Senior Backend Engineer

We are looking for a highly experienced, strictly hands-on
Senior Full Stack Engineer (Python)
to join a senior engineering team. You will drive the delivery and modernization of a complex B2B SaaS platform used by global enterprise clients. In this role, you will build new product modules end-to-end, from technical specification through to production deployment, while modernizing a mature codebase.

Responsibilities

• Build new platform modules end-to-end: translate business requirements into technical specs (use cases, data models, API designs) through to production deployment
• Execute modernization of the Python/Flask codebase - clean layered architecture, reduced technical debt, improved testability
• Act as quality gate for all AI-generated code - catching logic errors, security issues, and architectural violations
• Partner with the Intelligence Systems Engineer on features touching the AI/agent layer
• Collaborate with the Angular Architect on API contracts and frontend integration
• Write operational documentation: changelogs for QA, operations guides for DevOps, architecture docs for developers
• Proactively identify and address security concerns during development

Requirements

• Proven commercial experience as a Senior Backend or Full Stack Engineer, actively engaged in hands-on coding (no pure advisory roles).
• Strong proficiency in modern Python, with a focus on writing clean, type-safe, and well-documented code.
• Solid experience with Python web frameworks (e.g., Flask, FastAPI, Django) and a good understanding of web application architecture.
• Expertise in relational databases (preferably PostgreSQL), SQL, and schema design.
• Strong security mindset with a proven ability to identify, understand, and mitigate real-world web vulnerabilities.
• Hands-on experience using AI coding tools (Copilot, Cursor, Claude) as part of your daily workflow, paired with a critical eye for reviewing AI-generated code.
• Experience working with containerization (Docker, Kubernetes) and background processing systems (e.g., Redis, Celery).
• Excellent independent problem-solving skills and the ability to navigate complex codebases.

Nice to have

• Proven experience decomposing monolithic/legacy codebases into a clean, layered architecture.
• Hands-on modernization experience within mature, production-grade SaaS products.
• Familiarity with Python ORMs (e.g., SQLObject, SQLAlchemy).

We offer

• Opportunity to work on bleeding-edge projects
• Work with a highly motivated and dedicated team
• Competitive salary
• Flexible schedule
• Benefits package - medical insurance, sports
• Corporate social events
• Professional development opportunities
• Well-equipped office

About Us
Grid Dynamics (NASDAQ: GDYN) is a leading provider of technology consulting, platform and product engineering, AI, and advanced analytics services. Fusing technical vision with business acumen, we solve the most pressing technical challenges and enable positive business outcomes for enterprise companies undergoing business transformation. A key differentiator for Grid Dynamics is our 8 years of experience and leadership in enterprise AI, supported by profound expertise and ongoing investment in data, analytics, cloud & DevOps, application modernization and customer experience. Founded in 2006, Grid Dynamics is headquartered in Silicon Valley with offices across the Americas, Europe, and India.

We’ve signed up to an ambitious journey. Join us!
As Arrive, we guide customers and communities towards brighter futures and more livable cities, it isn’t a challenge just anyone could take on. Luckily, we have something to help us make it happen. Our people and our values. We Arrive Curious, Focused and Together. Just as our entire brand is inspired by the North Star, the shining light leading travelers to their destinations since time began, our values guide us. They help us be at our best. For our customers. For the cities and communities we serve. For ourselves. As a global team, we are transforming urban mobility. Let’s grow better, together.

Role Overview
As a Senior Software Engineer on our Pulse Core team, you will be a high-impact individual contributor helping accelerate the velocity of all City’s Experience product teams. You will work alongside a Tech Lead and Engineering Manager in a team that builds and maintains a robust, self-service developer platform and shared core services — and that embraces AI-assisted development as part of its daily workflow.

This is an execution-focused role — you will design, build, test, and own features end-to-end. You will contribute to architectural discussions and influence technical decisions, but the overall technical vision is owned by the Tech Lead. Your focus is on delivering high-quality, well-tested code at pace, and on growing your own skills in a team that is defining the future of how we build software.

What makes this a Senior Engineer role (not a Tech Lead role)

• You contribute to the technical vision and architecture — you don’t own it.
• You execute on the roadmap with a high degree of autonomy, but you are not jointly accountable for the team’s overall technical direction.
• You pair with and learn from the Tech Lead, and you mentor mid-level engineers — but uplifting the entire team’s practices is not your primary responsibility.
• You are expected to be self-directed — you can take a loosely defined problem, break it down, and deliver a well-tested solution with minimal guidance.

Key Responsibilities

• Design and Build Features End-to-End: Take ownership of features from requirements through design, implementation, testing, deployment, and production monitoring. You own what you build.
• Write High-Quality, Well-Tested Code: Primary development is centered on Node.js leveraging your deep backend engineering background from languages like Java, Kotlin, Go to build resilient architectures.
• Embrace AI-Assisted Development: Use generative AI tools (Claude, Cursor, Copilot) as part of your daily development workflow. You don't need to be a power-user from day one, but you should be enthusiastic about learning and growing your AI-assisted coding skills.
• Own Your Services in Production (DevOps/SRE): Embrace “You Build It, You Run It.” Fully own production deployment, incident resolution, monitoring, and alerting. Actively participate in on-call rotations and build with observability and resilience in mind from the start.
• Contribute to System Design & Infrastructure: Participate actively in design discussions and infrastructure planning. Help bridge the gap between our code and infrastructure across both cloud and on-premise solutions.
• Collaborate, Communicate & Mentor: Work closely with Product, Design, and your engineering peers. Support the growth of mid-level team members through pairing, code reviews, and knowledge-sharing.

Required Skills

• Strong Engineering Experience: 5–8 years of professional software engineering experience, with a track record of delivering complex features in production systems.
• Strong Backend Background: Deep experience in traditional backend languages like Java, Kotlin, or Go. You understand concurrency, distributed systems, API design, and performance tuning, and can effortlessly apply these principles to Node.js development.
• Full Stack Breadth with Node.js Target: Hands-on experience with Node.js and modern TypeScript/JavaScript across the full stack is a plus, but senior backend engineers eager to apply their Java/Kotlin/Go expertise to Node.js are strongly encouraged to apply.
• DevOps & SRE Expertise: Proven experience managing production deployments, configuring proactive monitoring and alerting systems, and resolving critical live incidents. Must be comfortable participating in on-call rotations.
• Infrastructure & Kubernetes: Solid understanding of both AWS cloud infrastructure and on-premise Kubernetes environment setups. Experience with IaC tools (like Terraform) and CI/CD pipelines (like GitHub Actions) is highly valued.
• System Design Competence: You can design and reason about scalable, distributed systems. You understand trade-offs and can articulate your design decisions clearly.
• Testing and Quality Mindset: You write unit, integration, and contract tests as a matter of course. Experience with quality tooling and robust CI/CD principles is expected.
• AI-Assisted Development Awareness: Familiarity with AI coding tools. A genuine enthusiasm to learn and adopt AI-first workflows is essential.

We are open to candidates based anywhere in Poland who are available to travel to the office in Łódź as needed to meet business requirements.
Arrive, including brands like EasyPark, Flowbird, RingGo, ParkMobile and Parkopedia, is a leading global mobility platform. Present in over 90 countries and 20,000 cities, the company helps people and decision-makers make smarter decisions about urban mobility and ease the experience of travel worldwide. Arrive delivers a unique combination of the core ingredients to make cities more livable: from smart payments and optimized car parks to data-driven traffic reduction and support for reinvestment in public transport and green space. It’s about more than function, it’s about saving time and simplifying the experience of travel for everyone. Travel is more than a journey, it’s how you Arrive.

Description & Requirements
Who we are looking for

• 10+ years of professional experience in software development.
• Strong expertise in C# and .NET technologies, particularly ASP.NET Core.
• Experience with Entity Framework and relational databases.
• Solid knowledge of APIs, integration patterns, and SQL.
• Hands-on experience with Angular and TypeScript and/or Java Spring Boot.
• Experience with Microsoft SQL Server, Azure Database, and Microsoft IIS.
• Familiarity with Azure services such as Azure Functions, Service Bus, API Management, Logic Apps, Azure Data Factory, and Container Apps is an advantage.
• Strong analytical, problem-solving, and communication skills.
• Experience working in Agile development environments.

Your future role
As a Senior Application Developer, you will play a key role in designing, developing, and integrating modern enterprise applications that support the digitalization of business processes across the organization.

Your Responsibilities:

• Design, develop, and maintain modern, scalable applications and services.
• Collaborate in agile software development and integration projects.
• Drive the onboarding of new applications into the enterprise application landscape.
• Develop and implement integration solutions using Microsoft Azure Integration Services.
• Enable seamless integration across business-critical systems and platforms.
• Analyze, document, and optimize integration processes, interfaces, and technical solutions.
• Work closely with cross-functional teams to deliver end-to-end digital solutions and drive innovation.

What we offer

• Stable job in multinational company based on employment contract;
• Working in flexible hybrid model - partially from home and the office;
• Great opportunity for professional development (individual training plan, soft skills and technical trainings, access to modern training platforms e.g. Udemy for Business, LinkedIn Learning);
• Structured onboarding process and Buddy program for new joiners;
• Open and friendly organizational culture based on the pillars of well-being and diversity & inclusion

About Deloitte
Deloitte is a variety of people, experience, industries and services we deliver in 150 countries of the world. It is an intellectual challenge, a good starting point for your career, and an excellent opportunity for continuous development and gaining valuable life experiences. What you only must do is to take the first step – press the apply button and send us your CV, go through all the stages of the recruitment process and sign a contract with us. Deloitte is simply your best choice.

The Impact You'll Make
Danfoss Group IT is seeking an
experienced developer
to forefront our integration initiatives and drive the continued improvement of our application portfolio in
Azure cloud.
In this pivotal role, you will be responsible for designing, developing, and deploying robust and scalable enterprise-level integrations.

You will be part of the Digital Customer Experience (DCE) team, with more than 125 international colleagues, where we develop, support, and lead the digital customer experience in Danfoss. We connect business needs and IT into digital solutions.

If you are passionate about building innovative solutions on Azure and have a proven track record of delivering high-quality results, we encourage you to apply with your cv in the English language.
The position is open in our locations in Slovenia, Croatia, Poland and Romania.
The job shall be hybrid.
What You’ll Be Doing

• Design and implement event-driven integrations (Azure Event Grid and Azure Service Bus) and serverless functions following MACH principles.
• Utilizing Azure CDN to serve assets and ensure the best possible user experience.
• Develop and maintain Infrastructure as Code (IaC) solutions using Bicep.
• Ensure adherence to Microsoft Azure security best practices and industry standards including access controls, data encryption, and vulnerability management.
• Establish and maintain a robust CI/CD pipeline using Azure DevOps to automate the build, test, and deployment processes.

What We're Looking For

• Proven professional experience in Azure integration technologies, including Azure Functions, Azure Event Grid, Azure Service Bus, and Azure API Management.
• Strong proficiency in .NET development and C#.
• Solid understanding of serverless architectures and cloud-native principles.
• Expertise in Infrastructure as Code (IaC) using Bicep or Terraform.
• Experience with CI/CD pipelines and tools like Azure DevOps.
• Deep knowledge of security best practices and compliance standards.
• Strong communication and collaboration abilities.
• Proficiency in spoken and written English.

What You'll Get From Us

• We promote from within and support your learning with mentoring, training, and access to global opportunities.
• You’ll have flexibility, autonomy, and support to do your best work while maintaining a healthy work-life balance. Your well-being matters to us.
• We strive to create an inclusive work environment where people of all backgrounds are respected, and valued for who they are.
• Together with your employment we provide non salary benefits that we share with your during the recruitment process.

Ready to Make a Difference?
If this role excites you, we’d love to hear from you! Apply now to start the conversation and learn more about where your career can go with us.

All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, veteran status, or other protected category