ASSYSTEM

Senior Software Engineer

ASSYSTEM
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5 months ago
Bristol, United KingdomSenior

Responsibilities

  • Work with senior stakeholders to understand requirements and contribute from discovery through production support.
  • Design, build, test, deploy, and support software applications, services, and reusable components.
  • Create pragmatic technical designs balancing quality, security, maintainability, and long-term supportability.
  • Develop across backend services, integrations, and user-facing applications.
  • Design secure APIs and integrations across digital products, enterprise systems, and data services.
  • Collaborate with data engineers on APIs, events, and data contracts.
  • Contribute to code reviews, engineering standards, testing, CI/CD, and documentation.
  • Mentor and support colleagues through pairing, review, and day-to-day collaboration.
  • Make appropriate technology choices across a mixed technology estate.

Requirements

  • At least 8 years of experience delivering production software end to end while working closely with stakeholders.
  • Frontend and backend development experience.
  • Experience designing APIs and integrating with enterprise systems and data services.
  • Strong understanding of software design principles and modern engineering practices.
  • Experience with automated testing and CI/CD.
  • Experience working with relational databases and familiarity with database and caching technologies.
  • Understanding of secure coding, modern authentication, and authorization.
  • Experience delivering software in cloud-hosted environments such as Azure.
  • Ability to work effectively across a mixed technology estate.
  • Strong communication and collaboration skills.
  • Experience mentoring others through review, pairing, and practical support.
  • Practical use of, or strong interest in, AI-assisted development tools in a responsible delivery environment.
  • Desired experience with container tooling, Microsoft Power Platform, and Office document automation for Excel, Word, and PDF generation.
  • Depending on project requirements, ability to meet UK residency criteria and obtain UK security clearance such as BPSS and potentially SC.

Benefits

  • Hybrid working opportunity.
  • Flexible working hours.
  • Pension scheme with an 8% company contribution and 4% personal contribution.
  • 25 days of paid annual leave plus bank holidays, with an option to buy or sell days.
  • Professional fees reimbursed.
  • Employee referral scheme.
  • Competitive sick pay.
  • Income protection and 3x salary death-in-service cover.
  • Free digital gym access.
  • 24/7 employee support line for mental health, financial, and legal help.

Tech Stack

AngularApache KafkaAzureC#DjangoDockerFastAPIKubernetesMongoDB.NETPostgreSQLPythonRabbitMQRedisTalendTypeScriptVue.js
ASSYSTEM

About ASSYSTEM

5,001-10,000 employees

Assystem is a public engineering and consulting group headquartered in Courbevoie, France, that designs, supervises, and digitizes complex infrastructure projects for nuclear and low‑carbon energy, grids, hydrogen, and transport clients. It sells engineering, project management, and digital services to utilities, developers, and industrial operators. Founded in 1966 and listed on Euronext Paris, the company operates across Europe, Asia, Africa, and the Middle East.

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