June 8, 2026

Lead Systems Engineer/ Exchange Architect

Senior • Remote

40 - 49 USD

Krakow, Poland

About the client:

Our customer is the European online car market with over 30 million monthly users, with a market presence in 18 countries. As a Laed System Engineer/ Exchange Architect, you will play a pivotal role in shaping the future of online car markets and enhancing the user experience for millions of car buyers and sellers.

Project Overview

We require an experienced Microsoft Exchange consultant to lead and manage a production migration to:

  • Microsoft Exchange Server Subscription Edition (Exchange SE)

  • Windows Server 2022

  • 2-node DAG deployment

  • AWS-hosted infrastructure

  • Edge Transport decommission

  • Backup implementation (Veeam)

  • Third-party integration validation

This is a business-critical migration affecting approximately 200 users.

Requirements

  • EDT Timezone work hours 

  • Minimum 5+ years of hands-on Microsoft Exchange experience

  • Proven experience with Exchange 2019 / Exchange SEExperience deploying Exchange in AWS (EC2, EBS, networking)

  • Strong experience with Database Availability Group (DAG) design and configuration

  • Experience migrating production Exchange environments

  • Windows Server 2022 experience

  • Active Directory schema preparation and health validation

  • Experience implementing Exchange-aware backup solutions (Veeam preferred)

  • Log truncation configuration and validation

  • Recovery Database (RDB) restore procedures

  • Backup retention design and restore testing

  • Edge Transport decommission experience

  • IronPort or similar secure mail gateway integration

  • SSL certificate configuration (SAN / Autodiscover)

  • Experience validating Exchange transport agents

  • Handling third-party application compatibility during upgrades

  • At least upper-intermediate English level

 Responsibilities

  • Review and validate the architecture design

  • Prepare a detailed migration runbook

  • Define rollback plan

  • Implement Exchange SE deployment

  • Configure DAG

  • Oversee backup configuration

  • Validate the restore procedure

  • Lead production cutover

  • Provide post-migration stabilization support

  • Migration plan document

  • Backup & restore validation documentation

  • Rollback procedure

  • Post-migration health report

  • Knowledge transfer session

  • On-call support during cutover window

Nice-to-Have Certifications

  • Microsoft Certified: Messaging Administrator

  • Microsoft Certified: Windows Server Hybrid Administrator

  • Veeam Certified Engineer (VMCE)

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Krakow, Poland

8,000 - 9,000 USD

🏢 Summary: Lead FullStack Engineer role focused on building and scaling high-traffic, public-facing web platforms for a large online marketplace. The position involves leveraging AI tools within the SDLC, owning end-to-end development processes, and delivering performant, production-ready solutions across frontend and backend systems. 🗂️ Requirements: 5+ years of experience building reliable, scalable, highly available systems, Strong knowledge of software architecture and design patterns, Experience applying clean code principles and coding standards, Proficiency with AI development tools and integrating them into SDLC, Experience with AI frameworks, Strong backend development experience with C# or Node.js, Strong proficiency in TypeScript, Strong experience with SQL and NoSQL databases, Strong frontend development skills (HTML, CSS, JavaScript), Experience with component-based frameworks and SSR, Experience with cloud infrastructure and containerization tools, Experience building and consuming APIs in service-based architectures, Experience with CI/CD pipelines, Experience with logging and monitoring tools, Experience with unit testing (backend and frontend), Upper-intermediate English, Availability to work in required time zones 📃 Skills: C#, Node.js, TypeScript, SQL, NoSQL, GraphQL, Redis, HTML, CSS, JavaScript, React, Next.js, Vue.js, Angular, AWS, Terraform, Docker, Git, CI/CD, Datadog, NewRelic, LangChain, Vercel, ChatGPT, Codex 🏢 Description: About the client: Our customer is the European online car market, with over 30 million monthly users and a presence in 18 countries. As a Lead FullStack Engineer, you will play a pivotal role in shaping the future of online car markets and enhancing the user experience for millions of car buyers and sellers. Responsibilities: Developing fast, high-traffic public-facing websites Explore new technologies and help the team to use them Work using AI tools and apply them to the SDLC Following software development best practices while delivering the work Following testing principles while testing your own code to ensure production readiness Follow the philosophy of: you-build-it-you-run-it (be responsible for the SDLC processes) Requirements: 5+ years developing reliable, highly available, and scalable software systems Strong understanding of software architecture and design patterns Firm grasp of clean code principles and coding standards Strong proficiency using AI tooling , such as ChatGPT/Codex, for rapid development Experience integrating AI tooling into your development environment for streamlined usage Experience with AI Frameworks like Vercel AI SDK, LangChain, etc. Strong proficiency with backend development with C# or Node.js Strong proficiency with TypeScript Strong proficiency with SQL& NoSQL datastores (GraphQL, Redis) Strong proficiency with frontend development (HTML, CSS, JavaScript) Strong proficiency with component-based frameworks and SSR (Next.js/React or Vue.js) or Angular with the desire to learn React/ Vue.js. Hands-on experience developing and maintaining 3rd party content management systems Knowledge of modern cloud infrastructures and tools, such as AWS, Terraform, and Docker Experience with APIs and developing in a service-based application environment Experience building optimized UIs for performance Proficiency with version control systems such as Git Experience working within a formal CI/CD pipeline Experience with logging, monitoring, and alerting services like Datadog, Newrelic Solid approach to testing and ensuring quality of code, Unit testing, backend, and frontend At least Upper-intermediate English level This role requires mandatory timezone coverage: work must align with the Toronto (ET) timezone for LATAM hours and 13:00–21:00 EET for EU hours approximately. We offer*: Flexible working format - remote, office-based or flexible A competitive salary and good compensation package Personalized career growth Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more) Active tech communities with regular knowledge sharing Education reimbursement Memorable anniversary presents Corporate events and team buildings Other location-specific benefits *not applicable for freelancers