1,715 Computer Programmer jobs in the United Kingdom

Tessl is a Series A startup based in London, founded by Guy Podjarny. The company has raised over $100m in funding from investors including Index Ventures, Accel, GV and Boldstart. In June 2025, Tessl was ranked #2 in Sifted EU’s 2025 B2B SaaS Rising 100.

At Tessl, we believe AI will truly transform software development. AI Native Developers will define features, architecture and workflows in specs, not code, used to guide the work of AI agents. We are shaping this new paradigm, and building the pioneering platform for AI Native Development, and leading the dev movement and ecosystem that drive it.

As an early member of our team, you’ll have the opportunity to shape the future of how software is created and maintained. The easiest way to understand our vision is to visit ainativedev.io our developer community website, dedicated to AI Native Development, which is the go-to place for developers navigating the evolving AI-driven software landscape.

Join our engineering team to build real-time AI Native workflows, tooling, and interfaces that will reshape how developers create and maintain software.

As a Software Engineer, you’ll be versatile and independent, excited to work with cutting-edge AI tools to build great products. We move quickly, but with purpose - balancing speed with collaboration and thoughtful execution. You’ll collaborate closely with product, design, and the wider Engineering team to bring AI Native development to life in a fast-paced, high-trust environment.

No two days will be the same at Tessl! You’ll have a high level of autonomy and be able to make decisions based on what you believe will help you deliver the most success. Here’s an insight into just a few of the things you would be doing:

• Design and implement new functionality that you discussed and reviewed with the product team

• Spin up a proof of concept to showcase an innovative idea you’ve been thinking about

• Rapidly prototype a new language integration for our code generation pipeline, then develop a plan for a scalable implementation.

• Pair with a designer to fine-tune interactions in the UI, CLI or existing AI coding agents, making the user experience more intuitive and slick

• Integrate a third-party service , e.g. for notifications, so we can focus our own cycles on Tessl’s core capabilities

• Collaborate with other teams to plan an architecture that supports collaboration across the platform

• Establish an end-to-end testing strategy to increase our confidence when deploying new features to production

• Share your technical vision for a new product capability you’ll be leading with the wider engineering team for feedback and alignment

• Proven experience (typically 5+ years or equivalent) as a Software Engineer . You care about code modularity, structure and aesthetics and have firsthand experience in how software is built across teams and environments

• Equally comfortable contributing to a mature codebase with strict CI criteria or hacking up a quick prototype to prove/disprove an assumption

• Proven experience leveraging the best AI coding tools and agents to accelerate and enhance your own work and efficiency

• Comfortable with fast-paced, high-autonomy environments: you’ve ideally thrived in an early-stage startup before

• You have demonstrated usage of AI tools in your day-to-day work , and be excited about experimenting, learning, and harnessing the potential of new AI tools and approaches to transform software engineering

• Background in AI products or developer tools

• Experience in rapid prototyping environments

• Programming polyglot experienced in several languages of different paradigms (e.g.: JavaScript/TypeScript, Python, C or C++, Haskell, etc.)

• Experience collaborating with AI researchers and bridging between research-focused and engineering-focused teams

• Experience building & scaling REST APIs , particularly those conforming to JSON:API

• Comfortable working on infrastructure (e.g., setting up CI pipelines, navigating Kubernetes)

• If you have a personal or open-source project you’d like to share, we’d love to see it (GitHub links welcome!)

Office: Our brand new 10,000 sq. ft office is in the AI hub of Kings Cross, London. We have generous catering and have regular social events such as team lunches, drinks and more. We require all staff to be in our London HQ at least 3 days a week on our anchor days of Monday, Tuesday and Thursday.

Salary : We offer a competitive salary based on experience and skills, benchmarked against industry standards.

Benefits : 25 days holiday, health insurance, including dental and vision, which extends to partners and dependents, as well as a company-matched pension. We also provide a commuting stipend for those who live outside London, and a cycle to work scheme.

Here’s an outline of what you can expect during our interview process:

1. Introductory Call with one of our engineering leaders

   A relaxed chat to learn about your background, interests, and career goals. We’ll also share more about the role, Tessl’s vision, and answer any questions you have.

2. Take-Home Exercise

   You’ll receive a practical challenge based on real scenarios you might tackle at Tessl: an opportunity to showcase your approach to problem-solving on your own schedule.

3. On-site Technical Session

   You’ll pair with two of our lead engineers to build on your take-home exercise. This session simulates working together on real problems and allows us to explore your technical expertise more deeply.

4. Culture Conversation with our People Lead

   A two-way dialogue about our values, team dynamic, and your motivations. Feel free to ask about life at Tessl, growth opportunities, or anything else you’re curious about.

5. Leadership Discussion with Maurilio (Head of Engineering), and potentially Guy Podjarny (CEO) or Ben Galbraith (Head of Product)

   Our final stage focuses on strategic alignment and long-term vision. You’ll learn more about Tessl’s roadmap and learn more about how you could contribute to our mission.

Throughout the process, if you have any specific requirements or need adjustments, please let us know: we’re happy to accommodate.

We care deeply about the warm, inclusive environment we’re building at Tessl and we value diversity – we welcome applications from those typically underrepresented in tech. If you like the sound of this role but are not totally sure whether you’re the right person, do apply anyway!

• On Tessl, The AI Native Development Startup

• Announcing Our $125M Series A for AI Native Software Development

• On the Podcast: Intercom Co-Founder Des Traynor on AI Autonomy & what AI Native means

About Faculty

At Faculty, we transform organisational performance through safe, impactful and human-centric AI.

With more than a decade of experience, we provide over 350 global customers with software, bespoke AI consultancy , and Fellows from our award winning Fellowship programme .

Our expert team brings together leaders from across government, academia and global tech giants to solve the biggest challenges in applied AI.

Should you join us, you’ll have the chance to work with, and learn from, some of the brilliant minds who are bringing Frontier AI to the frontlines of the world.

As a Full Stack Engineer you will be working closely with one or multiple of our delivery teams who are responsible for visualising insights from the output of our data scientists.

Working within the Professional & Financial Services team, you'll have the opportunity to deliver solutions to some of the most unique challenges facing customers in that space using AI and Machine Learning, examples of which can be foundhere .

This role will evolve alongside business needs, but you can expect your key responsibilities to include

• Creating reliable, reusable and scalable frontend and backend to enable better delivery of AI systems

• Leading engineers in a cross-functional team of Data Scientists, Product Managers and Commercial staff to deliver technically sophisticated, high-impact systems.

• Leading on the architecture and design of projects

• Offering leadership and management to more junior engineers on the team

• Be the go to authority for engineering across the stack within your team

• Providing technical expertise to our customers

At Faculty, your attitude and behaviour are just as important as your technical skill. We look for individuals who can support our values, foster our culture, and deliver for our organisation.

To succeed in this role, you'll need demonstrable experience in the following:

• Strong proficiency in TypeScript and experience with modern front-end frameworks such as React or Vue.

• Solid experience with back-end development using Typescript/Python frameworks (Flask, FastAPI, or Django is a plus)

• Understanding of UI/UX principles and ability to create intuitive user experiences

• Proven ability to work in both rapid prototyping mode and to ship/maintain large-scale products

• Knowledge of modern front-end testing frameworks like Jest or Cypress

• Familiarity with deploying software for Cloud Environments (AWS/Azure/GCP) (IaC experience such as Terraform is a plus)

• Experience with containerisation technologies like Docker (Kubernetes experience is a plus)

• Excellent problem-solving skills and ability to debug complex issues

• Strong communication and collaboration skills, with the ability to work effectively in a team environment

• Excitement about working in a dynamic role with the autonomy and freedom you need to take ownership of problems and see them through to execution

• Contributions to open-source projects or personal side projects demonstrating passion for software development

We like people who combine expertise and ambition with optimism -- who are interested in changing the world for the better -- and have the drive and intelligence to make it happen. If you’re the right candidate for us, you probably:

• Think scientifically, even if you're not a scientist - you test assumptions, seek evidence and are always looking for opportunities to improve the way we do things

• Love finding new ways to solve old problems - when it comes to your work and your professional development, you don't believe in ‘good enough’. You always seek new ways to solve old challenges

• Are pragmatic and outcome-focused - you know how to balance the big picture with the little details and know a great idea is useless if it can't be executed in the real world

• Have experience in working directly with clients and end users to conduct: Requirements Gathering, Technical Planning and Scoping

• Have a drive to learn new technologies and novel applications of existing technologies

The Faculty team is diverse and distinctive, and we all come from different personal, professional and organisational backgrounds. We all have one thing in common: we are driven by a deep intellectual curiosity that powers us forward each day.

Faculty is the professional challenge of a lifetime. You’ll be surrounded by an impressive group of brilliant minds working to achieve our collective goals.

Our consultants, product developers, business development specialists, operations professionals and more all bring something unique to Faculty, and you’ll learn something new from everyone you meet.

This Salesforce Software Engineer will work closely with existing in-house technology, data and operations teams, and will play a key role in defining the overall solution design and build, and to then ensure its correct implementation.

Responsibilities:

• Lead the design, development, and implementation of Salesforce solutions tailored to meet the specific needs of our financial services business.
• Collaborate with stakeholders, including sales, marketing, and operations teams, to gather requirements and translate them into scalable Salesforce solutions.
• Configure and customize Salesforce features, including flows, triggers, Asynchronous processes, reports, and dashboards, to optimize business processes.
• Oversee system integrations between Salesforce and other applications, ensuring data integrity and seamless information flow.
• Provide technical guidance and mentorship to a team of Salesforce developers, ensuring high-quality code and adherence to best practices.
• Stay updated on Salesforce releases and new features, assessing their potential impact and recommending enhancements to maximize system efficiency.
• Collaborate with cross-functional teams to define and implement data governance policies and security protocols.
• Troubleshoot and resolve issues related to Salesforce configuration, customization, and integration, ensuring minimal disruption to business operations.

Skills/Experience:

• Minimum of 6 years of experience as a Salesforce Developer or Engineer, preferably in the financial services sector.
• Extensive knowledge of the Salesforce platform, including Apex, Visualforce, Lightning Components, Lightning Web Components and Salesforce APIs.
• Good Knowledge on Sales Cloud, Service Cloud, Experience Cloud.
• Additional Knowledge on Geogrid, Google Maps or Esri maps implementation along with Salesforce Managed packages such as Conga , Conga Batch , Salesforce Maps.
• Agile Software Project Management methodologies such as SCRUM and experienced on Dev Ops tools such as ADO Boards and Jira for tracking purpose and project management purpose.
• Strong understanding of Salesforce architecture, data modeling, and security best practices

We’re looking for an experienced CNC Programmer/Setter/Operator to join our precision engineering team in Thatcham, RG19 6HN. In this role, you’ll be responsible for programming, setting and operating multi-axis CNC machines to deliver complex, high-end components with exceptional accuracy for the Aerospace, Defence and Automotive industries using advanced 4 & 5-axis CNC milling machines and CNC Turning Centres.

39.5 hours per week, Mon to Thur 08.30 – 16.30 & Fri 08.30 – 16.00

You will receive:

• A competitive salary
• 25 days annual leave (plus

CNC Programmer – Ficep / Kaltenbach / Peddinghaus | Leeds | £35-£0k

Location:
Leeds |
Salary:
5,000–£4 000 |
Hours:
40 per week, core 8:30–17:00

Are you a skilled CNC programmer in structural steel?

Join a leading Leeds-based structural steel business as a
CNC Programmer
. This role focuses on
programming, optimising, and managing CNC machine programmes
for Ficep, Kaltenbach, and Peddinghaus and Voortman machinery.

What you'll do:

• Program, optimise, and maintain CNC programmes for steel processing machines.
• Work with
  VACAM, Steel Projects, Peddimat, BEAMDrill
  software.
• Read and interpret CAD files, DSTV data, and engineering drawings.
• Troubleshoot programming issues and maintain accurate programme libraries.
• Ensure high-quality outputs meet structural steel standards.

What we're looking for:

• Proven CNC programming experience within a structural or heavy steel environment
• Knowledge of
  Ficep, Kaltenbach, or Peddinghaus machinery
  .
• Desirable: experience on
  Voortman machines
  , ERP/MRP systems, or nesting software (training can be provided)
• Strong attention to detail, problem-solving skills, and precision.

Why this role?

• £3 0k per year, depending on experience.
• Permanent, full-time, on-site in Leeds.
• Excellent career development in a high-performing structural steel environment.

Optiver is looking for a Software Engineer to join our Developer Experience team. This team is crucial in building the tools and platforms that power our development workflows, enabling our engineers to work fast and with confidence. You'll be responsible for building the infrastructure, tooling and automation that power the entire software development lifecycle, from local development to production deployment; the improvements you make to our developer environment will improve the daily workflow of hundreds of developers across multiple regions.

We're looking for a strong engineer with a passion for improving developer experience, an awareness of modern tooling and workflows, with a track record of identifying and implementing high-impact productivity improvements. You'll join a growing global team on a mission to improve every part of the developer experience at Optiver.

What you'll do:

• Design, build and maintain scalable build systems used across the company, including core build libraries, common CI/CD pipelines and Docker images
• Develop tools and integrations that make the local develop-build-test iteration loop faster and more seamless - including IDE extensions, CLI tools and container-based workflows
• Automate processes to streamline the release and deployment lifecycle, enabling rapid, continuous deployment
• Track emerging trends in Developer Experience and AI, exploring and supporting the integration adoption of AI assisted tools and coding agents into daily development workflows
• Help us define meaningful metrics to measure and better quantify developer productivity
• Partner with development teams to identify friction in their workflows and design solutions that simplify their set up, improve iteration speed and enhance productivity

See the team lead's opinion on why DevEx matters here.

Who you are:

• Beneficial to have familiarity designing and optimising containerised build workflows using tools such as Docker, Bazel, CMake, Ninja, Poetry etc
• Skilled in building CI workflows on platforms like GitHub Actions or Jenkins that provide fast, reliable feedback and automate repetitive tasks
• Strong coding fundamentals and experience across both scripting and compiled languages, with a focus on writing scalable, high-quality software
• Have strong engineering instincts and a deep understanding of the end-to-end lifecycle of software development from ideation to deployment
• Passionate about improving the developer experience; with a proven track record of initiating and successfully driving developer productivity improvements at scale through impactful tooling and automation
• Curious, collaborative and eager to work in a high-performing environment that values continuous improvement
• Comfortable working autonomously and collaboratively, with a practical approach to solving real-world challenges

Who we are:
At Optiver, our mission is to constantly improve the market by injecting liquidity, providing accurate pricing, increasing transparency and acting as a stabilizing force no matter the market conditions. With a focus on continuous improvement, we participate in the safeguarding of healthy and efficient markets for everyone who participates. As one of the largest market making institutions, we are a trusted partner of 70+ exchanges across the globe.

What You'll Get
You'll join a culture of collaboration and excellence, where you'll be surrounded by curious thinkers and creative problem solvers. Motivated by a passion for continuous improvement, you'll thrive in a supportive, high-performing environment alongside talented colleagues, working collectively to tackle the toughest problems in the financial markets.

In addition, you'll receive:

• A competitive remuneration package, including a performance-based bonus structure.
• 27 paid vacation days plus all UK public holidays.
• Daily breakfast and lunch, along with support on commuting expenses.
• Private medical insurance, pension scheme, and ClassPass fitness membership.
• Training and continuous learning opportunities, including access to conferences and tech events.
• International

Calnex Solutions is a fast-growing, world renowned, innovative company that develops leading edge products for testing network equipment and network application performance.

Our Engineers work in multi-discipline product development teams that include software and hardware design and system test Engineers. The teams work closely with marketing and sales, turning market and customer requirements into high quality, fully functional products.

We have exciting opportunities for graduates to join our development team this year. Working on real product feature development and mentored by experienced Engineers, this is an excellent opportunity to launch your career working as part of, and learning from, a world class development team who are creating leading edge products.

Key Responsibilities:

• Developing and delivering quality software to timescales based on an outline of the implementation
• Contributing to the architectural development and evolution of the software to keep it flexible and maintainable as market requirements evolve
• Support quality-oriented activities necessary to deliver a product that will delight our customers
• Learn the domain and hence appreciate the real-life use cases of the product features

Essential Skills and Qualifications:

• Educated to Degree level in Computer Science or an equivalent subject
• Grasp of OO design techniques
• Application software development using some of: C#/.NET, C++, Python
• Experience of web development using any of Javascript, Angular, CSS, React and HTML would be beneficial
• Ability to work closely with others in a multi-discipline team
• Ability to respond to tight deadlines in a dynamic environment

Calnex strives to develop its employees through a mixture of work experience and training to provide career advancement.

Calnex rewards success and the salaries of our Graduates are reviewed twice a year. We have an open and supportive culture and, being a smaller Company, our Graduates can quickly get a broad understanding of all aspects of the business. Calnex rewards success and offers competitive salaries. Our comprehensive benefits package includes a contributory pension plan, flexible holidays, life assurance, critical illness cover, private healthcare, performance bonus and an opportunity to join the Calnex Employee Share Incentive Plan.

A critical element of Calnexs ethos is to be a company that people enjoy working for and with. Personality fit and a positive attitude to both fellow employees and all other people that may be encountered while the individual represents Calnex will be a key attribute of the successful candidate.

Take a look at our website to find out more about what we do and what its like to be an employee at Calnex

Please note, the salary range for this role does not meet the minimum threshold required for Skilled Worker Visa sponsorship under the current immigration rules. Therefore, interested applicants must already have unrestricted right to work in the UK.

Calnex are an Equal Opportunity Employer.

In consideration of the General Data Protection Regulation (GDPR), please be aware that by applying for a role in Calnex Solutions directly or via an intermediary you are giving permission for us to retain certain personal information for a period of up to two years. That information includes your CV, cover letter or any other correspondence relating to your application and any notes we may take at interview.