Senior Backend Software Engineer (m/f/n)

🏢 Summary: Senior Backend Developer (remote, 12-month contract) focused on building scalable data processing systems and robust data pipelines. The role involves designing system architecture, coding for scale, and collaborating across teams while experimenting with new technologies and MVPs. 🗂️ Requirements: BSc in Software Engineering, Computer Science or related field, 5+ years of experience with Python, Hands-on experience with data pipelines, Experience designing scalable system architectures, Experience in backend software development 📃 Skills: Python, AWS, CI/CD, DevOps, SQL, ElasticSearch, OpenSearch, Neptune, Neo4j 🏢 Description: Start: ASAP Work model: Remote Length of contract: 12 months + extensions We’re looking for a Senior Backend Developer with a data pipeline emphasis with a strong understanding of and hands-on experience with broad software development, i.e., system architecture, coding for scale, and communicating possibilities for what can be built and maintained, as well as a love for experimenting and building MVPs. Core Responsibilities: Design and implement software architectures for scalable data processing systems. Develop and maintain data pipelines for efficient data ingestion and processing. Collaborate with cross-functional teams to define and streamline software development processes. Participate in code reviews and maintain high software quality standards. Experiment with new technologies and frameworks to enhance system performance. Key Requirements: BSc in Software Engineering, Computer Science, or other relevant field 5+ years of experience with Python Experience with data pipelines Nice to Have: Experience with one or more AWS services AWS DevOps CI/CD Pipelines Relational databases ElasticSearch/OpenSearch Graph databases (e.g., Neptune or Neo4j)

🏢 Summary: Remote B2B opportunity for a Senior Backend Engineer to design and develop scalable microservices-based backend systems using Java and Spring Boot in a cloud environment. The role focuses on building REST APIs, integrating messaging systems, and ensuring high availability, security, and scalability of distributed systems. The project is expanding and requires experienced engineers to support its growing scale. 🗂️ Requirements: Minimum 5 years of experience in backend development with Java, Very good knowledge of Java 17 or newer (preferably Java 21), Practical experience with Spring Boot and Spring ecosystem (Spring Security, Spring Data, WebFlux or MVC), Experience in designing and developing distributed systems and microservices, Experience with asynchronous communication tools (Kafka or RabbitMQ), Very good knowledge of PostgreSQL and SQL, Experience in designing and integrating REST APIs, Practical knowledge of AWS or GCP cloud environments, Experience with Docker and Kubernetes, Knowledge of application security, including data encryption, token handling, and PCI-DSS basics, Communicative English level 📃 Skills: Java, Spring, SpringBoot, SpringSecurity, SpringData, WebFlux, MVC, Kafka, RabbitMQ, PostgreSQL, SQL, REST, AWS, GCP, Docker, Kubernetes, Microservices, PCI-DSS 🏢 Description: Dla naszego klienta z branży logistycznej poszukujemy dwóch doświadczonych Senior Backend Engineerów, którzy dołączą do zespołu rozwijającego nowoczesne rozwiązania backendowe w środowisku opartym o architekturę mikroserwisową oraz technologie chmurowe.Rekrutacja wynika z rozwoju projektu i potrzeby zwiększenia jego skali. Lokalizacja: praca zdalna oraz raz na kwartał spotkanie w Krakowie Forma współpracy: B2B Stawka: do 170 PLN/h Język angielski: minimum poziom komunikatywny Zakres obowiązków Projektowanie, rozwój i utrzymanie aplikacji backendowych opartych o Javę i Spring Boot Tworzenie oraz rozwijanie architektury mikroserwisowej Projektowanie i implementacja interfejsów REST API Integracja systemów z wykorzystaniem brokerów wiadomości Współpraca przy projektowaniu rozwiązań zapewniających wysoką dostępność i skalowalność systemów Udział w procesach związanych z bezpieczeństwem aplikacji oraz ochroną danych Współpraca z zespołami produktowymi, architektami oraz innymi zespołami technologicznymi Wymagania Minimum 5 lat doświadczenia zawodowego w tworzeniu aplikacji backendowych w języku Java Bardzo dobra znajomość Java 17 lub nowszej wersji (preferowana Java 21) Praktyczne doświadczenie z frameworkiem Spring Boot oraz komponentami ekosystemu Spring (Spring Security, Spring Data, WebFlux lub MVC) Doświadczenie w projektowaniu i rozwijaniu systemów rozproszonych oraz mikroserwisów Znajomość narzędzi do komunikacji asynchronicznej, takich jak Kafka lub RabbitMQ Bardzo dobra znajomość PostgreSQL oraz języka SQL Doświadczenie w projektowaniu i integracji REST API Praktyczna znajomość środowisk chmurowych AWS lub GCP Doświadczenie w pracy z Dockerem oraz Kubernetesem Znajomość zagadnień związanych z bezpieczeństwem aplikacji, w tym szyfrowaniem danych, obsługą tokenów oraz podstawowych wymagań PCI-DSS Komunikatywna znajomość języka angielskiego Mile widziane Doświadczenie zdobyte w branży fintech, płatności lub e-commerce Znajomość standardów PCI-DSS, PSD2 lub ISO 8583 Doświadczenie w pracy z rozwiązaniami opartymi o modele językowe (OpenAI, Anthropic lub podobne) Znajomość zagadnień związanych z RAG, Prompt Engineering, Tool Use lub innymi wzorcami Agentic AI Doświadczenie w integracji systemów płatniczych, widgetów lub SDK

🏢 Summary: Senior Backend Engineer role focused on designing and developing scalable, reliable backend services using Java. The position involves working in a cross-functional team to build high-performance systems, improve architecture, and support CI/CD and production environments. 🗂️ Requirements: 5+ years Backend Engineering experience, Strong Java proficiency, Solid knowledge of databases and SQL, Experience with RESTful APIs, Experience with microservices architecture, Experience with high-load systems, Experience with Docker and Kubernetes, Experience with AWS or GCP, Knowledge of CI/CD pipelines, Understanding of Agile practices 📃 Skills: Java, SQL, REST, Microservices, Docker, Kubernetes, AWS, GCP, CI/CD, Golang, Python 🏢 Description: We are looking for a Senior Backend Engineer with strong Java experience to help us design and develop scalable solutions. You will work in a cross-functional team, building reliable services and contributing to the continuous improvement of our systems. This role is ideal for someone who enjoys solving complex problems and driving technical excellence. 💼 Responsibilities: Design, develop, and maintain backend features and services. Collaborate with teams to define requirements and integrate systems. Ensure performance, scalability, and reliability of applications. Contribute to CI/CD processes and support production systems. Write clear documentation and share knowledge within the team. ✅ Requirements: 5+ years of experience as a Backend Engineer, with strong Java skills (Golang/Python is a plus). Solid understanding of databases and SQL. Experience with RESTful API design, microservices, and high-load systems. Familiarity with Docker, Kubernetes, and cloud environments (AWS/GCP). Knowledge of CI/CD pipelines and Agile practices. Strong problem-solving and communication skills. 🎁 We offer: Stable employment in a fast-growing company. Flexible and remote-friendly working model. Health and wellbeing benefits. Learning and development opportunities. Modern equipment and comfortable work environment.

🏢 Summary: Senior Backend Engineer role focused on designing and scaling a high-throughput, event-driven platform. The position centers on building and optimizing large-scale event processing services and APIs in distributed systems. It involves solving complex scalability and reliability challenges in a massive-scale environment. 🗂️ Requirements: Senior-level experience in backend development, Strong Python expertise, Experience scaling message queue systems, Experience with distributed systems and microservices architecture, Proven track record building high-throughput backend services, Experience designing scalable and fault-tolerant systems, Ability to implement and optimize APIs 📃 Skills: Python, Azure, ServiceBus, StorageQueues, EventHubs, Microservices, DistributedSystems, APIs, EventDriven, EventSourcing, Streaming, Observability, Monitoring 🏢 Description: Location: Remote Type: Full-time Level: Senior Duration: 4 months Start: ASAP We are looking for an experienced Senior Backend Engineer to join a team responsible for building and scaling a high-throughput, event-driven platform operating at massive scale. Your primary focus will be the event processing backbone — designing, developing, and optimizing services that handle large volumes of messages reliably and efficiently. You will work closely with architects and other senior engineers to implement APIs that expose data and support advanced triage and processing workflows. This role is ideal for someone who enjoys solving hard scalability problems , working with distributed systems, and building resilient backend services that operate under real-world load. Responsibilities Design and build backend services responsible for large-scale event processing Optimize and scale message-based systems to handle high throughput and reliability requirements Implement APIs defined by system architects to expose data and collect processing results Collaborate with cross-functional teams to improve platform performance and resilience Contribute to architectural decisions around scalability, fault tolerance, and observability Core Skills Strong experience with Python as a primary backend language Deep expertise in scaling message queue systems (e.g. Azure Service Bus, Storage Queues, Event Hubs or similar) Solid understanding of microservices architecture and distributed systems Proven experience building high-throughput, resilient backend services Strong problem-solving skills and ability to work with complex systems Highly Desirable Experience with event-driven or event sourcing architectures Background in data processing frameworks or streaming systems Experience building platforms related to observability, monitoring, or large-scale event management Familiarity with designing systems for fault tolerance and graceful degradation What we offer Work on technically challenging systems operating at very large scale High level of autonomy and real influence on system architecture Collaboration with experienced engineers in a mature engineering environment Competitive compensation and flexible working model Project with strong technical ownership

🏢 Summary: Senior Backend Engineer role focused on building and scaling a cloud-based SaaS platform using modern .NET services and REST APIs. The position involves designing distributed systems, improving reliability and observability, and working with cloud and container environments. You will contribute to technical decisions and engineering best practices within a collaborative team. 🗂️ Requirements: 5+ years backend development experience, Experience with SaaS and web applications, Strong knowledge of C#, Strong knowledge of modern .NET/.NET Core, Solid computer science fundamentals, Experience with distributed systems design, Experience with cloud platforms, Experience with containers and orchestration, Understanding of concurrency and performance, Knowledge of authentication and authorization mechanisms 📃 Skills: C#, .NET, .NETCore, REST, Azure, AWS, GCP, Kubernetes, Kafka, RabbitMQ, SQS, Docker, SQL, HTML, CSS, JavaScript 🏢 Description: We’re hiring a Senior Backend Engineer to help build and scale a cloud-based SaaS platform. You’ll work on modern .NET services and APIs, improve reliability and observability, and contribute to technical decisions as part of a collaborative engineering team. Responsibilities: Build and maintain backend services and REST APIs in C# / .NET (.NET Core). Design scalable solutions for distributed systems (async workflows, messaging, integrations). Work with cloud services (Azure/AWS/GCP) and container environments (e.g. Kubernetes). Strengthen system reliability with logging, metrics, tracing, and monitoring. Support secure access patterns: authentication/authorization, API gateway concepts. Contribute through code reviews, good engineering practices, and automation. Requirements: 5+ years of backend development experience, including SaaS and web applications. Strong knowledge of C# and modern .NET + solid CS fundamentals. Familiarity with containers/orchestration and cloud-native approaches. Experience with some of: Kafka/RabbitMQ/SQS, workflow orchestration, job scheduling, search. Good understanding of concurrency and performance. Strong communication skills; Agile/Scrum is a plus. Bonus: basic front-end knowledge (HTML/CSS/JS).

🏢 Summary: Senior or Staff Backend Engineer role focused on architecting and scaling AI-native backend systems for a modern accounting platform. The position involves designing distributed services, building high-performance APIs, and establishing engineering standards to support rapid, reliable product delivery. You will work closely with Product, AI, and Operations teams to develop agentic systems and scalable data pipelines. 🗂️ Requirements: 5–10+ years of backend engineering experience, Proven experience designing, building, and operating production backend systems at scale, Strong expertise in API design, Strong expertise in data modelling, Deep understanding of distributed systems trade-offs, Hands-on experience with AWS or GCP in production, Practical experience with CI/CD in high-frequency deployment environments, Experience implementing testing and deployment strategies, Strong knowledge of observability practices, Experience participating in on-call rotations 📃 Skills: TypeScript, Node.js, React, AWS, GCP, Terraform, PostgreSQL, OpenAI, Azure, CI/CD, APIs, DistributedSystems 🏢 Description: ABOUT THE ROLE We're looking for a Senior or Staff Backend Engineer to own and evolve our backend services as we scale. This is a broad, high-impact role — you'll architect new features, build the systems that underpin our core product, and set the engineering standards that shape how the whole team works. The focus is on building a modern, AI-native developer experience. That means working closely with Product, AI, and Operations teams to design agentic systems, distributed data pipelines, and scalable incident response infrastructure — and doing it in a way that lets the team ship with confidence multiple times a day. WHAT YOU'LL WORK ON Architecture and feature design Partner with Product, AI, and Operations teams to architect new features and complex agentic systems. Make clear architectural trade-offs that balance platform, product, and business goals. Backend services and APIs Build and maintain the backend services and APIs that power the core product. Ensure systems are secure, well-tested, and high performance. Distributed systems Design and implement distributed services to orchestrate data pipelines, automate investigations, and enable incident response at scale. Operational excellence Own operational best practices so the team can ship multiple times a day with confidence. Healthy on-call culture and strong observability are part of what you'll build and maintain. Engineering standards Set the bar for writing, communication, and system design across the team. Your influence will shape how a modern AI-native product is built. WHAT WE LOOK FOR 5–10+ years of backend engineering experience A strong track record designing, building, and operating production backend systems at scale. Deep backend fundamentals Expertise in API design, data modelling, and reasoning about distributed systems trade-offs. You understand the nuances, not just the patterns. AWS or GCP hands-on experience Solid understanding of how infrastructure decisions impact application reliability and performance. You've run things in production, not just designed them. CI/CD in practice Practical experience with testing and deployment strategies in high-frequency shipping environments. Observability and on-call maturity A solid grasp of what good observability looks like and how to build healthy on-call practices that don't burn people out. Bonus Experience at an early-stage or scaling startup. Exposure to modern AI and ML systems. Experience shipping product without a dedicated product manager. TECH STACK TypeScript, React, Node.js, AWS, Terraform, PostgreSQL, OpenAI, Azure AI. The team uses GitHub, Slack, Linear, Figma, and Notion day to day. THE TEAM Small, senior, and in-person. The office is in central Wrocław, next to the main train station. The expectation is 4–5 days a week in the office. Relocation support is available for the right candidate. COMPENSATION & BENEFITS Salary $130,000 – $190,000 USD depending on experience, plus competitive equity. Wellness and commute stipend $100 per month. Hardware Premium hardware provided — MacBook Pro and AirPods. Food Daily in-office lunch and dinner. Time off 20 PTO days plus 9 US public holidays. Relocation Support available for candidates relocating to Wrocław.

🏢 Summary: Senior Software Engineer responsible for defining technical standards and architecture, leading backend and frontend development, and ensuring secure, scalable, and observable solutions. The role drives CI/CD, enterprise integrations, and production support while aligning engineering practices with product and operations goals. 🗂️ Requirements: Proven experience defining technical standards and architecture, Experience with CI/CD orchestration, Experience with observability implementation, Experience implementing on-premises, hybrid, and cloud solutions, Experience leading backend and frontend architectural decisions, Experience maintaining CI/CD pipelines, Experience coordinating enterprise integrations, Knowledge of DDD and clean architecture, Expertise in Java and Spring Boot, Expertise in Python and FastAPI, Expertise in React or Angular, Experience with L2/L3 production support, Experience with Spring Security and OAuth 📃 Skills: Java, SpringBoot, Python, FastAPI, React, Angular, CICD, Observability, ServiceNow, Jira, Boomi, DDD, OAuth, SpringSecurity 🏢 Description: To strengthen the team, we are seeking a person for the role of Senior Software Engineer, responsible for defining technical standards and architecture, guiding the development team, ensuring quality practices, security, and CI/CD, and collaborating with product and operations in delivering scalable, business-aligned solutions. Main Responsibilities Define technical standards, architecture, and development practices, ensuring quality, security, performance, and resilience in production environments. Orchestrate end-to-end delivery with CI/CD and observability while promoting responsible autonomy among teams aligned with product and operational objectives. Implement on-premises, hybrid, and cloud solutions with security best practices, observability, and integration with existing systems. Lead architectural decisions in backend and frontend (Java/Spring Boot, Python/FastAPI, React/Angular), ensuring scalability, consistent testing and code reviews. Implement and maintain end-to-end CI/CD pipelines and observability (logs, metrics, distributed tracing). Coordinate enterprise integrations (ServiceNow, Jira, CRMs) and iPaaS (e.g., Boomi), including mapping, validation, and compliance. Apply practices such as DDD, clean architecture, application security, and secrets/IAM management throughout the development lifecycle. Provide technical guidance to the team, elevate quality standards, and align practices with product and operations. Lead L2/L3 support in production: incident triage and resolution, prevention escalation (on call), SLA management, and conducting post-mortems focused on root causes and corrective actions. Operate and evolve applications in on-premises, hybrid, or cloud environments: VMs, networks, VPNs, certificates, Nginx/reverse proxy, load balancing, and enhancing the security of exposed services. Key Requirements Proven ability to define technical standards, architecture, and development practices. Experience with CI/CD orchestration and observability practices. Knowledge of implementing on-premises, hybrid, and cloud solutions with security best practices. Leadership in architectural decisions for backend and frontend technologies. Experience with maintaining CI/CD pipelines and end-to-end observability. Ability to coordinate enterprise integrations and ensure compliance. Mastery of practices such as DDD and clean architecture. Technical expertise in Java/Spring Boot, Python/FastAPI, React/Angular. Experience in providing L2/L3 technical support and leading incident resolution. Expertise in security practices, including Spring Security and OAuth. Nice to Have Experience with Docker, Kubernetes, and cloud environments (Azure/AWS/GCP). Background in data management with PostgreSQL, MongoDB, and Redis. Familiarity with AI models, particularly RAG. Knowledge in security access management and policies based on the principle of least privilege.

🏢 Summary: Senior Backend Developer role focused on building secure, scalable backend systems for a battlefield management platform using Kotlin and Java. The position emphasizes security-first development, cloud deployment on GCP, and ownership of architecture, CI/CD, and dependency vulnerability management. You will ensure high reliability, performance, and compliance with strict security standards. 🗂️ Requirements: 6+ years of backend development experience, Advanced Kotlin knowledge, Advanced Java knowledge, Strong experience with Spring Framework, Expertise in Spring Boot, Expertise in Spring Security, Experience implementing authentication and authorization, Strong understanding of OWASP principles, Experience with encryption and secure coding practices, Experience with OWASP Dependency-Check Maven Plugin, Hands-on experience with Google Cloud Platform, Experience with Kubernetes on GCP, Experience with Cloud Storage and Compute Engine, Experience designing and managing CICD pipelines, Proficiency with GitHub version control 📃 Skills: Kotlin, Java, Spring, SpringBoot, SpringSecurity, OWASP, Encryption, Maven, DependencyCheck, GCP, Kubernetes, CloudStorage, ComputeEngine, GitHub, GitHubActions, CICD, Docker, Prometheus, Grafana, ELK, APIs, Git 🏢 Description: About the Role: We are seeking an experienced Senior Backend Developer with a minimum of 6+ years of expertise in developing backend systems using Kotlin and Java . This role involves working on a battlefield management system , requiring strong security-focused development, robust architecture design, and seamless integration with cloud-based infrastructure. The position demands advanced English skills and a high level of independence , enabling you to drive the development process from concept to delivery . Military experience or prior involvement in the development of military systems is a plus but not mandatory. As a critical contributor, you will ensure the reliability, security, and performance of our systems, with particular emphasis on monitoring and mitigating vulnerabilities in system dependencies. Key Responsibilities: Backend Development: Build and maintain scalable backend systems and APIs using Kotlin/Java and Spring Framework . Security Implementation: Ensure all systems meet stringent security standards, including data protection, authentication, and authorization protocols. Dependency Management: Regularly check for and scan for vulnerabilities in dependencies using tools like the OWASP Dependency-Check Maven Plugin , and mitigate identified risks promptly. Cloud Integration: Deploy and optimize backend services on Google Cloud Platform (GCP) . DevOps Practices: Design and manage CI/CD pipelines. Optimize repository workflows using Github . Collaboration: Coordinate with cross-functional teams, including frontend developers and system architects, to deliver robust solutions. System Optimization: Continuously refine and enhance system performance for battlefield-level reliability. Documentation: Produce clear and detailed documentation for architecture, code, and security processes. Required Skills & Experience: Kotlin/Java & Spring Framework: Advanced knowledge of Kotlin/Java (6+ years preferred). Expertise in Spring Boot, Spring Security , and related modules. Security Expertise: Strong understanding of OWASP , encryption, and secure coding practices. Dependency Management: Familiarity with tools like OWASP Dependency-Check Maven Plugin to scan and mitigate dependency vulnerabilities. Cloud Expertise: Hands-on experience with Google Cloud Platform services like Kubernetes, Cloud Storage, and Compute Engine. DevOps & CI/CD: Proficiency in managing pipelines with tools like GitHub Actions or similar. Experience with GitHub for version control. Independent Work: Demonstrated ability to work autonomously and deliver high-quality results. Advanced English Skills: Excellent verbal and written communication skills. Preferred Qualifications: Previous experience developing systems or products with high security requirements. Certification in Google Cloud Platform technologies. Proficiency with containerization tools like Docker and orchestration frameworks such as Kubernetes . Familiarity with monitoring and logging tools (e.g., Prometheus , Grafana , or ELK Stack ). What We Offer: Competitive salary and comprehensive benefits. Opportunities for professional development and certification. The chance to work on impactful, high-stakes systems. Flexible working hours and [remote/hybrid] options.

🏢 Summary: Senior Backend Engineer role focused on defining the technical direction and architecture of a domain within a borderless financial platform. The position involves designing scalable microservices, driving architectural decisions, and leading a small backend team in a distributed environment. The role emphasizes reliability, security, and high‑volume transaction processing in a cloud-based ecosystem. 🗂️ Requirements: 4-7 years backend engineering experience, Proficiency in Go, Experience with Java 21 or modern Java, Experience designing microservices with clear contracts, Experience with caching strategies including TTL and invalidation, Experience with event-driven or asynchronous architectures, Experience with structured logging, metrics, and alerting, Experience with AWS services, Experience with relational and non-relational databases, Experience with Spring Boot or similar frameworks, Experience reviewing code and architectural decisions, Availability to work in GMT+5:30 timezone 📃 Skills: Java, Go, Spring, JDBI, PostgreSQL, CockroachDB, DynamoDB, Redis, SQS, SNS, Kafka, AWS, EKS, ALB, RDS, S3, Kong, Datadog, Quickwit, JWT, RBAC, TLS, Docker, ArgoCD, GitHub, Microservices, Kafka, CDC 🏢 Description: Project overview This project focuses on developing a borderless financial platform that supports international banking flows, payments, account management and regulatory compliant operations. The product handles sensitive data and high volume transactions while prioritising reliability and security. Team You will work in a distributed environment with backend engineers, a product manager and platform specialists. The role involves leading a sub team of three to five engineers, conducting design reviews, ensuring code quality standards and supporting collaborative decision making. Position overview We are looking for a Senior Backend Engineer who will define the technical direction of a backend domain and drive architectural decisions. You will design microservices, create scalable solutions, guide a small engineering group and collaborate closely with product specialists to shape the delivery roadmap. We are looking for a person willing to work in the time zone: GMT+5:30. Technology stack Java 21, Go, Spring Boot, JDBI, custom workflow engines, PostgreSQL, CockroachDB, DynamoDB, Redis, SQS, SNS, Kafka, AWS EKS ALB RDS S3 Secrets Manager, Kong API Gateway, Datadog, Quickwit, JWT RBAC TLS request and response encryption VAPT, GitHub Actions, Docker, ArgoCD, microservices, event driven architecture, saga and orchestration patterns, CDC pipelines, maker checker workflows Responsibilities Plan and design backend microservices with clear boundaries and contracts Develop solutions for domains such as onboarding, payments, transaction orchestration or platform components Break complex epics into actionable tasks with clear acceptance criteria Review designs from other engineers to ensure scalability and fault tolerance Drive technical decisions including caching layers, asynchronous processing strategies, database choices and API versioning Evaluate build versus buy options for integrations and services Collaborate with a product manager to align on scope and prioritisation Lead a sub team of backend engineers and support their professional growth Support incident response, root cause analysis and long term improvements Monitor service performance using logging, metrics and tracing tools Requirements Professional backend engineering experience from 4-7 years Experience with Go (tooling & CLIs) Experience designing microservices with well-defined contracts and boundaries Experience with Java 21 or modern Java versions Experience with caching strategy design, including TTL and invalidation approaches Experience working with asynchronous processing, event-driven architecture, or queue-based workflows Experience using structured logging, metrics, and alerting to debug production systems Experience in making build versus buy decisions with clear trade-off analysis Experience reviewing code and identifying architectural or contract issues Experience with AWS-based services Experience working with relational and non-relational databases such as PostgreSQL or DynamoDB Experience writing backend services using Spring Boot or similar frameworks Nice to have Experience with financial or payments related systems Experience with KYC or AML flows Experience with workflow or orchestration engines Experience with platform wide pattern creation or reusable service design Experience with data encryption practices and security audits Experience with CockroachDB or high availability distributed databases What We Offer: Vacation days : Up to 26 business days per year. 10 illness/special days off per year (fully paid, no medical papers needed) for all contract types Health and life insurance (Luxmed) MyBenefit platform with Multisport option Internal psychological support service English language classes from the first working day Access to external learning platforms : O’Reilly, LinkedIn Learning, Udemy, and a wide catalog of diverse internal training Flexible workplace : work from the office, from home, or choose a hybrid option Tech Skills Mentoring Program Opportunities to develop as a public speaker, mentor, or technical interviewer Fully paid idle (bench) when not involved in a project Certification reimbursement (AWS, GCP, Microsoft, etc.)

🏢 Summary: Backend Software Engineer role focused on building and evolving core services for a scalable, microservices-based IoT platform managing millions of devices globally. The position involves designing, developing, and maintaining high-performance backend systems in a cloud-native, distributed environment. You will contribute across the full software development lifecycle, including architecture, deployment automation, and reliability improvements. 🗂️ Requirements: Proficiency in at least one JVM language (Java or Scala), Understanding of secure software development (authentication, authorization, data handling), Knowledge of data storage and caching (MongoDB, Redis), Ability to write clean, production-grade backend code, Basic understanding of cloud-native environments (containers, CI/CD, Kubernetes), Experience with backend service design and distributed systems concepts 📃 Skills: Java, Scala, JVM, MongoDB, Redis, Kubernetes, CI/CD, Containers, REST, Microservices, Cloud, Authentication, Authorization, Caching, AI 🏢 Description: Software Engineer (Backend) Join the team responsible for developing and maintaining Coiote DM – a scalable, microservices-based platform used to remotely manage millions of IoT devices worldwide. Our system enables secure device provisioning, monitoring, firmware updates, and large-scale device lifecycle management. We work with modern backend technologies, cloud infrastructure, and distributed systems to ensure high performance, scalability, and reliability. We are looking for a Regular Software Engineer (Backend) to join our team and help us build and evolve core backend services powering the platform. Requirements: Good understanding of at least one JVM language (Java or Scala) Understanding of secure software development (authentication, authorization, data handling) Knowledge of data storage and caching (e.g., MongoDB, Redis) Writing clean, maintainable, production-grade backend code using modern AI assistance Basic understanding of cloud-native environments (containers, CI/CD, Kubernetes) English (B2+) and Polish (C2- we speak Polish on a daily basis) A huge plus if you have: Awareness of infrastructure (for eg. service discovery, networking, circuit breaking, retries, routing, K8s, VMs, CI/CD) ISO/OSI model (basic networking knowledge) Practical understanding of REST APIs, service integration patterns, event driven and distributed architectures Using logs, metrics, traces, dashboards for debugging and analyses Responsibilities: Participate in the full software development lifecycle: design, development, code review, testing, deployment, and maintenance Design and implement scalable and reliable service infrastructure Build and improve deployment automation and CI/CD pipelines Collaborate with product and customer-facing teams on technical analysis, PoCs, and custom adaptations Support other engineers through code reviews, feedback, and mentoring (especially junior team members) Contribute to improving engineering practices, technical standards, and system architecture Work model: Hybrid work model Mandatory onboarding period (first 3 months): at least 3 days per week in the office What we offer: Work on a large-scale IoT platform used globally Real impact on architecture, performance, and product quality Close collaboration with experienced engineers Space for initiative and technical ownership Opportunity to grow in backend, cloud, and distributed systems Flexible working hours Equipment of your choice (MacBook Pro / ThinkPad) Team with strong engineering culture and a good sense of humor Onsite gym and chillout space Multisport card Medical care Kitchen full of snacks and treats (including Good Lood ice cream) Car parking area and bike room A relaxed work atmosphere – no dress code, no open space