Senior Software Engineer Jobs in London, UK

Join our development team and play a key role in our expanding Engineering Services function. You'll help enhance our innovative analytics and rapid delivery platform as we digitise and modernise the Commodities and Global Markets platforms and applications. Leveraging cutting-edge technologies, you'll enable the business to scale and seize new opportunities with agility. At Macquarie, our advantage is bringing together diverse people and empowe...

Senior Software Engineer | ~ 950/day Outside IR35 | 6-months initial contract | London Industry: Trading Location: London - 4 days in office Job Type: Contract - 6-month initial Our client is building the next generation of execution and order management (EMS/OMS) infrastructure for global commodities trading. You will join a small, fast-moving engineering team designing and delivering a cloud-native trading platform from the ground up, tightly ...

Software Engineer (Golang) - Contract 6 months initial | Outside IR35 | Remote (occasional travel to Manchester / London) | BPSS required Client: Pixel Global (DWP) We're looking for a Golang Software Engineer to drive automation and process optimisation across a major government programme What you'll be doing: Building in Golang, creating frameworks to enable scalable automation Working with stakeholders to pilot and embed repeatable automated ...

Senior Software Engineer (Backend) London - Hybrid (3 days in office) Up to 85k + benefits What if the systems you built were used every day by millions of readers around the world? A long-established, AI-driven technology business is hiring a Senior Software Engineer to work on products used daily by leading global media and publishing organisations. Founded over a decade ago, the company builds data-driven, machine-learning-led products that o...

<div class="content-intro"><p><span style="font-family: verdana, geneva, sans-serif; font-size: 12pt;"><strong>We’re Capital on Tap 👋<br></strong></span><span style="font-family: verdana, geneva, sans-serif; font-size: 12pt;">💳 Capital on Tap started because small businesses were underserved. Big banks were slow, their products weren't fit for purpose, and small business owners often couldn't access what they needed. We set out to fix that.</span></p> <p><span style="font-family: verdana, geneva, sans-serif; font-size: 12pt;">Today we're a financial platform - not just a credit card company. We offer a best-in-class business credit card, SME-focused spend management platform, a savings product that hit £1 billion in funds within its first year, and a growing suite of tools and financial products that make running a small business easier. </span></p> <p><span style="font-family: verdana, geneva, sans-serif; font-size: 12pt;">1,000+ employees, £20bn in annual card spend, 200,000+ customers, 17,000+ Trustpilot reviews averaging 4.7 stars, and we're profitable. We’ve done a pretty good job so far, but we’re just getting started! </span></p></div><p><span style="font-family: helvetica, arial, sans-serif;">🏡🏢This is a hybrid role, our engineering teams work from our London (Moorgate) Office 2 days per week.</span></p> <p><strong>The Role</strong></p> <p class="font-claude-response-body break-words whitespace-normal leading-[1.7]">We're looking for Senior Software Engineers to help us build the products that small businesses across the UK and US rely on every day. You'll work across cross-functional teams alongside Product Managers, QA Engineers, and fellow Software Engineers, owning problems end to end, from the first line of code through to production, monitoring, and continuous improvement.</p> <p class="font-claude-response-body break-words whitespace-normal leading-[1.7]">This isn't a role for someone who wants to be handed a ticket and told what to build. We're looking for engineers who understand the problem, challenge the approach when it needs it, and take pride in the quality of what they ship. We only build what the customer wants.</p> <p class="font-claude-response-body break-words whitespace-normal leading-[1.7]"><br><span style="font-family: helvetica, arial, sans-serif;"><strong>What You’ll Be Doing</strong> </span></p> <ul> <li class="font-claude-response-body break-words whitespace-normal leading-[1.7]"><span style="font-family: helvetica, arial, sans-serif;">Designing and building robust, scalable solutions in .Net/C#, taki

Senior Software Engineer (FullStack) at Birdie. Apply via Ashby.

Senior Software Engineer at Carbonre. Apply via Ashby.

Senior Software Engineer, Scale at Airwallex. Apply via Ashby.

Senior Software Engineer, New Products at Airwallex. Apply via Ashby.

<p class="Lexical__paragraph"><strong><strong class="Lexical__textBold">Join Proton and build a better internet where privacy is the default</strong></strong></p> <p class="Lexical__paragraph">At Proton, we believe that privacy is a fundamental human right and the cornerstone of democracy. Since our inception in 2014, founded by a team of scientists from CERN, we have dedicated ourselves to providing free and open-source technology to millions worldwide, ensuring access to privacy, security, and freedom online.</p> <p class="Lexical__paragraph">Our journey began with Proton Mail, the largest secure email service globally, and has since expanded to include Proton VPN, Proton Calendar, Proton Drive, and Proton Pass. These tools empower individuals and organizations to take control of their personal data, break away from Big Tech’s invasive practices, and defeat censorship. Our work impacts hundreds of millions of lives, from activists on the front lines defending freedom to leaders in governments protecting sensitive information. In some cases, Proton’s services have even been instrumental in saving lives by enabling secure and private communications in high-risk situations.</p> <p class="Lexical__paragraph">Proton is a profitable company that does not rely upon VC funding, supporting over 100 million user accounts with a growing team of over 500 people from over 50 different countries, from the world's top companies and universities. We value intelligence, learning potential, and ambition in our hiring process. Adaptability is key as we navigate uncharted territories and redefine how business is conducted online.</p> <p class="Lexical__paragraph">Hiring at Proton is highly selective, with less than 1% of candidates hired. We believe smaller teams of exceptional talent will always prevail over larger teams with lower talent density. You will have the opportunity work with many of the world's top minds in their fields, ranging from former international math and science olympiad winners to chess champions.</p> <p class="Lexical__paragraph">We have a global mindset and big ambitions but remain a start-up at heart. We value empowerment and flexibility and keep our structure flat to keep moving fast and avoid unnecessary politics. Tired of blending into the crowd? Join us and do work you can truly be proud of. Check our <strong><strong class="Lexical__textBold">open-source </strong></strong>projects <a class="Lexical__link" href="https://proton.me/community/open-source"><strong><strong class="Lexical__textBold">here</strong></strong></a><strong><strong class="Lexical__textBold">!</strong></strong></p> <p class="Lexical__paragraph"><

Senior Software Engineer - Cards Experience EU at Perk. Apply via Ashby.

Senior Software Engineer, Content Agent at Sanity. Apply via Ashby.

Senior Software Engineer - Policy & Control at Perk. Apply via Ashby.

Senior Software Engineer - Billing (VAT & Invoicing) at Perk. Apply via Ashby.

Senior Software Engineer - Flights at Perk. Apply via Ashby.

Senior Software Engineer, Docker Agents (London) at Docker. Apply via Ashby.

Discover your future at Citi Working at Citi is far more than just a job. A career with us means joining a team of more than 230,000 dedicated people from around the globe. At Citi, you'll have the opportunity to grow your career, give back to your community and make a real impact. Job Overview FX Client & Sales Technology - Senior Software Engineer (SVP) Engineer the future of global finance. At Citi, our Tech team doesn't just support fina...