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ASSYSTEM

Engineering services for design, construction, commissioning

Expert / Lead Developer SAP Integration Suite

Contract
No salary listed
Mid
Courbevoie, France
Hybrid
IT OperationsEnterprise Applications

About the job

Requirements
  • Expertise in SAP Integration Suite, Cloud Integration and iFlows, and API Management and API Lifecycle.
  • Mastery of integrations with SAP S/4HANA Cloud, including APIs, OData, events, and standard SAP mechanisms.
  • Experience integrating SaaS platforms, ideally Workday, in hybrid and international information-system environments.
  • Mastery of synchronous, asynchronous, event-driven, and batch integration patterns.
  • Skills in data mapping and transformation, exception handling, retry and replay, idempotence, and reconciliation.
  • Mastery of monitoring, logging, alerting, and observability.
  • Knowledge of interface security, including OAuth2, certificates, mutual TLS, and secret management.
  • Experience with CI/CD, transports, and environment management in SAP Integration Suite.
  • Familiarity with Clean Core principles and designing integrations that limit coupling with SAP S/4HANA.
  • Ability to support developers, challenge designs, and promote knowledge sharing.
  • Comfort with code reviews and pair-programming sessions, with attention to maintainability and production operability.
Responsibilities
  • Act as the SAP Integration Suite technical reference for the team and directly participate in building the first integration flows.
  • Support developers in building their skills in SAP Integration Suite.
  • Design and develop, with the team, the first integration flows between SAP S/4HANA Cloud, Workday, and enterprise applications.
  • Define and communicate design and development best practices.
  • Establish reusable integration patterns to prevent proliferation of bespoke development.
  • Help the team select suitable patterns for requirements, including APIs, event-driven, asynchronous, batch, and file-based approaches.
  • Conduct architecture and code reviews and help developers resolve complex issues.
  • Define standards for error handling, retry and replay, idempotence, traceability, and reconciliation.
  • Establish practices for effective production operations, including logs, monitoring, alerting, flow correlation, incident diagnosis, and observability.
  • Contribute to industrializing development and deployment through versioning, CI/CD, environment management, and component promotion.
  • Define interface security rules for authentication, certificates, secrets, OAuth2, access management, and encryption.
  • Contribute to documentation of architectures, interfaces, standards, and operating procedures.
  • Help the team progressively build an integration framework and catalog of patterns.
  • Transfer knowledge in a structured way so the team can operate autonomously at the end of the assignment.
Desired Qualifications
  • Knowledge of SAP BTP and Event Mesh.

About the company

Assystem provides engineering services for complex projects, covering design, construction, supervision, commissioning, and operation, with a strong focus on the nuclear and energy sectors. Its approach combines multidisciplinary engineering teams and project-management capabilities to move projects from initial concept through to operation. The company differentiates itself through a long track record, strategic acquisitions (including Alphatem in 1995 and Mactech Energy Group in 2025) and an early public offering in 2013, which have expanded its capabilities and market reach in the energy and nuclear fields. Its goal is to be a leading, reliable partner for clients by delivering end-to-end engineering services and helping them meet safety, performance, and regulatory requirements across the project lifecycle.

Company Size

5,001-10,000

Company Stage

IPO

Headquarters

Paris, France

Founded

1966

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Simplify's Take

What believers are saying

  • H1 2026 revenue grew 2.5% organically; nuclear grew 8.0%.
  • France delivered 4.2% organic growth on new-builds, fuel cycle, and digitalisation.
  • UK momentum accelerated after April 2026 SMR, CPS2, and MoD framework wins.

What critics are saying

  • Nuclear concentration leaves Assystem exposed if French EPR2 schedules slip beyond 2027.
  • H1 2026 international revenue fell from currency hits and project endings in India.
  • Rolls-Royce SMR still needs FID, regulatory clearance, and site decisions before revenue scales.

What makes ASSYSTEM unique

  • Assystem derived 81% of H1 2026 revenue from nuclear engineering.
  • April 2026 UK wins placed Assystem on CPS2 and MoD delivery frameworks.
  • January 2025 Mactech Energy Group deepened Assystem's UK nuclear construction capabilities.

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Benefits

  • Health Insurance
  • Dental Insurance
  • Vision Insurance
  • Unlimited Paid Time Off
  • Flexible Work Hours
  • Remote Work Options
  • Paid Vacation
  • Paid Holidays
  • Hybrid Work Options
  • 401(k) Retirement Plan
  • Wellness Program
  • Mental Health Support

Company News

Yahoo Finance
Jul 23rd, 2026
Assystem's H1 revenue rises 2.5% organically to $371.2M on nuclear growth

Assystem reported consolidated revenue of €328.5 million for the first half of 2026, representing organic growth of 2.5% despite a 1.9% negative currency effect. The French engineering group's nuclear activities drove performance with 8.0% organic growth, accounting for 81% of total revenue. Revenue in France rose 4.2% organically to €201.1 million, led by strong momentum in nuclear new-builds and fuel cycle activities. International operations generated €127.4 million, remaining stable organically despite currency headwinds from the pound sterling, Indian rupee, and Saudi riyal. The UK showed robust growth in civil nuclear engineering and defence. However, business volumes declined in the Middle East, Central Asia region and India due to project endings and slower contract phasing. Assystem confirmed its full-year 2026 targets.

Yahoo Finance
Apr 23rd, 2026
Assystem posts $187.4M Q1 revenue with 2.2% organic growth driven by nuclear sector

Assystem, an international engineering group, reported first-quarter 2026 consolidated revenue of €165.8 million, representing 2.2% organic growth driven by strong nuclear sector performance of 8.0%. Nuclear activities accounted for 81% of total revenue, up from 76% in the prior year. French operations grew 4.4% to €102.6 million, driven by momentum in fuel cycle activities, new-builds and digitalisation. International revenue declined 7.1% to €63.2 million, primarily due to a 6.0% negative currency effect from the pound sterling, Indian rupee and Saudi riyal. The UK showed robust growth in civil nuclear engineering and defence. Assystem secured key positions on government frameworks and its client Rolls-Royce SMR signed a contract with Great British Energy for three small modular reactors.

Bdaily
Jan 30th, 2025
Assystem expands UK footprint with takeover

A global nuclear engineering firm has strengthened its UK presence with the acquisition of a specialist construction company. Paris-headquartered Assystem has… | North East | Construction | Engineering | International | Energy | Mergers & Acquisitions | Commercial Partnerships | Manufacturing & Construction |

Assystem
Jan 17th, 2024
Assystem acquires KEOPS Automation, engineering specialist in automated systems and data enhancement

Assystem, an international engineering, digital services and project management company, has acquired 100% of the shares of KEOPS Automation, a French company specializing in the integration of industrial operating platforms and the enhancement of their data (industrial OT and IT, automated systems, supervision systems, BI applied to manufacturing).

Global Construction Review
Jan 5th, 2024
France’s Assystem acquires India’s L&T Infrastructure Engineering - Global Construction Review

France-headquartered engineer and project manager Assystem has acquired India’s L&T Infrastructure Engineering, a subsidiary of the Larsen & Toubro group.