javascript jobs in London

Duration: 6 months (Possibility of extension or conversion to FTE)Location: Toronto or Waterloo (95% remote; occasional onsite attendance for training, working sessions, or team needs)After‑Hours Support: Required on a rotational basis (1–2 evenings/week for deployments) *Must be eligible for Reliability Clearance (Must have lived in Canada for the...

About OpenSignal:   We’re building the most comprehensive data set on wireless networks in the world. We want to know which mobile networks are the best in any area, where the best wi-fi hotspots are located and how you can get better signal on your cell phone in realtime. We do this by crowd-sourcing data from users of our mobile application – data...

The Center for New York City Affairs is seeking a part-time Web Developer to support the education team. Serving the largest school district in the country, the education team is committed to helping improve the quality of New York City schools for all families, especially communities in poverty and of color. The education team offers support to NYC families...

A tech-driven charity platform in Greater London is seeking an experienced full stack developer to play a crucial role in shaping their innovative software. The candidate will be responsible for writing front-end and back-end code in JavaScript and TypeScript, and will work collaboratively on architecture and feature development. Prior experience in the...

Zuora is seeking a developer for their London office to contribute to Zephr, a key subscription experience platform. This role involves creating innovative solutions for a high-throughput application and developing secure APIs. Candidates should be proficient in Java or Kotlin, with experience in JavaScript or TypeScript. A strong commitment to testable code...

Job DescriptionTalan is seeking a skilled C# Developer with REACT experience to join our delivery teams working on Front Office platforms within Global Markets environments.In this role, you will design, build, and enhance regulatory, alerting, and sales enablement solutions, supporting front-office users in fast-paced trading environments. You will work...

DescriptionBuild technology that helps the world’s leading insurers make better decisionsAt Verisk, we combine data, analytics, and technology to help businesses make informed decisions and solve complex challenges. Our solutions power some of the world's most recognized insurance organizations, helping them operate smarter, faster, and with greater...

Application Security Engineer / AppSec Engineer / Cloud Security Engineer Hybrid London (2 days in-office) | Competitive Salary + Bonus + Benefits Are you passionate about securing cutting-edge digital platforms in a fast-moving fintech environment? We're seeking an experienced Application Security Engineer to play a vital role in safeguarding our cloud...

Who We Are Konrad is a next generation digital consultancy. We are dedicated to solving complex business problems for our global clients with creative and forward-thinking solutions. Our employees enjoy a culture built on innovation and a commitment to creating best-in-class digital products in use by hundreds of millions of consumers around the world. We...

ADD REQ ID As a Forward Deployed Engineer (FDE) you will work with customers to build and productionize solutions to their data & AI challenges using the Databricks platform. You will own the architecture, lead design decisions, and implement end-to-end systems spanning data engineering, AI, and application development. We work cross-functionally to shape...

Company DescriptionOverviewSpecialist role DeveloperSummary of the work UKTI Digital has been tasked to investigate and build a number of services, both internal and external facing, and is actively looking to expand its already passionate and strong technical team and requires a senior frontend developer experienced in user research-driven development...

Join the Growth Story at Envitia   Envitia operates at the heart of the UK’s most sensitive and high-profile operations. Our approach is entirely mission-focused, enabling customers to see more, decide faster, and act with confidence across complex domains.   We deliver situational awareness and information advantage across C5ISR, fusing cyber,...

Company DescriptionVersion 1 has celebrated 30 years in business and continues to be trusted by global brands to deliver technology and transformation solutions that drive customer success. Our deep expertise enables our customers to navigate the rapidly evolving technology landscape. We foster strong partnerships with global technology leaders including...

Hi! This is the Flipper team. We are the creators of Flipper Zero — a portable device for tech enthusiasts and engineers. It's a gadget with an awesome community that brings together millions of people around the world. We are currently developing a new product — the BUSY Bar productivity multitool. It's a smart device that helps you stay focused and...

Placements24 is seeking a Frontend Developer to join our IT team in East London. You will build engaging, responsive interfaces for our web applications, working with UI/UX designers and backend developers to translate designs into high-quality experiences.The ideal candidate brings solid HTML5, CSS3, and JavaScript skills, experience with React, Angular, or...

Our client is a financial planning partner and investment management business that gives access to the knowledge needed to plan for the future. Until now, there’s been nowhere for people to go for help to structure their personal finances, so their goal is to help its clients create and personalise their financial planning and takes ongoing...

Position Overview:  We’re looking for a Junior UX/UI Engineer - a hybrid creative technologist who combines strong design skills with a solid technical foundation in front-end development. In this role you will be working closely with the team to create intuitive experiences for our web-based trading and enterprise platforms. You’ll help bring...

DescriptionSenior Application Security Engineer   Fortinet is looking for a Sr. Application Security Engineer to join the Corporate Information Security team. This is a highly technical role, with responsibilities conducting security reviews on various Fortinet applications, providing security education to our engineers and handling externally reported...

C3 AI (NYSE: AI), is the Enterprise AI application software company. C3 AI delivers a family of fully integrated products including the C3 Agentic AI Platform, an end-to-end platform for developing, deploying, and operating enterprise AI applications, C3 AI applications, a portfolio of industry-specific SaaS enterprise AI applications that enable the digital...

Job DescriptionRole Description:  They are looking for an expert Full Stack Developer to join a new team building web applications and services at the frontline of our financial markets franchise. The candidate is expected to design overall architecture of the web application. Maintain quality and ensure responsiveness of applications. Collaborate with the...