Fullstack Developer, HR systems integration

Harvey Nash Poland; Warszawa; Hybrid; PLN 180,000 - 240,000; Full time

Job summary

Harvey Nash Poland is seeking a Full Stack Developer for an international financial company in Warsaw, requiring 3 days in the office weekly. You will build and own integrations between enterprise systems and HR SaaS platforms, lead end-to-end delivery, and design robust RESTful APIs for modern and legacy interfaces.

The role demands 5+ years in software engineering, SaaS HR integration experience, AWS cloud work, Terraform IaC, and collaboration with HR and Finance on requirements.

Qualifications

• 5+ years of software engineering experience.
• Hands-on SaaS HR software integration experience.
• Experience designing RESTful APIs and integrating third‑party services.
• Experience with OAuth2/OIDC/SAML/SSO authentication.
• Experience deploying services on AWS and using IaC (Terraform).
• Some frontend development experience and stakeholder liaison experience.

Responsibilities

• Build and own integrations between enterprise systems and third-party HR SaaS platforms (70% backend, 30% frontend).
• Lead end-to-end technical delivery of integration projects.
• Design and implement robust RESTful APIs and web service adapters for REST and SOAP.
• Partner with HR, Talent Acquisition, Finance and other teams to gather requirements.
• Act as cloud-native integration owner with security/compliance teams.
• Implement and maintain CI/CD pipelines, automated tests and monitoring.

Skills

Software engineering

HR SaaS integrations

RESTful APIs

OAuth2/OIDC/SAML/SSO

AWS cloud

Git and CI/CD

Terraform IaC

Frontend development

Requirements gathering

Tools

Terraform

Job description

For our client, an international financial company, we are looking for:

Full Stack Developer, HR Enterprise Systems

Location: Warsaw, Poland (3 days in office per week)

Tasks:

• Build and own integrations between enterprise systems and third-party HR SaaS platforms (70% backend, 30% frontend)
• Lead end-to-end technical delivery of integration projects
• Design and implement robust RESTful APIs and web service adapters that handle both modern REST and legacy SOAP interfaces
• Partner with HR, Talent Acquisition, Finance and other corporate teams to gather and manager requirements
• Act as the cloud-native integration owner with security and compliance teams
• Implement and maintain CI/CD pipelines, automated tests and monitoring

Requirements:

• 5+ years of experience in software engineering (development & design)
• Hands‑on experience in SaaS HR software integration (preferably in‑house)
• Proven experience designing and implementing RESTful APIs and integrating third‑party web services
• Experience with authentication and authorization standards (OAuth2, OIDC, SAML and SSO)
• Experience building and operating services on a major cloud platform (AWS preferred)
• Experience with Git, CI/CD and IaC (Terraform)
• Some experience with frontend development
• Some experience in gathering and managing requirements (liaising with stakeholders)