API Integrations Engineer II — Build Reliable Connections

System One; Seaford (DE); On-site; USD 85,000 - 110,000; Full time

Benefits offered by this job

Health and welfare benefits

401(k) plan

Job summary

System One is seeking an Integrations Engineer II (API) to design, implement, and support API‑based integrations with customers and vendors across logistics ecosystems. You will gather requirements, build authentication and data mapping logic, and monitor data flow to resolve issues.

The role collaborates with TMS/WMS/ERP teams, documents APIs, and drives onboarding with clients and suppliers toward go‑live, while ensuring security and data standards.

Qualifications

• Bachelor's degree in Information Technology, Computer Science, Supply Chain, or a related field; or equivalent work experience.
• 2–4+ years of experience building or supporting API integrations, preferably in a logistics, supply chain, or transportation environment.
• Experience working with REST and/or SOAP APIs, including authentication methods such as OAuth 2.0 and API key management.
• Experience integrating with or supporting TMS, WMS, or ERP platforms is a plus.
• Familiarity with EDI concepts and X12 transaction sets is a plus, but not required.
• Knowledge of NetSuite and/or MercuryGate is a plus, but not required.
• Strong analytical and problem‑solving skills.
• Effective written and verbal communication skills.
• Ability to manage multiple priorities in a fast‑paced environment.
• Proficiency in Microsoft Office (Excel, Word, Outlook).
• Experience with Jira for ticket tracking and project management is a plus.
• Experience with Freshservice for IT service management is a plus.

Responsibilities

• Design, develop, test, and support API-based integrations with customers and vendors, including REST and SOAP web services.
• Gather and translate business and technical requirements from customers, vendors, and internal teams into working integration solutions.
• Build and maintain authentication, authorization, and data mapping logic for inbound and outbound API connections (e.g., OAuth, API keys, tokens).
• Monitor integration performance and data flow, proactively identifying and resolving errors, failures, or data discrepancies.
• Collaborate with TMS, WMS, ERP, and EDI teams to ensure integrations align with broader system architecture and data standards.
• Develop and maintain clear technical documentation, including API specifications, data mapping guides, and integration runbooks.
• Partner with customers and vendors during onboarding to scope, test, and validate new integrations through go-live.
• Troubleshoot integration issues across the full stack — from API payloads and authentication to downstream system processing.
• Support security and compliance requirements related to API access, data handling, and third‑party connections.
• Participate in code reviews, testing, and continuous improvement of integration tools, patterns, and processes.
• Track and manage integration work through Jira and support requests through Freshservice.

Skills

REST API

SOAP API

OAuth 2.0

API keys management

Analytical thinking

Communication skills

Multitasking

Education

Bachelor's degree in IT / CS / Supply Chain or related field

Tools

Jira

Freshservice

NetSuite

MercuryGate

Job description

System One is seeking an Integrations Engineer II (API) to design, implement, and support API‑based integrations with customers and vendors across logistics ecosystems. You will gather requirements, build authentication and data mapping logic, and monitor data flow to resolve issues.

The role collaborates with TMS/WMS/ERP teams, documents APIs, and drives onboarding with clients and suppliers toward go‑live, while ensuring security and data standards.