Backend Engineer

• With the support of your team’s tech lead and manager, you will break down larger projects into individual tasks, deliver them in multiple phases, and collaborate with others to ensure timely delivery of your work.
• You will support your peers and stakeholders in the product development lifecycle by collaborating with product management, design & analytics by participating in ideation, articulating technical constraints, and partnering on decisions that properly consider risks and trade-offs.
• You will support the operations and availability of your team’s artifacts by creating and monitoring metrics, escalating when needed, and supporting “keep the lights on” & on-call efforts.
• You will contribute to a sense of community on your team by engaging in growth and development activities such as participation in the interview process.

Software Engineer II, Backend – Collections

• Maintain core system components and drive optimization tasks focused on performance and speed
• Work closely with logging, monitoring, and telemetry features, improving error handling and system visibility
• Develop software mainly using Golang and C, while maintaining and gradually replacing legacy Bash scripts
• Create automated tests using Python to cover regressions and bridge coverage gaps
• Investigate complex bugs, track system calls, and analyze multithreaded dependencies in a codebase
• Take part in technical discussions with the team to define how to best implement requirements

Golang Software Engineer, Python/C

C Software Engineer, Python

• Design, develop and maintain complex, business-critical application and system components, Kotlin
• Take end-to-end ownership of solutions, from requirements analysis to implementation and production support
• Investigate and resolve incidents and problems, including root-cause analysis
• Support technical design decisions with focus on scalability, performance, security and maintainability
• Review code and architecture to ensure quality, consistency and best practice standards
• Identify technical debt, risks and improvement opportunities, and actively drive continuous improvement
• Collaborate with product owners, business analysts, QA, operations and other IT teams
• Mentor and support junior developers through coaching, code reviews and knowledge sharing
• Contribute to technical documentation, knowledge bases and operational runbooks

Senior IT Developer, Kotlin

• Develop and maintain scalable backend services using Python and Django
• Build and extend content management capabilities with Wagtail CMS
• Design and implement GraphQL APIs to power modern frontend applications
• Develop responsive, performant frontend components using React and Next.js
• Collaborate with product, design, and engineering teams to translate business requirements into technical solutions
• Ensure high code quality through code reviews, testing, and adherence to best practices
• Contribute to the product roadmap by providing technical insights and delivery estimates
• Support continuous improvement of development workflows and DevOps practices

Full-stack Developer, Python, Django

• Dołączenie do zespołu pracującego nad Aras Innovator jako .NET Full-Stack Developer
• Tworzenie aplikacji dla złożonych potrzeb przedsiębiorstw na platformie niskokodowej
• Współpraca z innymi członkami zespołu nad dostosowywaniem produktu do potrzeb klientów

Net Full-Stack Developer

• Work on tasks that contribute to the team's projects and goals
• Collaborate with your team and stakeholders to create visibility and dialog regarding work risks and trade-offs
• Ensure speed and quality in your work to hit business goals while protecting from downtime
• Engage in growth and development activities to build a sense of community

Software Engineer I, Backend – Collections

• Join Platform Security Solutions organisation at Technology Platform Engineering & Operations division
• Bolster Self-Service, Scanning and Platform Integrations function
• Maintain and expand existing, as well as develop new products from scratch and operationalize them at enterprise scale
• Work with multiple internally developed distributed systems, portals and data warehouses
• Shape the future of cybersecurity and IT solutions

Senior Security Software Engineer – .NET, Assistant Vice President

• Take a spec and drive it to production: clarify ambiguities with the spec author instead of guessing, decompose work into small verifiable increments, execute via AI agents
• Design verification before generation: acceptance criteria, tests, invariants and API contracts that make agent output checkable
• Review and accept agent-generated code: catch silent scope creep, tests fitted to bugs, hallucinated APIs, code that passes but does the wrong thing
• Step in and code by hand when an agent hits a dead end (mostly Go)
• Build and tune the agent toolchain: skills, prompts, guardrails, workflows — and measure what matters: first-pass acceptance rate, rework volume, spec-to-production cycle time

AI-Native Fullstack Engineer, Go, React

• Build that runtime protection layer end-to-end.
• Define the product — what we intercept, what we don't, what the customer-visible surface looks like.
• Determine the technical approach — instrumentation strategy, deployment shape, programming language — all open.
• Implement the product, end to end, using the full tooling stack provided.
• Establish your methodology for building conviction in your detection logic.
• Utilize cross-layer signal from existing stack to help with threat intelligence and detection.

Security Engineer – Node.js, Proactive Defense

• Design and develop high-performance applications using Java.
• Work with GraphDB and Scala-based components to manage complex data relationships and processing.
• Support big data systems operating at scale with continuous, real-time data processing.
• Build and optimize systems for transaction monitoring, sanctions screening, and fraud detection.
• Ensure platform reliability, scalability, and performance for business-critical workloads.

Senior Java Engineer

• Dołączysz do zespołu, który buduje nową platformę do planowania i uruchamiania kampanii reklamowych w wielu kanałach jednocześnie, używaną przez największe marki na rynku.
• Po stronie backendu w Javie będziesz rozwijać mikroserwisy odpowiedzialne za zarządzanie kampaniami, budżetami, rozliczeniami oraz integracje z zewnętrznymi systemami reklamowymi poprzez rozbudowane API.
• System musi działać przy bardzo dużej skali ruchu, z naciskiem na wydajność, stabilność i przetwarzanie danych w czasie zbliżonym do rzeczywistego.
• Pracujemy w środowisku z wysokimi wymaganiami bezpieczeństwa i standardami wdrożeń, co wymusza dobre praktyki inżynierskie i automatyzację.

Senior Java Developer

• Review business requirements and validate technical solutions.
• Contribute to implementation planning.
• Develop integration services with external providers and public systems.
• Implement fiscalization and electronic invoicing functionality.
• Deliver production-ready solutions.
• Maintain service stability through monitoring, logging, and incident response.
• Collaborate on regulatory services.
• Independently deliver integration tasks after onboarding.

Senior GO Developer – Short-term Project

• Help build and evolve core systems behind Fliff’s sports data platform
• Work close to the domain: sports events, leagues, teams, players, markets, odds, etc.
• Ensure correct, timely, observable, and resilient data when external feeds behave unpredictably
• Support real-time experiences across Fliff and help teams move faster with confidence

Senior Python Engineer, DataFeed Team

• Tworzenie produktów z obszaru FinTech, HealthTech i AI
• Praca w modelach Team Augmentation, Full Outsourcing oraz end-to-end dla klientów spoza Polski
• Budowanie działających produktów, które przechodzą audyty, skalują się i realnie zdobywają rynek
• Odpowiedzialność, techniczne myślenie i sensowna współpraca

• Own and deliver quarterly goals for your team, leading engineers through ambiguity.
• Design and implement real-time fraud decisioning services and APIs in Python or Kotlin.
• Build and evolve the platform to launch fraud decisioning in a new country quickly.
• Integrate region-specific fraud and risk vendors and operationalize machine learning and AI signals.
• Support peers and stakeholders across the product development lifecycle.
• Monitor metrics and contribute to keep-the-lights-on and on-call efforts.
• Foster a culture of quality and ownership within the team.

Senior Software Engineer, Back-end – Fraud

• **The role you’ll play:**As a **Mid Software Engineer** reporting to the **Engineering Manager** in our **Product Development** team, your purpose will be to design, build, and maintain scalable, high-quality systems that empower beauty professionals worldwide. You’ll work on new features, optimise system performance, and shape the architecture to support our growing platform.**
• You’ll collaborate with product managers, designers, and engineers to craft solutions that solve real-world problems for millions of users while driving innovation and continuous improvement in our codebase.

Mid Software Engineer, Python

• Design, build, and maintain production-grade applications using TypeScript across the stack
• Develop intuitive, performant user interfaces using React and modern front-end tooling
• Build and maintain backend services, APIs, and integrations (Node.js / TypeScript)
• Collaborate with product managers and designers to translate requirements into technical solutions
• Write clean, testable, maintainable code with strong attention to performance and reliability
• Participate in code reviews, architecture discussions, and continuous improvement initiatives
• Troubleshoot issues across the stack and contribute to a culture of engineering excellence

Full Stack Engineer – TypeScript, React, Node.js

• Working with a Scrum team of Engineers on a greenfield project
• Developing software applications and solutions based on documented business and system requirements
• Understanding how applications operate, they are structured, and how customers use them
• Taking ownership of the delivery schedule and quality of work
• Providing input and estimates about the effort required to build desired functionality
• Designing applications for stability, scalability, and performance

Senior Full-stack Software Engineer – Nest.js, Node.js, React

• Designing and developing backend services using Java 17+ and Spring Boot.
• Building and maintaining scalable, distributed systems based on Apache Kafka.
• Integrating applications with PostgreSQL databases.
• Ensuring cloud-readiness and deploying services in AWS.
• Troubleshooting and debugging issues in distributed environments.
• Writing clean, testable code using TDD principles.
• Collaborating with cross-functional teams to define, design, and deliver new features.

Backend Engineer jobs in Poland

See all jobs on JobTailor

Software Engineer II, Backend – Collections

Golang Software Engineer, Python/C

C Software Engineer, Python

Senior IT Developer, Kotlin

Full-stack Developer, Python, Django

Net Full-Stack Developer

Software Engineer I, Backend – Collections

Senior Security Software Engineer – .NET, Assistant Vice President

AI-Native Fullstack Engineer, Go, React

Security Engineer – Node.js, Proactive Defense

Senior Java Engineer

Senior Java Developer

Senior GO Developer – Short-term Project

Senior Python Engineer, DataFeed Team

Senior Java Developer

Senior Software Engineer, Back-end – Fraud

Mid Software Engineer, Python

Full Stack Engineer – TypeScript, React, Node.js

Senior Full-stack Software Engineer – Nest.js, Node.js, React

Senior Java Developer