Backend Engineer
Integration Engineer - Machine Learning - OneRail’s Technology Hub - Poland
Krakow
Apply on the employer's siteRole description
Thanks for visiting our Career Page. Please review our open positions and apply to the positions that match your qualifications.
Integration Engineer - Machine Learning - OneRail’s Technology Hub - Poland
Krakow, Poland
Full Time
OneRail Technology Hub - Poland
Experienced
Share
Integration Engineer - Machine Learning
OneRail is a technology company innovating solutions for multi-modal delivery. We have built and continue to develop a delivery orchestration platform that connects shippers to an extensive courier ecosystem to automate, optimize, and control the entire delivery supply chain, from the demand signal to the proof of delivery.
Our OmniPoint SaaS platform uses proprietary algorithms and artificial intelligence to power efficient same-day delivery programs for major companies like Lowe’s, Pepsi, American Tire Distributors, and Advance Auto Parts.
We’re seeking a dedicated Integration Engineer whose primary focus will be integrating machine learning models into our flagship product. You’ll bridge the gap between data science and production software—implementing, deploying, and maintaining ML-powered features while contributing to back-end services and React-based front-end components. Your work will enable seamless, scalable AI capabilities for end users.
Key Responsibilities
- Work with ML pipeline engineers to deploy and maintain ML models (e.g., PyTorch, scikit-learn) as robust service endpoints.
- Collaborate with data scientists and product to productionize prototypes, and extend the product to enable ML and AI features.
- Define and evolve RESTful APIs with OpenAPI/Swagger—ensuring they support low-latency, high-throughput ML inference.
- Version, document, and maintain API contracts for internal and external consumers.
- Build microservices (Python—FastAPI/Flask—or Node.js) that encapsulate ML logic, data pre/post-processing, and business rules.
- Optimize service performance, scalability, and reliability (caching, async processing, batching).
- Implement and modify React components and pages to expose ML-driven functionality
- Ensure seamless data flow from back end to front end, handling streaming or polling as needed.
- Containerize ML services (Docker) and orchestrate deployments
- Work closely with cross-functional teams (data science, product, QA) to translate ML requirements into production features.
- Champion code quality, API versioning strategies, and thorough documentation.
Requirements:
- 3+ years of professional full-stack development, with a clear track record of integrating ML into production systems.
- Hands-on experience serving models in production (model serialization, serving frameworks, inference optimizations).
- Strong TypeScript and Python proficiency
- Experience with microservices architecture, message brokers (Kafka wtc), and async frameworks
- Solid React knowledge (hooks, context, state management);
- Deep understanding of REST principles, OpenAPI/Swagger, and API versioning/Backward-compatibility.
- Docker and orchestration experience.
- CI/CD pipelines (GitHub Actions, Jenkins, GitLab CI) and automated testing (unit, integration, e2e).
- Strong communicator, able to translate technical concepts for non-technical stakeholders.
- Excellent problem solver with an eye for scalable system design.
- Advanced proficiency in English, both written and spoken (B2+).
Not sure if you have enough experience to meet the challenge, but still willing to learn and join our team? Send us your application and we will be happy to talk about the possibilities. Think big!
Why Join OneRail Poland?
- Innovation at its Core: Work on industry-leading technology that is shaping the future of logistics.
- Career Growth: Opportunities for professional development and career advancement.
- Collaborative Culture: Join a team of talented engineers and industry experts.
- Exciting Challenges: Solve complex problems and contribute to impactful projects.
- Flexibility: We offer a flexible hybrid work style and flexible employment types to suit your needs, ensuring a work-life balance that works for you.
- Competitive Compensation: Attractive salary and benefits package.
Office location:
Kraków, Poland
Work Style:
hybrid (2-3 days from the office / week preferred), We are open to a more flexible arrangement for candidates located outside the Krakow area.
Salary level:
20 000 – 27 000 PLN/ month
Take the next step in your career and become a part of OneRail’s exciting journey!
About OneRail
OneRail is a leading omnichannel fulfillment solution pairing best-in-class software with logistics as a service to provide dependability and speed to help businesses meet their delivery promise. With a real-time connected network of 12 million drivers, OneRail matches the right vehicle for the right delivery so brands lower expenses and increase capacity to rapidly scale their businesses. This people-plus-platform approach features a 24/7 USA-based exceptions team who maintain a 98% on-time delivery rate. By optimizing fulfillment processes, reducing costs and improving order accuracy with store-shelf-to-doorstep visibility, OneRail is committed to empowering clients and improving the customer experience.
OneRail was named to the Deloitte Technology Fast 500™ two years in a row, was ranked 19th in the 2025 FreightTech 25, named for the fifth year in a row to the FreightTech 100, was honored as one of Inc. magazine’s Best Workplaces 2023, was listed on Forbes’ lists of America’s Best Startup Employers for the last three years, was named to the Inc. 5000 two years in a row and was selected as the Last Mile Company of the Year for the 2024 SupplyTech Breakthrough Awards. To learn more about OneRail, visit OneRail.com.
Share
Apply for this position
Required
*
First Name
*
Last Name
*
Email Address
*
Phone
*
Address
*
Resume
*
We've received your resume. Click here to update it.
Attach resume or Paste resume
Attach resume as .pdf, .doc, .docx, .odt, .txt, or .rtf (limit 5MB) or Paste resume
Paste your resume here or Attach resume file
Cover Letter
Who referred you to this position? Enter their first and last name here.
LinkedIn Profile URL
Website, blog or portfolio:
What languages do you speak fluently?
*
Earliest start date?
*
To help us assess your alignment with the role’s location requirements (e.g., hybrid/in-office expectations), please indicate where you currently reside (city and country).
*
Requirements
To help us better understand your preferences and ensure alignment with the role’s requirements, please use the space below to answer the following:
- Are there any work arrangements you are unable or unwilling to accommodate? (*required* — Please do not include medical or other sensitive personal information in your response)
- What is your preferred work arrangement (e.g., hybrid, remote, in-office)? (*optional* — Please do not include medical or other sensitive personal information in your response)
- Are there any special accommodations you wish to request? (*optional* — Please do not include medical or other sensitive personal information in your response)
Please note: Your responses will only be used to assess alignment with the specific role and its location requirements. Providing a preferred work arrangement or requesting an accommodation is entirely optional and will not negatively impact your application. All requests will be considered on a case-by-case basis.
*
Because this Poland-based role involves collaboration with English-speaking teams in the U.S., it may require regular, proficient communication in English. As such, please indicate your spoken and written languages and your level of both spoken and written proficiency for each language indicated.”
*
Please specify your expected monthly salary and your preferred form of cooperation (e.g., gross for an employment contract or net for a B2B arrangement).
*
What is the length of the notice period necessary for you to provide to your current organization if you are offered employment with OneRail Poland Sp. z o.o.?
*
-- No answer --I am available to start employment with immediatelyI need to provide a one week notice to my current organizationI need to provide a two week notice to my current organizationI need to provide a three week notice to my current organizationI need to provide a one month notice to my current organizationI need to provide a two month notice to my current organizationI need to provide more than a three or more month notice to my current organization
Optional: Please use the space below should you wish to provide any additional position/job/industry-related experience or qualifications you’d like us to consider as part of your application. If you consent below, we may also consider this information in connection with future opportunities.
I understand that by submitting this application, I consent to the processing of my personal data by OneRail Poland Sp. z o.o. for the purpose of evaluating my qualifications for the position for which I am applying. If I choose not to provide this consent, my application will not be considered, and any data I have submitted will be deleted in accordance with data protection regulations.
*
-- No answer --I Agree/ConsentI Do Not Agree/Consent
I consent to OneRail Poland Sp. z o.o. retaining my personal data for future recruitment processes beyond the role for which I am currently applying, for a period of 12 months.
*
-- No answer --I Agree/ConsentI Do NOT Agree/Consent
Human Check
*
I consent to receive SMS/text messages regarding my job application with OneRail. These messages may include updates on my application status, interview invitations, reminders, and other information directly related to this job application. Message frequency will vary. Message and data rates may apply. Reply HELP for help or STOP to cancel.
Submit Application
This is a saved copy of a posting published elsewhere. Postings get taken down without notice — check the employer's site before applying. mentors.coach is not the hiring party.