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We build websites and apps for clients across the US and Europe, specializing in decentralized finance (DeFi, crypto, NFT, blockchain), fintech, and healthcare, with occasional work in e-commerce and other verticals.Beyond client work, we operate our own high-revenue web product with a website, mobi

Cititec is looking for a Principal Software Engineer to lead high-impact client engagements in the Energy & Commodities trading space. Candidates should have strong software engineering expertise, particularly in Python and cloud technologies, and be comfortable in stakeholder-heavy environments.

Principal Software Engineer - Product team. We’re looking for a Principal Software Engineer to lead the architecture, design, and evolution of our secure, distributed, cloud-native systems. This is a hands‑on leadership role where you’ll shape engineering strategy while designing and deliverin

Accenture Software & Platform Engineering is over 1,000 people strong and provides end-to-end product engineering solutions which deliver tangible value, fast. As part of our Software & Platform Engineering team, you’ll work with cutting-edge technologies and develop a wide range of new skills on

Icehouseventures is seeking a Principal Application SW Engineer to join our team in Japan, focusing on localising Wayve’s autonomous driving technology. Responsibilities include software bring-up on customer hardware platforms and collaborating with cross-functional teams. Candidates should have 8

Our pay ranges for our Principal Engineer position within London are: £92,818‑£116,122 GBP. Coaching client engineering teams, transferring knowledge and leveling up practices. Bringing depth in testing strategies, observability, fault tolerance, and secure engineering practices.

We need a Principal Engineer who is both an architect of engineering principles and a hands‑on build engineer. Retained Search: Principal Software Engineer (Platform) | London (Hybrid). Creatively integrating controls and compliance into the SDLC so they empower engineers to ship multiple times a

You’ll also mentor engineers, foster best practices in test automation, and help shape our quality engineering capability. Principal Software Developer in Test (SDET). As a Principal SDET at Capco, you'll lead the strategy, architecture, and implementation of robust automation testing frameworks a

Experience with containerization and orchestration technologies (Kubernetes).Ground Floor, Verse Building, 18 Brunswick Place, London, N1 6DZ.

As a Principal Software Engineer, you will lead the architecture and development of highly advanced software systems. Principal Software Engineer - Gram Games. You will provide strategic technical direction, mentor senior engineers, and ensure that software solutions meet business and technical requ

Appvia in London is seeking a Principal Software Engineer to provide technical leadership in modern software systems. The role involves collaboration with delivery managers and engineers to enhance engineering standards and practices.

As a Principal Engineer at M&S, you’ll play a critical role in shaping our technical direction and delivering against our strategic goals. Mentor and support senior engineers, helping to raise the overall engineering capability. Improve engineering quality, reliability, and productivity through be

Mentor and support senior engineers, helping to raise the overall engineering capability. As a Principal Engineer at M&S, you'll play a critical role in shaping our technical direction and delivering against our strategic goals. Working within highly cross-functional teams spanning engineering, data

This is a hands‑on engineering role focused on embedded Linux systems, hardware integration, and low‑level software development within a multidisciplinary environment spanning embedded systems, cloud platforms, computer vision, and application software. Strong embedded software engineering backg

Following significant growth within their trading practice, they are looking to hire a Principal Software Engineer to lead complex, high-impact client engagements across data, AI, and software engineering initiatives. Strong software engineering experience with Python and modern cloud technologies.

Light is seeking a Principal Engineer in London to lead AI integration and technical strategy. You will collaborate with clients, guide technical direction, and mentor teams to ensure high-quality software solutions.

Our Software Engineers don't just implement solutions—they discover new patterns of working with AI that. Provide deep technical guidance to multiple engineering teams across projects. Collaborate with product and AI leadership to align software strategy with company goals.

Senior/Principal Software Engineer. We’re looking for Senior and Principal Engineers who want to shape meaningful systems, influence technical direction, and work alongside capable people who care about doing the job properly. Department: Software Engineering.

About 7+ years of experience in Software Engineering, Quality Engineering, or related roles, contributing to complex systems in production. Consulting/Principal Software Engineer. The SciVal Development Team is a cross-functional group comprising Frontend, Backend, and Quality Engineers who work clo

We’re looking for a Principal Software Engineer to play a key role in shaping and evolving a scalable technology platform within a highly collaborative engineering environment. Principal Software Engineer (C#) | London | £110,000-£130,000. This is an opportunity to combine hands-on technical lea

Solid understanding of software engineering best practices, including testing, code review, and documentation. Own technical planning: break down roadmap items into well‑scoped engineering work, lead estimation, and drive architectural decision records (ADRs). Experience in the energy sector or wi

We’re seeking an exceptional Principal Application SW Engineer to join our Japan‑based team within the Application Software team, focused on localising and advancing Wayve’s autonomous driving technology for the Japanese market. Our advanced AI software and foundation models enable vehicles to

Are you an experienced Principal Software Engineer looking to work on cutting-edge technology and make a meaningful impact on users' daily lives in the medical field? If so, we invite you to apply below. As the Principal Software Engineer, you'll bring a wealth of cloud-native expertise, taking on t

We are seeking a forward‑thinking Principal Software Engineer to join our dynamic AI Platform engineering team. As a Principal Software Engineer, you will be instrumental in creating state‑of‑the‑art tools and services that revolutionize the customer experience through advanced AI technologi

Principal Software Engineer – Go | Distributed Systems. They’re hiring a Principal Software Engineer to act as technical authority across a number of small product teams. They blend hardware, software and AI as a platform to increase efficiencies in an industry where time can truly save lives.

C&D Talent Advisory is looking for a Principal Software Engineer to innovate and build next-generation healthcare AI products. Candidates should have substantial backend engineering experience, predominantly in Python, and a strong background in system design.

As a Principal Engineer in the Boost team, you’ll be part of a group of principal engineers who champion technical excellence. Experience with AI‑powered feature development and leveraging AI tooling for software delivery, with enthusiasm for transforming how we build and deliver software. Techn

TwinThread is looking for a Principal Software Engineer to enhance and deliver market-leading technology products within an agile team. This role requires extensive experience in software engineering, particularly with cloud platforms like AWS, and proficiency in AI technologies.

Mentor engineers in architecture, systems thinking, and engineering best practices. Experience operating as a senior or principal engineer across multiple teams or domains. Backend engineering expertise with Java, Spring Boot, and microservices.

As a Principal Software Engineer - Engineering Manager at JPMorganChase within the Accelerator Business, you would be responsible for the vision for the Data and AI capabilities of the platform - to enable product teams to focus on their core problems and platform would cover the rest. Establish eng

This is a principal-level role for someone who has already operated at Staff or Principal Engineer level in a sizeable engineering organization and can point to specific platform decisions — in production today — that they own. Staff or Principal Engineer level in an organization of 100+ enginee

As a Principal Engineer, you will help shape the technical direction of platforms used by the global research community. Coach engineers and strengthen engineering practices such as observability, automation, and incident learning. Experience working at senior, staff, or principal engineer level acr

As a Principal Software Engineer within AI Governance Engineering, you will design and build platforms and shared services that enable teams to develop, deploy, and operate AI/ML solutions with compliance and governance seamlessly integrated. Professional software engineering experience with ownersh

I’m hiring multiple Principal Software Engineers for a Series A Scale Up in Central London that is moving quickly, building with AI as a real part of the product, and led by people who know how to scale. Interest in AI-enabled software development and modern engineering workflows. Strong experienc

Gemba Advantage is seeking a Senior/Principal Software Engineer to design and deliver secure, scalable software solutions while working in small agile teams. The role requires active SC or DV clearance and entails championing modern engineering practices, shaping architectural direction, and influen

Principal Software Engineer - Personalisation. Mentor and support senior engineers, helping to raise the overall engineering capability. Job Category Software Engineering.

Principal Software Engineer role within the Engineering - Server division at MariaDB plc. Principal Software Engineer - Distributed. This position is open for remote work in India, focusing on high-level software engineering contributions.

As a Principal Software Engineer, you will play a hands‑on technical leadership role across Appvia’s software engineering engagements, helping lead the design, delivery, and evolution of modern software systems. Principal Software Engineer - UK Security Clearance eligibility required. You will w

As a Staff+ Software Engineer at Seeq, you will play a critical role in shaping the technical direction and architecture of our software platform. A Bachelor's or Master's degree (or equivalent experience) in computer science, software engineering, or a related field. At least 10 years of profession

As a Principal Engineer, you will help teams do their best work by improving engineering practices, reducing delivery risk, and fostering a culture of trust, learning, and high standards. Works with Architects and other Principals to drive technical direction while partnering effectively with Engine

This growing team of experts in flight and aviation is building a new platform and seeks senior engineers to join them.

As a Principal Software Engineer, you will be responsible for:. Join our Compute division's Platform Engineering Team!. It is part of our larger Linux Engineering team, which provides the Linux kernel and operating system innovation for the Akamai global distributed network composed of 300,000+ serv

Principal Software Engineer - Engineering Manager to set the vision for the Data and AI platform.

Flawless AI, located in Greater London, is looking for exceptional Software Engineers to join our Product Engineering team. This role is flexible across levels, from Senior to Principal Engineer, depending on your experience. Successful candidates should have a strong foundation in software engineer

We’re looking for experienced Software Engineers to complete Coding tasks in a variety of Enterprise Languages.

Trust In SODA is seeking a Principal Software Engineer in Greater London to lead the development of a cloud security platform.

Morson Human Resources Limited is seeking a Principal Software Engineer for a retail company near Manchester undergoing a significant digital transformation.

PhysicsX in Greater London is looking for a Principal Software Engineer to lead a team in developing innovative software solutions.