276 to 300 of 1,343 ECMAScript Jobs in London

maintainable, and well-tested code Required Experience 2–5 years of professional software engineering experience, ideally working on backend systems, APIs, or AI-related products Proficiency in Python and JavaScript/TypeScript (Node.js) Strong understanding of backend architectures, REST/GraphQL APIs, and data modelling Experience with containerisation (Docker) and cloud platforms ( GCP , AWS , or similar) Familiarity with LLM or More ❯

maintainable, and well-tested code Required Experience 2–5 years of professional software engineering experience, ideally working on backend systems, APIs, or AI-related products Proficiency in Python and JavaScript/TypeScript (Node.js) Strong understanding of backend architectures, REST/GraphQL APIs, and data modelling Experience with containerisation (Docker) and cloud platforms ( GCP , AWS , or similar) Familiarity with LLM or More ❯

scalable, and cost-conscious architectures in coordination with solutions architects. Demonstrated leadership in mentoring or upskilling other engineers. Advanced scripting and development experience (e.g., Python, Bash, Java, Golang, or JavaScript). Proficiency with infrastructure-as-code tools such as Terraform, Ansible, or Pulumi. Hands-on experience with UNIX/Linux systems and modern DevOps toolchains. Working knowledge of GitOps (e.g. More ❯

scalable, and cost-conscious architectures in coordination with solutions architects. Demonstrated leadership in mentoring or upskilling other engineers. Advanced scripting and development experience (e.g., Python, Bash, Java, Golang, or JavaScript). Proficiency with infrastructure-as-code tools such as Terraform, Ansible, or Pulumi. Hands-on experience with UNIX/Linux systems and modern DevOps toolchains. Working knowledge of GitOps (e.g. More ❯

scalable, and cost-conscious architectures in coordination with solutions architects. Demonstrated leadership in mentoring or upskilling other engineers. Advanced scripting and development experience (e.g., Python, Bash, Java, Golang, or JavaScript). Proficiency with infrastructure-as-code tools such as Terraform, Ansible, or Pulumi. Hands-on experience with UNIX/Linux systems and modern DevOps toolchains. Working knowledge of GitOps (e.g. More ❯

scalable, and cost-conscious architectures in coordination with solutions architects. Demonstrated leadership in mentoring or upskilling other engineers. Advanced scripting and development experience (e.g., Python, Bash, Java, Golang, or JavaScript). Proficiency with infrastructure-as-code tools such as Terraform, Ansible, or Pulumi. Hands-on experience with UNIX/Linux systems and modern DevOps toolchains. Working knowledge of GitOps (e.g. More ❯

FlaUI, or Katalon . Proficiency in performance testing tools like JMeter, Gatling, K6, Neoload, or Webload . Strong coding skills in at least one language such as Java, TypeScript JavaScript, Python, C#, , Scala, or PHP. Experience designing and building automation frameworks . Familiarity with Agile development environments (SCRUM, Kanban, TDD, BDD). Implementing pipelines using common tooling such as Jenkins More ❯

architectures, from fully open source/bespoke environments through to fully proprietary, Enterprise and COTS-based. Strong scripting/programming skills - SQL essential, others such as Python, Java/JavaScript, C# very welcome. API & Web Services - REST/RESTFul, SOAP, XML, JSON Cloud Platform proficiency - Knowing how to deploy, manage, and integrate services across cloud platforms is vital in either More ❯

Strong problem-solving and communication skills, with the ability to work effectively in collaborative teams. Exposure to agile delivery methods. Experience with other development languages or frameworks such as JavaScript, Java, Python, or .NET – or a strong willingness to learn and adapt to new technologies as required. Qualifications & Certifications Salesforce Platform Developer I – Required Salesforce Platform Developer II – Desirable Other More ❯

Strong problem-solving and communication skills, with the ability to work effectively in collaborative teams. Exposure to agile delivery methods. Experience with other development languages or frameworks such as JavaScript, Java, Python, or .NET or a strong willingness to learn and adapt to new technologies as required. Qualifications & Certifications Salesforce Platform Developer I Required Salesforce Platform Developer II Desirable Other More ❯

with us means having direct involvement in delivering our technical road map and will be working directly on several key product enhancements. You’ll work with Python/Django, Javascript and AWS. Our platform is also increasingly AI-powered, so familiarity with implementing AI solutions (RAG etc) is an advantage. You’ll be working on a project where everything is More ❯

with us means having direct involvement in delivering our technical road map and will be working directly on several key product enhancements. You’ll work with Python/Django, Javascript and AWS. Our platform is also increasingly AI-powered, so familiarity with implementing AI solutions (RAG etc) is an advantage. You’ll be working on a project where everything is More ❯

with us means having direct involvement in delivering our technical road map and will be working directly on several key product enhancements. You’ll work with Python/Django, Javascript and AWS. Our platform is also increasingly AI-powered, so familiarity with implementing AI solutions (RAG etc) is an advantage. You’ll be working on a project where everything is More ❯

with us means having direct involvement in delivering our technical road map and will be working directly on several key product enhancements. You’ll work with Python/Django, Javascript and AWS. Our platform is also increasingly AI-powered, so familiarity with implementing AI solutions (RAG etc) is an advantage. You’ll be working on a project where everything is More ❯

Senior Software Engineer - Full Stack - TypeScript, Node React, AWS, Serverless, DynamoDB - Energy & Utilities Cleantech SaaS Location: Hybrid/Remote - London (flexibility available) Salary: Up to £80,000 About the Company This role is with, in our opinion, one of the More ❯

Senior Software Engineer - Full Stack - TypeScript, Node React, AWS, Serverless, DynamoDB - Energy & Utilities Cleantech SaaS Location: Hybrid/Remote - London (flexibility available) Salary: Up to £80,000 About the Company This role is with, in our opinion, one of the More ❯

Senior Software Engineer - Full Stack - TypeScript, Node React, AWS, Serverless, DynamoDB - Energy & Utilities Cleantech SaaS Location: Hybrid/Remote - London (flexibility available) Salary: Up to 80,000 About the Company This role is with, in our opinion, one of the More ❯

Senior Software Engineer - Full Stack - TypeScript, Node React, AWS, Serverless, DynamoDB - Energy & Utilities Cleantech SaaS Location: Hybrid/Remote - London (flexibility available) Salary: Up to 80,000 About the Company This role is with, in our opinion, one of the More ❯

seamless user experiences while integrating AI features and third-party data sources in a collaborative Agile environment. What They're Looking For: ✅ 1-3 years full-stack development experience ✅ JavaScript/TypeScript + modern frameworks (React, Vue, or Angular) ✅ Backend experience (Node.js, Python) ✅ Strong understanding of APIs and databases (MongoDB) Bonus Points: 🔹 Fintech or lending experience 🔹 AWS/cloud platforms More ❯

seamless user experiences while integrating AI features and third-party data sources in a collaborative Agile environment. What They're Looking For: ✅ 1-3 years full-stack development experience ✅ JavaScript/TypeScript + modern frameworks (React, Vue, or Angular) ✅ Backend experience (Node.js, Python) ✅ Strong understanding of APIs and databases (MongoDB) Bonus Points: 🔹 Fintech or lending experience 🔹 AWS/cloud platforms More ❯

seamless user experiences while integrating AI features and third-party data sources in a collaborative Agile environment. What They're Looking For: ✅ 1-3 years full-stack development experience ✅ JavaScript/TypeScript + modern frameworks (React, Vue, or Angular) ✅ Backend experience (Node.js, Python) ✅ Strong understanding of APIs and databases (MongoDB) Bonus Points: 🔹 Fintech or lending experience 🔹 AWS/cloud platforms More ❯

seamless user experiences while integrating AI features and third-party data sources in a collaborative Agile environment. What They're Looking For: ✅ 1-3 years full-stack development experience ✅ JavaScript/TypeScript + modern frameworks (React, Vue, or Angular) ✅ Backend experience (Node.js, Python) ✅ Strong understanding of APIs and databases (MongoDB) Bonus Points: 🔹 Fintech or lending experience 🔹 AWS/cloud platforms More ❯

Kubernetes, Docker) What you'll bring: 2-4 years' experience in AppSec/DevSecOps Hands-on with tools like Checkmarx, Veracode, SonarQube, OWASP ZAP Strong coding skills (Java, Python, JavaScript, Go, .NET) Familiar with CI/CD (Jenkins, GitHub Actions, Azure DevOps) and IaC (Terraform) Knowledge of OWASP Top 10, API security, and compliance (ISO 27001, SOC 2) Eligibility for More ❯

level aptitude for technology Education to at least a BSc level or higher in Computer Science or Mathematics from a Russell Group University or equivalent. Desirable skills: HTML5, CSS, JavaScript Multi-threaded application development Understanding of Windows technologies WPF If you feel you have the skills and experience required for this opportunity, please apply or contact RyanOatley@SpectrumIT.co.uk More ❯

level aptitude for technology Education to at least a BSc level or higher in Computer Science or Mathematics from a Russell Group University or equivalent. Desirable skills: HTML5, CSS, JavaScript Multi-threaded application development Understanding of Windows technologies WPF If you feel you have the skills and experience required for this opportunity, please apply or contact RyanOatley@SpectrumIT.co.uk More ❯