Backend Tech Lead

🏢 Summary: Senior Back-End Developer role focused on designing and building scalable, secure APIs and services for a SaaS legal-tech platform hosted on AWS. The position involves developing distributed systems, optimizing data models, and integrating multiple AWS services to support complex enterprise workflows. You will collaborate with cross-functional teams to improve performance, reliability, and architecture of the back-end systems. 🗂️ Requirements: Experience as Back-End or Full-Stack Developer in SaaS environment, Strong knowledge of Python 3.10+, Strong knowledge of Django 4.x and Django REST Framework, Experience with PostgreSQL, Experience with Redis and/or Elasticsearch/OpenSearch, Experience with Celery and asynchronous task processing, Familiarity with AWS services: ECS, Lambda, S3, RDS, SQS/SNS, Experience with Git and CI/CD pipelines, Experience working in Agile/Scrum environment, Strong debugging and performance optimization skills 📃 Skills: Python, Django, DjangoRESTFramework, PostgreSQL, Redis, Elasticsearch, OpenSearch, Celery, AWS, ECS, Lambda, S3, RDS, SQS, SNS, Git, CI/CD, Terraform, Terragrunt, pytest, Ruff 🏢 Description: About Us We build B2B legal technology that helps law firms and fund managers work faster and produce high-quality results. Our product helps manage the legal processes used when raising private investment funds. It makes drafting, negotiation, and compliance work easier and faster for lawyers. We use a single-tenant SaaS system hosted on AWS in several regions. Our technology stack includes Python/Django 4.2, React 18 with TypeScript, PostgreSQL, Redis, Elasticsearch/OpenSearch, S3, ECS, and Lambda. Role Overview We are looking for a Senior Back-End Developer to design, build, and improve the APIs, data models, and services behind our product. You will work closely with front-end developers, QA engineers, and DevOps specialists to create reliable, scalable, and secure back-end systems used by global business clients. The ideal candidate has strong experience with Python/Django, AWS services, and distributed systems. They care about performance, clean architecture, and maintainable code. Key Responsibilities Design and build RESTful APIs using Python 3.10+ and Django 4.x / Django REST Framework. Create scalable data models and efficient queries using PostgreSQL, Redis, and Elasticsearch/OpenSearch. Build background jobs and asynchronous tasks using Celery, SQS, and Lambda. Integrate AWS services such as S3, SNS/SQS, CloudFront, ECS, and RDS into application workflows. Take part in code reviews and maintain clean, secure, and well-documented services. Work with DevOps to improve CI/CD pipelines and infrastructure automation. Help plan system architecture, scalability, and performance improvements. Essential Requirements Experience working as a Back-End or Full-Stack Developer in a SaaS environment. Strong knowledge of Python 3.10+ and Django 4.x / Django REST Framework. Experience with PostgreSQL, Redis, and/or Elasticsearch/OpenSearch. Familiarity with Celery, SQS/SNS, and AWS services such as ECS, Lambda, S3, and RDS. Experience with Git, CI/CD processes, and Agile/Scrum development. Strong debugging and problem-solving skills with attention to performance and reliability. Preferred Requirements Experience with infrastructure-as-code tools such as Terraform or Terragrunt and AWS developer tools. Knowledge of authentication systems, role-based access control, and single-tenant architecture. Experience working with text or document processing libraries. Familiarity with testing and code quality tools such as pytest, Ruff, and pre-commit workflows. Personal Attributes Practical engineer who values reliability and clean system design. Analytical and detail-focused problem solver. Comfortable working and communicating in cross-functional Agile teams. Proactive in improving code quality and developer experience. What We Offer Competitive salary and benefits. Remote-first work culture with colleagues from different countries. Opportunity to shape the back-end architecture and services of our global legal-tech product. Experience working with complex enterprise workflows and automation challenges.

🏢 Summary: Offer for an experienced Backend Tech Lead responsible for defining technical direction, designing system architecture, and leading backend development in Python. The role combines hands-on coding with architectural decision-making, performance optimization, and mentoring the team. You will ensure high quality, scalability, and stability of backend systems in a production environment. 🗂️ Requirements: Minimum 6 years commercial experience in backend development, Experience in technical leadership or architectural responsibility, Very good knowledge of Python and FastAPI, Strong knowledge of PostgreSQL and SQL optimization, Experience with Redis, Practical experience with asynchronous Python, Experience designing backend architectures and APIs, Experience with automated testing using pytest, Experience with Docker and Git, Experience with CI/CD and deployment automation, Ability to debug, optimize and diagnose production issues, Experience with monitoring and log analysis, Knowledge of Atlassian tools (Jira, Confluence) 📃 Skills: Python, FastAPI, PostgreSQL, SQL, Redis, Docker, Git, pytest, CI/CD, Jira, Confluence 🏢 Description: Szukamy doświadczonego Tech Leada Backend, który poza rozwijaniem oprogramowania potrafi wyznaczać kierunek techniczny rozwoju produktu, podejmować decyzje architektoniczne oraz wspierać zespół w budowaniu wysokiej jakości rozwiązań. Poszukujemy osoby z minimum 6-letnim doświadczeniem komercyjnym w tworzeniu systemów backendowych oraz doświadczeniem w prowadzeniu technicznym zespołu lub pełnieniu roli seniora odpowiedzialnego za architekturę i standardy techniczne. Wymagania Bardzo dobra znajomość: Python; FastAPI; PostgreSQL; Redis; SQL; Docker; Git. Doświadczenie i kompetencje: doświadczenie w projektowaniu architektury systemów backendowych i podejmowaniu decyzji technicznych; bardzo dobra umiejętność debugowania, diagnozowania i optymalizacji aplikacji produkcyjnych; doświadczenie w projektowaniu API oraz modelowaniu złożonej logiki biznesowej; bardzo dobra znajomość relacyjnych baz danych oraz optymalizacji zapytań SQL; praktyczne doświadczenie z asynchronicznym Pythonem; doświadczenie w tworzeniu i utrzymywaniu testów automatycznych z wykorzystaniem pytest; wysoka dbałość o jakość, czytelność, utrzymywalność i skalowalność kodu; doświadczenie w prowadzeniu code review oraz definiowaniu standardów programistycznych; umiejętność mentoringu i wspierania rozwoju mniej doświadczonych członków zespołu; samodzielność w analizie problemów i proponowaniu rozwiązań technicznych; doświadczenie w pracy z monitoringiem, logami oraz diagnozowaniem problemów na środowiskach produkcyjnych; znajomość narzędzi Atlassian (Jira, Confluence); umiejętność efektywnej współpracy z Product Ownerami oraz innymi interesariuszami; doświadczenie z procesami CI/CD oraz automatyzacją wdrożeń. Zakres odpowiedzialności: wyznaczanie kierunku technicznego rozwoju backendu; projektowanie architektury systemu oraz podejmowanie kluczowych decyzji technologicznych; rozwój aplikacji backendowych oraz nadzór nad jakością implementacji; projektowanie i rozwój API oraz logiki biznesowej; identyfikowanie obszarów wymagających refaktoryzacji i usprawnień architektonicznych; optymalizacja wydajności aplikacji, baz danych oraz procesów backendowych; definiowanie i egzekwowanie standardów jakości kodu, testów oraz code review; diagnozowanie i rozwiązywanie złożonych problemów produkcyjnych; wspieranie zespołu w rozwiązywaniu wyzwań technicznych oraz podejmowaniu decyzji projektowych; mentoring programistów oraz rozwijanie kompetencji technicznych zespołu; współtworzenie roadmapy technologicznej oraz planowanie rozwoju systemu; dbanie o stabilność, bezpieczeństwo i utrzymywalność platformy. Mile widziane: podstawowa znajomość zagadnień frontendowych, w tym React; doświadczenie z integracjami zewnętrznymi (API dostawców, IdP/OIDC, usługi mailowe itp.); znajomość zagadnień związanych z bezpieczeństwem aplikacji webowych, w tym uwierzytelniania, autoryzacji, kontroli dostępu oraz ochrony danych. Jak wygląda praca u nas: masz realny wpływ na architekturę systemu, kierunek rozwoju technologicznego oraz standardy pracy zespołu; uczestniczysz w kluczowych decyzjach dotyczących produktu i technologii; rozwijasz produkt, który jest aktywnie wykorzystywany i stale rozwijany; masz przestrzeń do proponowania własnych rozwiązań, usprawnień i inicjatyw technicznych; stawiamy na pragmatyczne, proste i skuteczne rozwiązania zamiast niepotrzebnej złożoności; pracujesz w zespole opartym na bezpośredniej komunikacji i szybkim podejmowaniu decyzji; masz wpływ zarówno na implementację, jak i na procesy techniczne oraz organizację pracy zespołu; cenimy odpowiedzialność, partnerstwo i proaktywną postawę; działamy bez rozbudowanych struktur korporacyjnych - decyzje podejmujemy szybko i blisko zespołu. Co oferujemy: pracę wśród życzliwych i wspierających osób – stawiamy na relacje i dobrą atmosferę, mówimy sobie po imieniu. wpływ i nieskrępowany rozwój – Twoje pomysły i rozwiązania traktujemy na serio, pracę z biura (Warszawa-Żoliborz) dofinansowanie do karty MultiSport i opieki medycznej – lubimy sport, dbamy o zdrowie. 🔎 Proces rekrutacji: 1. Przegląd zgłoszeń 2. 10-minutowy video screening z wybranymi kandydatami 3. 40-minutowy test kompetencji logicznych 4. Zadanie rekrutacyjne i rozmowa z zespołem

🏢 Summary: Backend Tech Lead role focused on leading and implementing a strategic rewrite of a core financial platform module into a modern, scalable architecture. The position combines hands-on Java/Spring Boot development with architectural decision-making, API design, and integration across multiple enterprise banking systems. It involves designing high-performance backend services handling large transactional and reporting datasets. 🗂️ Requirements: 7+ years backend or fullstack development experience, Strong Java expertise, Strong Spring Boot expertise, Experience designing REST APIs, Experience as Tech Lead or technical owner, Experience designing scalable and distributed systems, Strong relational database design skills (PostgreSQL), Experience with Elasticsearch or similar search technology, Experience integrating external systems via REST or GraphQL, Experience with Docker and Kubernetes, Experience with CI/CD pipelines, Knowledge of OAuth2 and OIDC, Working knowledge of React, Working knowledge of TypeScript, Experience handling large datasets with complex queries, Ability to lead architecture and mentor developers 📃 Skills: Java, Spring, SpringBoot, REST, GraphQL, PostgreSQL, Elasticsearch, Docker, Kubernetes, CI/CD, OAuth2, OIDC, React, TypeScript, SQL, Microservices, DistributedSystems 🏢 Description: Our client is an international financial technology company building solutions that support transaction communication, balances visibility, reporting, and integrations across multiple banking systems . We are looking for a Backend Tech Lead to join a strategic rewrite of a core platform module. The role combines technical leadership with hands-on backend development , helping redesign a legacy component into a modern, scalable architecture. You will work closely with product stakeholders, platform engineers, and frontend teams to design and implement reliable, high-performance backend services that integrate multiple enterprise systems. IN SHORT: 🌍 Remote work or on-site (Wrocław, Bielsko-Biała) – your choice! 💰 170 - 190 PLN/h + VAT ☑️ B2B contract Your Daily Missions Lead the design and development of backend services for a core platform rewrite. Design scalable services responsible for transactions, balances, statements, and reporting data . Define API contracts and integration patterns between backend services, frontend applications, and external enterprise systems. Make key decisions around data modeling, search/indexing strategies, and performance optimization for million-row datasets with complex filtering, sorting, and pagination . Support frontend teams by ensuring API-first design and smooth integration with React applications . Ensure engineering quality through code reviews, architecture discussions, and mentoring other developers . Collaborate closely with product, frontend, and platform teams to deliver robust, production-ready systems . The Essentials We're Seeking 7+ years of experience in backend or fullstack software development. Strong expertise in Java and Spring Boot , including designing modular backend services and REST APIs. Experience acting as a Tech Lead or technical owner responsible for architectural decisions. Solid experience designing scalable APIs and distributed systems . Strong understanding of data modeling in relational databases (e.g., PostgreSQL) and designing efficient query patterns. Practical experience with Elasticsearch (or similar search/indexing technologies) for filtering, search, and aggregation over large datasets. Experience designing hybrid data architectures combining multiple data sources . Experience working with external system integrations , including REST or GraphQL APIs. Familiarity with containerized environments (Docker, Kubernetes) and modern CI/CD pipelines. Understanding of security patterns in enterprise systems (OAuth2, OIDC, authentication and authorization flows). Working knowledge of React and TypeScript , enabling effective collaboration with frontend teams. Proven ability to break down complex architectural changes into manageable development phases . Experience using AI-assisted development tools (e.g., Cursor, Claude Code, or similar agentic coding tools) and openness to experimenting with AI-driven approaches to improve development efficiency and engineering workflows . Ability to combine hands-on engineering with technical leadership and mentoring . Nice-to-Haves Experience in FinTech, banking, or enterprise integration platforms . Experience with large-scale transactional or reporting systems . Experience with GraphQL integrations . Experience with data migration or legacy system modernization . Experience designing API-first platforms . Familiarity with observability practices (logging, metrics, tracing). Understanding of database partitioning and query optimization patterns . Reasons Why You Would Enjoy Working With Us We work in the latest technologies and with international clients, and our projects are polished from < to /> - learn about some of the projects we have completed. We organize TechTalks, meet-ups and create guilds where we exchange knowledge - you can learn a lot from your teammates. We have a close-knit team and we make sure to have regular integrations - we often go out to celebrate together. You can work remotely or choose to work from our offices in Wroclaw or Bielsko-Biala. However, we count on your openness to occasionally visit the office for team meetings or client visits, or possible occasional trips to the client's headquarters. You can adjust your working hours to suit your needs, starting your day between 7:00 and 10:00 am. You can work with great specialists in their fields who also have a sense of humor and other after-hours hobbies. It is the people who create the unique atmosphere and relaxed atmosphere at CSHARK. We have a flat structure - we are not a corporation and don't want to be one 🙃. We offer bonuses for employee referrals (from 3000 PLN to 7000 PLN). We organize remote English classes and provide access to the company library. You can also become an author/author of articles published on our technical blog - https://cshark.com/blog/ .

🏢 Summary: Remote Team Lead Software Development role focused on leading a cross-functional engineering team while staying hands-on with backend and web service architecture and implementation in a .NET environment. The position combines technical leadership, product collaboration, and ownership of architectural decisions in an agile setup. You will drive engineering quality, technical standards, and team growth while contributing directly to code and system design. 🗂️ Requirements: Several years of experience in software development with .NET / C#, Minimum 3 years of experience leading development teams, Strong knowledge of software design patterns, Strong understanding of system architecture, Experience with modern engineering practices, Hands-on experience with backend and web services development, Experience using AI in software development process, Fluent English 📃 Skills: .NET, C#, AI, Elasticsearch, RabbitMQ, Redis, Azure, CI/CD, Umbraco, Containers, Backend, WebServices, Architecture, Agile 🏢 Description: Does building awesome, innovative products that add up to something meaningful sound like a dream come true? Come join us and make that vision a reality! About We are looking for an experienced Team Lead Software Development who combines strong technical expertise with leadership skills and a product-oriented mindset. In this role, you will take ownership of development teams, supporting both its technical direction and people development. You will lead a cross-functional engineering team of around 7–9 people , including Frontend, Backend, and QA specialists. The team works in an agile setup and collaborates closely with a Product Owner, UX Design, DevOps, and ITOps. Responsibilities Lead, coach, and support the development of your engineering team Help your team grow into a high-performing, self-organized unit Act as a sparring partner for the Product Owner and actively contribute to roadmap planning and prioritization Stay hands-on with the design, architecture, and implementation of backend and web services Make and own technical decisions, while communicating them clearly to stakeholders Improve agile processes within the team and continuously optimize the way of working Contribute to solution and domain design Strengthen engineering quality, good practices, and technical standards Take part in recruitment interviews and support the further development of the team Our offer Competitive salary on B2B contract Fully remote position Real impact and independence at work Individual career path Work-life balance A non-corporate atmosphere where innovation, personal growth, and teamwork thrive 100+ smart, curious & ambitious engineers What you bring Several years of experience in software development with .NET / C# At least 3 years of experience leading development teams, both technically and people-wise Experience using AI in the software development process Strong understanding of software design patterns, system architecture, and modern engineering practices A hands-on approach and the ability to stay close to the code when needed Strong communication skills and the ability to explain technical topics clearly to both technical and non-technical stakeholders A pragmatic mindset — you care about quality, but you also understand business priorities Fluent English, German is a plus Nice to have Experience with Elasticsearch, RabbitMQ, Redis, containers, Azure Cloud, CI/CD, Umbraco Experience working in a scale-up environment Knowledge of the financial market or financial products Benefits International Projects Small Teams Flat Structure Friendly Atmosphere Flexible Hours Individual Career Path We want your TALENT! Don’t hesitate and APPLY! We are happy to tell you more details about this position in a phone call. Our recruitment process is very fast and straightforward to ensure a great experience from the first interview to joining your dream team!

🏢 Summary: Senior Front-End Tech / Team Lead role focused on building scalable, enterprise-grade applications using React and TypeScript while leading a development team. Combines hands-on frontend engineering with architectural decision-making, code quality ownership, and technical mentorship. Involves working within Agile processes to deliver high-quality, secure, and maintainable solutions. 🗂️ Requirements: Senior or Lead-level frontend development experience, Proven experience leading technical teams, Strong expertise in React and TypeScript, Experience with Redux and RTK Query, Experience with relational and NoSQL databases, Experience with containerization and orchestration tools, Experience with CI/CD and Git-based workflows, Knowledge of unit and integration testing frameworks, Experience working in Agile environments, Ability to translate business requirements into technical solutions 📃 Skills: React, TypeScript, Redux, RTKQuery, HTML5, CSS3, Tailwind, PostgreSQL, MongoDB, SQLServer, RabbitMQ, Redis, Auth0, Kubernetes, Docker, Git, GitLab, Azure, Jest, Mocha, JUnit, NUnit, SCORM, xAPI, LTI, MSGraphAPI, ZoomSDK, WCAG 🏢 Description: Key Role Objectives The Front-End Tech / Team Lead role combines deep technical expertise with leadership responsibilities, ensuring high quality code delivery while mentoring and guiding the development team, help make architectural decisions, and build scalable and enterprise solutions. Key Details Location: [Krakow – preferred] Employment Type: [B2B] Experience Level: [ Senior / Lead] Key Requirements   |   Technical Frontend: React 18 with Typescript, Redux, RTK Query, HTML5, CSS3, Tailwind Databases: PostgreSQL, MongoDB, SQL Server Other Third Party: RabbitMQ, Redis, Auth0 DevOps: K8s, Docker, Git (GitLab), Azure Testing: Unit and integration testing frameworks (e.g., Jest, Mocha, Junit, NUnit) Bonus: LTI standards, SCORM/xAPI, or real-time systems (e.g., live quizzes, video classrooms) Key Requirements | Leadership Proven experience in a lead or senior role guiding technical teams Team communication skills and experience working in Agile environments Strong stakeholder management skills and ability to interpret and evaluate business goals Ability to translate business goals into technical execution plans Key Responsibilities | Technical Develop, test and maintain robust and stable services and applications using your language of expertise Follow the mandatory standards and conventions, including technical and behavioural, defined for the project Read and follow the architectural product documentation in decision-making process and implementation Ensure high quality and correctness of the changes produced by your teammates through meticulous code reviews Cover your produced code with effective unit tests and ensure sufficient level of coverage Follow the product non-functional requirements, including performance, security, maintainability, and scalability Participate in architectural decisions; contribute to technical strategy and documentation Keep abreast and informed about the latest technological improvements, be curious and proactive to apply the best technologies and practices to the project being developed Key Responsibilities | Leadership Lead a l team of developers through agile sprints and project lifecycles Mentor junior and mid-level engineers, foster a culture of collaboration and innovation and promote best practices Communicate and ensure processes, standards and conventions established for the project Collaborate with Product Managers, UX/UI Designers and QA teams, to align tech solutions with business goals Translate product requirements into technical deliverables that meet business requirements and deadlines Drive continuous improvement in processes, architecture, and team culture Own and manage technical debt, refactoring, and system improvements Nice to Haves Prior experience in the EdTech domain (e-learning platforms, digital classrooms, LMS) Knowledge of learning science, instructional design, or accessibility standards (e.g., WCAG) Familiarity with MS Graph API, Auth0 API, Zoom SDK, LTI, Clever

🏢 Summary: Backend Team Lead role focused on hands-on development and leading a small team while building a cloud-native application protection platform (CNAPP) based on microservices architecture. The position involves designing and implementing scalable backend systems integrated with AWS, GCP, and Azure, and optimizing high-throughput, real-time data processing solutions. It combines technical leadership with active contribution to code in a cybersecurity-focused project. 🗂️ Requirements: Minimum 8 years of backend development experience, Minimum 3 years of team leadership experience, Proficiency in at least one high-level language: Java, C#, Python or Go, Experience with AWS, GCP or Azure, Experience with high-throughput data processing systems, Experience with message queue technologies, Experience with microservices architecture 📃 Skills: Java, C#, Python, Go, AWS, GCP, Azure, Microservices, Kafka, RabbitMQ, Cloud, CNAPP 🏢 Description: Dla naszego klienta z branży cyberbezpieczeństwa / IT poszukujemy kandydata na stanowisko Backend Team Lead! ZADANIA Aktywne, codzienne programowanie i wkład w rozwój kodu źródłowego. Współtworzenie i rozwój zaawansowanej platformy ochrony aplikacji natywnych dla chmury (CNAPP) w oparciu o architekturę mikrousług. Projektowanie i wdrażanie skalowalnych rozwiązań backendowych zintegrowanych z głównymi środowiskami chmurowymi: AWS, GCP oraz Azure. Rozwój i optymalizacja systemów przetwarzających ogromne ilości danych w czasie rzeczywistym z wykorzystaniem technologii kolejek komunikatów. Kierowanie małym, dynamicznym zespołem inżynierów backendu liczącym około 3–6 osób w roli "hands-on" Team Leada. WYMAGANIA Co najmniej 8 lat doświadczenia w inżynierii backendowej z wykorzystaniem języków programowania wysokiego poziomu (np. Java, C#, Python, Go) Co najmniej 3 lata doświadczenia na stanowisku kierownika zespołu Doświadczenie w pracy z platformami i produktami chmurowymi (np. AWS, GCP i Azure) Doświadczenie we wdrażaniu systemów intensywnie przetwarzających dane (technologie kolejek komunikatów) Doświadczenie w architekturze opartej na mikrousługach MILE WIDZIANE Doświadczenie w branży cyberbezpieczeństwa CO OFERUJEMY NA TYM PROJEKCIE? Współpracę w oparciu o umowę B2B. Pracę hybrydową z Krakowa (2/3 razy w tygodniu w biura) Wsparcie dedykowanego opiekuna. Po dołączeniu do speedapp, otrzymasz kontakt do dedykowanego opiekuna, który zadba, aby współpraca z nami oraz z klientem sprawiała Ci satysfakcję. Wydarzenia oraz spotkania integracyjne, a także udział w różnych inicjatywach np. sportowych. Dostęp do oferty benefitów (opieka medyczna, ubezpieczenie na życie, karta Multisport). JAK WYGLĄDA REKRUTACJA? Zgłoszenie: Zaaplikuj i prześlij swoje CV. Po weryfikacji aplikacji rekruter skontaktuje się telefonicznie z wybranymi kandydatami. Screening: Porozmawiaj z rekruterem speedapp o Twoim doświadczeniu. Kolejne etapy: Rekruter speedapp przedstawi Ci jak wygląda proces rekrutacji na dane stanowisko. Rekruter speedapp pozostanie z Tobą w kontakcie podczas całego procesu. O SPEEDAPP W speedapp wierzymy, że organizacja jest tak dobra jak tworzący ją ludzie. Jesteśmy zespołem ekspertów IT i innych specjalistów pracujących dla naszych klientów na całym świecie (m.in Izrael, Austria, USA). Wykraczamy daleko poza kategorię HR. Budujemy zespoły IT, a także pomagamy w ich zarządzaniu. 👉 10 lat doświadczenia 👉 +100 klientów na całym świecie +300 zatrudnień rocznie 💎 Jesteśmy laureatem prestiżowej nagrody Diamenty Forbes cztery lata z rzędu (2022, 2023, 2024, 2025), członkiem sieci Fast Growth Icons oraz FinTech Poland.

🏢 Summary: Backend Engineer role focused on designing and scaling real-time, cloud-based systems and APIs for an AI-powered consumer product. The position involves building reliable backend services, data pipelines, and infrastructure on AWS within a high-performing engineering team. You will collaborate with mobile and AI teams to deliver low-latency, scalable, and secure user experiences. 🗂️ Requirements: 2+ years backend development experience with Node.js and TypeScript, Strong knowledge of PostgreSQL including schema design and query optimization, Experience with Redis for caching and queue management, Hands-on experience with AWS services (EC2, RDS, Lambda, ECS, S3), Strong REST API design skills and real-time communication patterns, Understanding of scalability, concurrency, and distributed systems, Experience with Docker, Git workflows, and CI/CD automation, Knowledge of backend security and performance best practices 📃 Skills: Node.js, TypeScript, PostgreSQL, Redis, AWS, EC2, RDS, Lambda, ECS, S3, REST, WebSockets, SSE, Docker, Git, CICD 🏢 Description: Backend Engineer – Node.js, TypeScript, AWS For our client, a fast-growing team building a next-generation AI-powered consumer product, we are looking for an experienced Backend Engineer to help scale the systems powering real-time experiences, cloud synchronization, and intelligent APIs. This is not a founding role, but it is a highly impactful engineering position within a small, high-performing team focused on building world-class consumer technology products. About the role You will be responsible for designing, building, and scaling backend systems that support core product functionality — from real-time data pipelines to reliable cloud infrastructure and low-latency APIs. You’ll work closely with mobile and AI teams to deliver fast, scalable, and highly reliable user experiences. Responsibilities Backend Development Design and build RESTful APIs using Node.js and TypeScript (Express.js or Nest.js) Architect and maintain PostgreSQL databases, including schema design and query optimization Implement background jobs and queue systems using Redis for ingestion, summarization, and notifications Build and maintain caching layers (Redis, CDN, HTTP cache) to ensure low-latency performance Implement authentication, authorization, and data privacy best practices Add real-time capabilities using WebSockets and Server-Sent Events Build observability into services through logging, metrics, and tracing Deploy and manage backend services on AWS (EC2, ECS, RDS, S3, Lambda) Systems & Architecture Design clean, scalable, and maintainable service architectures Plan and execute safe database migrations and schema evolution strategies Ensure consistency and reliability across distributed systems Optimize system performance across I/O, CPU, and memory bottlenecks Build and maintain CI/CD pipelines and release automation workflows Contribute to infrastructure reliability, scalability, monitoring, and cost optimization Quality & Security Write unit, integration, and contract tests with clear quality standards Enforce linting, type safety, and static analysis within CI pipelines Conduct security reviews and dependency audits while following least-privilege principles Clearly document services, APIs, and important architectural trade-offs Requirements Must-have 2+ years of backend development experience with Node.js and TypeScript Strong understanding of PostgreSQL, including schema design, indexing, and query optimization Experience working with Redis for caching and queue management Hands-on experience with AWS services such as EC2, RDS, Lambda, ECS, and S3 Strong API design skills, including REST and real-time communication patterns Solid understanding of scalability, concurrency, and distributed systems Experience with Docker, Git workflows, and CI/CD automation Familiarity with security and backend performance best practices Nice to have Experience with GraphQL or gRPC Exposure to event-driven architectures or microservices Familiarity with observability tools such as OpenTelemetry, CloudWatch, or Sentry Experience building high-traffic consumer applications Example stack Backend: Node.js, TypeScript (Express.js / Nest.js), PostgreSQL, Redis Cloud: AWS (EC2, RDS, Lambda, ECS, S3, CloudWatch) Infrastructure: Docker, GitHub Actions, CI/CD

🏢 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: Tech Leader role in an international transformation program focused on modernizing core enterprise platforms across multiple countries. The position combines hands-on Java development with technical leadership, driving architecture decisions and ensuring high-quality delivery in an agile environment. You will design and evolve complex core systems while collaborating with cross-functional stakeholders. 🗂️ Requirements: 6+ years enterprise software development experience, Experience with complex core systems (configuration, integrations, business logic), Strong knowledge of Java and JVM ecosystem, Experience designing and implementing REST APIs, Strong SQL knowledge, Experience in Agile/Scrum environments, Ability to lead technical delivery and mentor developers, Understanding of clean code principles and design patterns, Fluent English 📃 Skills: Java, JVM, REST, SQL, Agile, Scrum 🏢 Description: About the role You will join an international technology team working on a large-scale transformation program focused on modernizing core business platforms across multiple countries. The team operates in an agile setup and is responsible for building and evolving critical systems that support key business processes. We are looking for a Tech Leader who combines strong hands-on engineering skills with the ability to drive technical decisions and ensure high-quality delivery. You will work closely with both business and technology stakeholders in a collaborative, cross-functional environment. Key responsibilities Lead technical delivery within the development team (hands-on + mentoring) Design and implement new features within a core enterprise platform Translate business requirements into scalable technical solutions Ensure high code quality, performance, and adherence to engineering best practices Collaborate with business analysts, testers, and stakeholders Maintain and enhance existing solutions Identify and reduce technical debt Actively participate in Scrum ceremonies and contribute to continuous improvement Create and maintain technical documentation Requirements 6+ years of experience in enterprise software development Experience working with complex core systems (configuration, integrations, business logic) Strong knowledge of: Java / JVM ecosystem REST APIs SQL Experience working in Agile/Scrum environments Proven ability to guide and mentor developers Solid understanding of clean code principles and design patterns Fluent English Nice to have Experience with large-scale, distributed systems Background in transformation or platform modernization projects Experience working in international environments What’s in it for you Participation in a large, international transformation program Work in a mature agile environment Real impact on architecture and platform evolution Collaboration with experienced teams across multiple locations Flexible form of cooperation: employment contract (UoP) or B2B

🏢 Summary: Tech Lead role focused on designing and delivering backend-centric, cloud-based solutions for a custom industrial application covering end-to-end logistics, production, and shipment processes. The position combines strong .NET backend expertise with Angular fullstack work, emphasizing Domain Driven Design, Clean Architecture, and microservices. The role requires technical ownership, architectural decision-making, and pragmatic delivery within a European team. 🗂️ Requirements: Minimum 7 years of commercial experience in .NET development, Experience in senior or Tech Lead role, Strong backend expertise, Hands-on Fullstack experience with Angular, Experience with cloud-native architectures, Knowledge of Domain Driven Design, Knowledge of Clean Architecture, Experience with microservices, Experience with API design, Practical use of AI tools in development, Fluent English, Residence in Poland 📃 Skills: .NET, Angular, C#, Cloud, Microservices, APIs, DDD, Architecture, AI, Git 🏢 Description: We are looking for an experienced Tech Lead to join a European team working on a custom-built solution for the industrial/manufacturing sector. The application supports an end-to-end process—from logistics, through production, to final shipment—ensuring full traceability and process control. This role is strongly backend- and cloud-focused and requires a pragmatic, delivery-oriented mindset. Your tasks Design, develop, and maintain backend-centric fullstack solutions using .NET and Angular Take ownership of technical decisions with a strong focus on backend architecture and cloud-based solutions Build and evolve systems based on Domain Driven Design and Clean Architecture Design, develop, and maintain microservices, APIs, and integration layers Ensure code quality through unit tests and architectural consistency Plan and realistically deliver roadmap items, focusing on feasibility, prioritization, and execution Requirements Minimum 7 years of commercial experience in .NET development, including senior or tech lead responsibilities Strong backend expertise combined with hands-on experience as a Fullstack Developer (Angular) Solid understanding of cloud-native architectures and modern backend systems Solid understanding of Domain Driven Design, Clean Architecture, microservices, and API design Practical experience using AI tools in daily development work (e.g., AI copilots, AI-assisted coding, AI-driven workflows) Pragmatic, realistic engineering mindset focused on delivery, planning, and rational decision-making Ability to take ownership of complex topics and drive them to completion Fluency in English Residing in Poland required