Senior software developer jobs in Welwyn Garden CityCreate job alerts

You’ll join a smart, collaborative team that pushes each other to articulate and defend every architectural decision in pursuit of best‑in‑class software. Whether you’re refining our Azure architecture as CTO or shipping revenue‑critical features as Senior Dev, you’ll set high standards

We’re hiring a Senior Software Developer with experience in IBM Business Automation to support the delivery of process-driven applications within a large, complex organisation in the healthcare sector.

Company DescriptionEstablished in 1987, QBS Software provides a platform for software companies and channel resellers to increase efficiency and achieve growth. We are a technology company with a focus on software covering the enterprise, cloud and consumer markets.

We’re looking for a Senior Software Developer with experience in IBM Operational Decision Manager to build and maintain rule-based decision services within a complex enterprise environment. Collaborating with developers and architects across the wider platform.

Senior Full Stack Developer - Remote - Competitive SalaryI'm working with an exciting organisation that is looking to appoint a Senior Full Stack Developer to help design and deliver secure, cloud-native applications within a modern Microsoft and Azure ecosystem.

Senior Software Developer (Voice / SIP Platforms)£55,000 £65,000 DOE | Hybrid Working (1x day a month office)Are you a seasoned developer with a passion for building robust, real-time communications platforms? Looking for a role w

Senior Software Developer BathAre you an experienced Software Developer passionate about collaborative development and fostering growth in others? A dynamic company in Bath is looking for a Senior Software Developer to join their innovative team.

As Senior Software Developer for the Dementia Research Institute (DRI) Centre for Care Research and Technology, you’ll be developing. You will serve as a senior member of the Centre’s software team. We are seeking exceptional software engineers who can thrive in a collaborative and innovative en

A leading SaaS organization in the UK is looking for a mid to senior Software Developer to join their team.

The Monitoring Senior Software Developer plays a key role in designing , implementing , and maintaining advanced monitoring solutions across broadcast and media systems.

A small dedicated software company is seeking a skilled Senior Developer to join their team in Solihull.

Experience across the full software development lifecycle. This role supports the full life cycle of software development, and includes the opportunity for hands-on coding. Degree in Software Engineering, Computer Science, Information Technology or similar.

A Software Developer is a technical role within our organisation. Comfortable demonstrating solutions to senior stakeholders. Experience with building integrations to third party software (SaaS) products.

Role: Senior Systems Developer (Python / PostgreSQL). A leading UK infrastructure and utilities organisation is looking to hire a Senior Systems Developer to join their growing technology team. This is a fantastic opportunity to play a key role in designing and delivering modern software solutions w

As a Senior Consultant, you will be aspiring leader within our DDaT team and will work alongside an experienced pool of other software developers, solution architects, product owners, project managers, business analysts, data scientists and AI experts, among others. We have a fantastic opportunity f

As a Senior Software Developer, you will act as an architect building Python applications, high-quality tools, services, and web front-end UIs that enable award-winning VFX and feature animation work. Work collaboratively under tight deadlines; mentor developers, assign tasks where appropriate, and

Developers conceive, specify, design, engineer, document, test, and deliver bug fixes as needed to provide high quality software solutions. Senior C# Developer – Analytics Development Team (London). The Software Development function creates and maintains applications, frameworks and other software

Senior Full-Stack Software Developer, UK. We’re looking for a Senior Full-Stack Software Developer to build high-impact features powering high-volume systems in the live-event space. Seasoned full-stack developer with 5+ years of experience.

As Senior Web Developer, be part of our FlexONE team and own critical product surfaces across our web and mobile applications. We are looking for an amazing developer to join our team building FlexTrade's OEMS platform, FlexONE, which is our state-of-the-art, fully integrated Order Management System

Senior C# Developer – Analytics Development Team (London). Reporting to the CEO, Technology provides digital tools, software services and infrastructure globally to all business groups. Software development and support teams work in agile ‘streams’ aligned to specific business areas.

Senior Software Developer in Test. Senior Software Developer in Test. Quality Engineering, Software Testing, RPA, and DevOps.

We're seeking Senior Python Developers to join our back-end development team. An in‑person meeting with our senior leadership team and co‑founders at our office.

As a Senior Lead Software Engineer at JPMorgan Chase within the Corporate Technology Market Risk team, you will lead the rapid expansion of a strategic visualization and reporting platform. Actively contributes to the engineering community as an advocate of firmwide and Risk Technology frameworks, t

TrueNorth are working with a successful tech consultancy who work heavily in the public sector - we're looking for a Senior Java Software Engineers for some immediate contract roles.

Senior Software Developer - Market Making Technology. In this role as a Market Making Senior Software Developer, you will work closely with both business stakeholders and engineering teams to identify, design, and deliver products that strengthen our market making capabilities and improve operationa

Digital, Information & Technology (DIT) Senior Software Developer - MoD - SEO (IT) — United Kingdom.

Vacancy for Senior Software Developer at The National Archives. Vacancy for Senior Software Developer at The National Archives. We are looking for a Senior Software Developer with extensive experience working within the Django web and rest frameworks and ideally with Wagtail CMS development experien

An exciting new permanent opportunity has become available for a Senior Developer, to join a juggernaut organisation in the recruitment industry. They're looking for numerous Senior Developers to lead technical initiatives in a dynamic, AI-driven environment. To apply for the Senior Developer positi

TherapyNotes is seeking a Senior Software Developer to join our growing team. Experience in event-based software design and event-driven architecture. We're a dynamic team of pros who love to innovate and push the envelope, keeping our software cutting-edge.

Senior Software Developer (Python). Olive Jar Digital is seeking a Senior Software Developer to help build, refine, and enhance high‑fidelity AI prototypes and supporting services across several Discovery and Alpha initiatives. With a huge growth plan over the next two years, we are expanding our

As a Senior Software Developer, you’ll be an integral part of our agile development team, contributing to the delivery of secure, scalable, and innovative software solutions. You’ll work closely with product, QA, and support teams to continuously improve our software delivery process and help sh

Senior Full-Stack Software Developer, UK. We’re looking for a Senior Full-Stack Software Developer to build high-impact features powering high-volume systems in the live-event space. Seasoned full-stack developer with 5+ years of experience.

Senior Software Developer with a Backend Focus. To professionalise our product development and continue our growth path, we are currently looking for a senior backend developer. Senior backend skills with at least 5 years of experience with Java, and a good understanding of Python (FastAPI, Flask…

We are looking for a Senior Backend Developer (Java) to take a leading role in building the technical foundations that enable AI agents to operate across Tradedoubler. We are looking for a Senior Backend Developer (Java) to take a leading role in building the technical foundations that enable AI age

A leading recruitment firm is seeking a Senior Software Developer in the UK to join a dynamic team. The successful candidate will utilize their skills to produce scalable software solutions, contributing across the entire software development cycle. Responsibilities include collaborating with teams,

As a Senior Front‑End Developer, you will help shape a high-profile UK public‑sector digital service, delivering an accessible and efficient experience for end users. Proven mentoring and cross‑functional collaboration delivering user‑centric software. When you join the team at NEC Software

Senior SDET – £675-£720pd (Inside IR35) – 2 yr programme (6 mth) – Hybrid/3 days pw London. A financial services client based in London are looking for a Senior SDET to work within their asset management team. Firm understanding of agile software engineering practices (I.

At Point of Rental Software, we revolutionize the rental industry by providing cutting‑edge, comprehensive software solutions tailored to our customers' needs. We are looking for a talented Senior AI Engineer to join our growing UK team. Experience using AI tools in a software environment (Claude,

Are you a creative problem-solver who thrives in a fast-paced, experimental environment? Do you relish the challenge of building prototype software quickly, testing ideas, and learning from failure as much as success? Mustard Systems is seeking a Senior Software Developer to join our talented Horse

Full stack developer with Front- or Back- end specialization (Mid level, based in SA) – Join to apply for the Full stack developer with Front- or Back- end specialization (Mid level, based in SA) role at Dealstack. Following strong commercial traction from leading industry players, we are looking

In this role as a Market Making Senior Software Developer, you will work closely with both business stakeholders and engineering teams to identify, design, and deliver products that strengthen our market making capabilities and improve operational efficiency across the business. Technology provides

Role: Senior Software Developer. Collaborate with other senior engineers to drive platform quality and stability. A global financial services organisation is growing a senior Java engineering team to support a strategic, business-critical technology platform.

Senior Software Developer Remote with ad-hoc travel to Manchester | Experience within UK central government required. Proven experience as a Senior Software Developer in complex environments. Share knowledge and mentor junior developers where needed.

If you’re energised by building intuitive, meaningful software - and love the idea of your work supporting churches and charities every day - then we’d love to meet you. We’re passionate about crafting quality software, and we’re looking for someone who shares that passion, with at least 5 y

Gain experience in high-security, mission-critical software projects. This role offers an exciting opportunity to lead projects, mentor junior developers, and work on high-impact, secure banking solutions. This role is ideal for developers with strong technical expertise who are looking to grow into

We are a small but rapidly growing team of mathematicians, data scientists and software engineers constantly striving to refine our world class statistical models while also researching and deploying new ones. Our work bridges three domains, each challenging in its own right - iGaming, quantitative

Tangible is a fast-growing, tech-driven platform providing liquidity solutions to LPs and GPs in the private-markets secondaries space.By combining deep sector expertise with modern infrastructure, we unlock liquidity across private equity, private credit, and real assets, transforming the industry