More information about the Enterprise Browser can be found here.
Your Impact
Contribute significantly to feature development, participating in design, implementation, testing, and deployment
Gain experience owning specific segments of features, demonstrating accountability and commitment to quality
Actively participate in cross-functional collaboration to ensure seamless integration of product features and infrastructure
Contribute effectively to discussions, share knowledge, and learn from other teams' expertise
Contribute ideas and participate in brainstorming sessions to drive innovation within the product
Be a team player who actively supports colleagues and contributes to a positive team dynamic
Continuously seek opportunities for improvement within the team or product.

We are considering both Senior and Principal level engineers for this role.
As a Backend Developer, you will research, design, and implement cloud security products using the most up-to-date and cutting-edge technologies and frameworks, across all cloud providers (AWS, GCP, Azure, etc). You will build and be responsible for high-performance, massively scalable, always-available cloud-based systems.
Your Impact
Supercharge data security protection by developing solutions helping clients understand what kind of data they have, and across modern cloud infrastructure (e.g., Azure, AWS, GCP).
Make significant contributions to feature development by engaging in design, implementation, testing, and deployment processes
Ship innovation for microservices and scanner solutions dealing with high scale data and operations
Generate ideas and actively participate in brainstorming sessions to foster innovation within the product.

We are building the engine that powers the security validation of the worlds leading cybersecurity products. Our team is developing a complex, high-scale infrastructure that automates attack scenarios and delivers "Environment as a Service" to users across the entire company.
We are looking for a Senior Backend Engineer who is not just a coder, but a system thinker with a wide field of vision. You will be dealing with a system that touches multiple cloud, on-prem providers and services, requiring you to understand how complex distributed components interact.
You will join a group where scalability, and performance are paramount. This is a unique opportunity to build a platform used by everyonefrom Sales Engineers demonstrating our capabilities to Core Developers ensuring our products can stop the latest threats.
Your Impact
Architect and Build: You will design and develop high-performance backend microservices using Python (FastAPI) that orchestrate complex attack simulations and infrastructure setup.
Scale and Orchestrate: You will manage the complexity of parallel services and containerized components (Docker/Kubernetes/Amazon ECS/etc.), ensuring our infrastructure can handle high concurrency and massive scale.
Drive Efficiency: You will build tools that reduce testing cycles from days to hours, directly impacting the developer experience and the speed at which we release products.
Empower the Business: You will create a platform that is robust enough for developers but accessible enough for non-technical teams, directly aiding in the demonstration, marketing and sale of our products.
Data Integration: You will implement efficient data handling and storage strategies using BigQuery, MongoDB, and Redis to ensure real-time availability and historical analysis.

As a Senior Software engineer on our Email Security team, you will play a key role in shaping and delivering a cutting-edge email security solution within the Cortex platform. Your responsibilities will include designing and developing an infrastructure capable of supporting billions of events per second, collecting, storing, processing, and making them accessible, visible and actionable for users while seamlessly integrating with the industrys leading cyber-security products. You will design and build a highly available, reliable, and secure solution that adheres to the highest standards. Beyond development, your crucial role involves meaningful cross-organizational collaboration, driving a significant impact to ensure the success of our product. Our Cortex engineering group, primarily based in the TLV office, allows us to operate at a high pace with short decision-making loops. In this role, you will need to demonstrate creativity, innovation and deep knowledge in backend engineering, conducting research to find new technologies. A can-do approach, a passion for excellence and a commitment to continuous improvement are essential qualities for success in this position.
Your Impact
Huge! You shape the future! Take ownership of a brand new product, driving its development from concept and design to full implementation
Make a difference! Focus on meaningful, high impact work - No tiny tasks or endless bug fixes here! You will be building major parts of a groundbreaking new product
Conquer Scale challenges! Building a new offering designed to operate at massive scale
Lead Innovation! Dive into new cutting-edge technologies, researching and integrating them to enhance the products capabilities.

In a world where remote work is the new norm, organizations perimeters are much more loosely defined and cloud-native apps replace data centers rapidly, a new approach is needed to provide connectivity, compliance and security for all.
As a Senior Backend Engineer - you will build and design distributed backend services that are the backbone of our platform. You will need to think wide about all system components and will need to consider the trade-offs with every design decision you make.
You will work with the latest technologies and development methodologies to achieve the best outcomes. This is a unique opportunity to join very early and take charge of new product architecture and build it from scratch.
Your Impact
Responsible for complete software development life cycle including requirement analysis, design, development, deployment and support
Design, implement and test critical components in the product, take into account complex considerations of multiple platforms, performance, supportability, maintainability and much more
Write clean, testable, readable, scalable and maintainable code that scales and performs well for thousands of customers
Develop solid understanding and be able to explain advanced Cloud Computing and Security concepts to others
Research new technologies and their implications on connectivity and security. Then adapt them for use in the companys products
Write design documents, SW development guidelines, and best practices.

What You'll Do:
Your Mission. Design, develop, and execute features from concept to production that will have a huge business impact on the core products at our company.
High Impact. Ramp up the technical level of your team and cross-backend engineers, raising the overall engineering quality across the organization.
Own your mission. Develop high-priority projects that contribute to making our companys products the most scalable, high-velocity solutions on the market.
Lead. As part of a team developing a complex micro-services backend architecture, you'll work with the team and lead us towards solutions for large-scale challenges.
Dream Team. You'll join an agile dev squad of engineers who are all highly talented, very collaborative and excited to hear your opinion.
You will report to the Engineering Team Lead.
Tech Stack:
Work with a modern tech stack designed for scalability and high performance, including Golang, MySQL, PostgreSQL, Elasticsearch, Kafka, RabbitMQ, AWS SQS, AWS cloud services, Docker, and Kubernetes (K8s).

Are you ready to work on massive web projects and features that are being used by millions across the world? If yes, then youve come to the right place.
As a Backend Engineer at our company, you'll be responsible for implementing core features, building infrastructure, and finding innovative solutions while working with cutting edge technologies (Kotlin, Node.JS, Golang, Ruby, Kafka, MongoDB, Redis, ElasticSearch, Kubernetes, AWS and more). We're looking for top talent that's ready to level up their skills in an exciting and fast paced environment.
What am I going to do?
You develop it all! Including products and features.
Youll be building and developing modules, data pipelines, and services.
You own it - from design to production!