1 to 25 of 320 Principal Engineer Jobs

Principal Engineer – Lead Tech Strategy for a Profitable FinTech Scale-Up Hybrid (London) or remote within the UK £160,000 per annum plus stock options Python | Django | FastAPI | AWS | Rust | Postgres | Event-Driven Architecture | Machine Learning Principal Engineer - We're working with a leading fintech scale-up that’s transforming how small businesses access finance. Backed … by a strong track record and an ambitious mission, they’re now looking for a Principal Engineer to lead the next phase of innovation within one of their most critical product areas. This is a strategic leadership role offering exceptional autonomy and influence. You’ll head up the evolution of a high-impact platform responsible for generating personalised … credit offers — a core driver of the business’s growth and customer experience. The Opportunity As Principal Engineer, you’ll take ownership of the technical strategy and architecture for dynamic, data-driven systems that determine the financial products offered to new customers. This is a unique chance to define the future of adaptive credit systems, driving smarter, faster More ❯

Principal Engineer – Lead Tech Strategy for a Profitable FinTech Scale-Up Hybrid (London) or remote within the UK £160,000 per annum plus stock options Python | Django | FastAPI | AWS | Rust | Postgres | Event-Driven Architecture | Machine Learning Principal Engineer - We're working with a leading fintech scale-up that’s transforming how small businesses access finance. Backed … by a strong track record and an ambitious mission, they’re now looking for a Principal Engineer to lead the next phase of innovation within one of their most critical product areas. This is a strategic leadership role offering exceptional autonomy and influence. You’ll head up the evolution of a high-impact platform responsible for generating personalised … credit offers — a core driver of the business’s growth and customer experience. The Opportunity As Principal Engineer, you’ll take ownership of the technical strategy and architecture for dynamic, data-driven systems that determine the financial products offered to new customers. This is a unique chance to define the future of adaptive credit systems, driving smarter, faster More ❯

Principal Engineer – Lead Tech Strategy for a Profitable FinTech Scale-Up Hybrid (London) or remote within the UK £160,000 per annum plus stock options Python | Django | FastAPI | AWS | Rust | Postgres | Event-Driven Architecture | Machine Learning Principal Engineer - We're working with a leading fintech scale-up that’s transforming how small businesses access finance. Backed … by a strong track record and an ambitious mission, they’re now looking for a Principal Engineer to lead the next phase of innovation within one of their most critical product areas. This is a strategic leadership role offering exceptional autonomy and influence. You’ll head up the evolution of a high-impact platform responsible for generating personalised … credit offers — a core driver of the business’s growth and customer experience. The Opportunity As Principal Engineer, you’ll take ownership of the technical strategy and architecture for dynamic, data-driven systems that determine the financial products offered to new customers. This is a unique chance to define the future of adaptive credit systems, driving smarter, faster More ❯

Principal Engineer – Lead Tech Strategy for a Profitable FinTech Scale-Up Hybrid (London) or remote within the UK £160,000 per annum plus stock options Python | Django | FastAPI | AWS | Rust | Postgres | Event-Driven Architecture | Machine Learning Principal Engineer - We're working with a leading fintech scale-up that’s transforming how small businesses access finance. Backed … by a strong track record and an ambitious mission, they’re now looking for a Principal Engineer to lead the next phase of innovation within one of their most critical product areas. This is a strategic leadership role offering exceptional autonomy and influence. You’ll head up the evolution of a high-impact platform responsible for generating personalised … credit offers — a core driver of the business’s growth and customer experience. The Opportunity As Principal Engineer, you’ll take ownership of the technical strategy and architecture for dynamic, data-driven systems that determine the financial products offered to new customers. This is a unique chance to define the future of adaptive credit systems, driving smarter, faster More ❯

Principal Engineer – Lead Tech Strategy for a Profitable FinTech Scale-Up Hybrid (London) or remote within the UK £160,000 per annum plus stock options Python | Django | FastAPI | AWS | Rust | Postgres | Event-Driven Architecture | Machine Learning Principal Engineer - We're working with a leading fintech scale-up that’s transforming how small businesses access finance. Backed … by a strong track record and an ambitious mission, they’re now looking for a Principal Engineer to lead the next phase of innovation within one of their most critical product areas. This is a strategic leadership role offering exceptional autonomy and influence. You’ll head up the evolution of a high-impact platform responsible for generating personalised … credit offers — a core driver of the business’s growth and customer experience. The Opportunity As Principal Engineer, you’ll take ownership of the technical strategy and architecture for dynamic, data-driven systems that determine the financial products offered to new customers. This is a unique chance to define the future of adaptive credit systems, driving smarter, faster More ❯

Principal Engineer London Hybrid £100,000-£170,000 + bonus + benefits We’re working with a rapidly growing tech for good company that is transforming how data, automation, and smart integrations shape the future of digital infrastructure. Their platform optimises real-time operations, connecting users with seamless, intelligent technology solutions. We are looking for Principal Engineer … their high performance systems. This is an opportunity to work with modern backend architecture, collaborating with top-tier engineers in a fast-moving, product-focused environment. Responsibilities as a Principal Engineer: Contribute to the businesses technology strategy and architecture Contribute to the backend Kotlin infrastructure Ship resilient and well tested production code Collaborate with different teams to deliver … and bonus Hybrid office/remote-working practices Private Health Insurance Pension Scheme Life Assurance Scheme with death in service benefit of 4x salary This is a career defining Principal Engineer position with the potential to have a massive impact on the technology strategy of a business that is directly shaping the future of intelligent digital infrastructure. **Unfortunately More ❯

Principal Engineer London Hybrid £100,000-£170,000 + bonus + benefits We’re working with a rapidly growing tech for good company that is transforming how data, automation, and smart integrations shape the future of digital infrastructure. Their platform optimises real-time operations, connecting users with seamless, intelligent technology solutions. We are looking for Principal Engineer … their high performance systems. This is an opportunity to work with modern backend architecture, collaborating with top-tier engineers in a fast-moving, product-focused environment. Responsibilities as a Principal Engineer: Contribute to the businesses technology strategy and architecture Contribute to the backend Kotlin infrastructure Ship resilient and well tested production code Collaborate with different teams to deliver … and bonus Hybrid office/remote-working practices Private Health Insurance Pension Scheme Life Assurance Scheme with death in service benefit of 4x salary This is a career defining Principal Engineer position with the potential to have a massive impact on the technology strategy of a business that is directly shaping the future of intelligent digital infrastructure. **Unfortunately More ❯

Principal Engineer London Hybrid £100,000-£170,000 + bonus + benefits We’re working with a rapidly growing tech for good company that is transforming how data, automation, and smart integrations shape the future of digital infrastructure. Their platform optimises real-time operations, connecting users with seamless, intelligent technology solutions. We are looking for Principal Engineer … their high performance systems. This is an opportunity to work with modern backend architecture, collaborating with top-tier engineers in a fast-moving, product-focused environment. Responsibilities as a Principal Engineer: Contribute to the businesses technology strategy and architecture Contribute to the backend Kotlin infrastructure Ship resilient and well tested production code Collaborate with different teams to deliver … and bonus Hybrid office/remote-working practices Private Health Insurance Pension Scheme Life Assurance Scheme with death in service benefit of 4x salary This is a career defining Principal Engineer position with the potential to have a massive impact on the technology strategy of a business that is directly shaping the future of intelligent digital infrastructure. **Unfortunately More ❯

Principal Engineer London Hybrid £100,000-£170,000 + bonus + benefits We’re working with a rapidly growing tech for good company that is transforming how data, automation, and smart integrations shape the future of digital infrastructure. Their platform optimises real-time operations, connecting users with seamless, intelligent technology solutions. We are looking for Principal Engineer … their high performance systems. This is an opportunity to work with modern backend architecture, collaborating with top-tier engineers in a fast-moving, product-focused environment. Responsibilities as a Principal Engineer: Contribute to the businesses technology strategy and architecture Contribute to the backend Kotlin infrastructure Ship resilient and well tested production code Collaborate with different teams to deliver … and bonus Hybrid office/remote-working practices Private Health Insurance Pension Scheme Life Assurance Scheme with death in service benefit of 4x salary This is a career defining Principal Engineer position with the potential to have a massive impact on the technology strategy of a business that is directly shaping the future of intelligent digital infrastructure. **Unfortunately More ❯

Principal Engineer London Hybrid £100,000-£170,000 + bonus + benefits We’re working with a rapidly growing tech for good company that is transforming how data, automation, and smart integrations shape the future of digital infrastructure. Their platform optimises real-time operations, connecting users with seamless, intelligent technology solutions. We are looking for Principal Engineer … their high performance systems. This is an opportunity to work with modern backend architecture, collaborating with top-tier engineers in a fast-moving, product-focused environment. Responsibilities as a Principal Engineer: Contribute to the businesses technology strategy and architecture Contribute to the backend Kotlin infrastructure Ship resilient and well tested production code Collaborate with different teams to deliver … and bonus Hybrid office/remote-working practices Private Health Insurance Pension Scheme Life Assurance Scheme with death in service benefit of 4x salary This is a career defining Principal Engineer position with the potential to have a massive impact on the technology strategy of a business that is directly shaping the future of intelligent digital infrastructure. **Unfortunately More ❯

opportunities for all. We benefit from diversity. That said, we're far from perfect - we want to be more diverse and representative. Join us and help make that happen. Principal Software Engineer - £Excellent London Principal Software Engineer Principal Software Engineer The role We're looking for a Principal Software Engineer to join … our digital product delivery function. Red Badger delivers high quality digital products using a lean delivery process and multidisciplinary, cross-functional teams. The Principal Software Engineer is a senior technical leader with deep expertise in building and operating digital products, particularly within complex client environments and multi-team projects. This role is instrumental in shaping the technical direction … of client engagements and plays a key part in delivering high-quality outcomes through strategic influence, hands-on support, and deep domain knowledge. You will collaborate closely with Principal Product and Delivery roles, as well as Technical and Delivery Leads, to ensure that technology choices align with both client goals and Red Badger's value propositions. You will engage More ❯

Job Description - Principal Engineer - Cyber Security () Principal Engineer - Cyber Security - Job Title: Principal Engineer - Cyber Security Location: Frimley, Bristol, Weymouth, Portsmouth, Coventry. We offer a range of hybrid and flexible working arrangements - please speak to your recruiter about the options for this particular role. Salary: Up to £61,500 depending on skills and experience More ❯

great opportunity for professional growth. Find your future with us. The Government Training Engineering (GTE) F-22 Engineering Integration & Systems Team is seeking a highly motivated and experienced Systems Engineer to serve in the role of F-22 Pilot Training Principal Engineer in Berkeley, MO . The selected individual will be the primary technical point of contact … for both external and internal customer interface and coordination activities to ensure program expectations are met. The F-22 Pilot Training Principal Engineer will have the opportunity to interact with United States Air Force (USAF) Program Office, Air Combat Command (ACC), Pilot Training Instructors, and Pilots of the nation's premier 5th gen air dominance fighter, the F … AT) Cockpit and Forward Fuselage Trainer (CFFT) Fuel System Trainer (FST) Landing Gear Trainer (LGT) Seat and Canopy Trainer (SCT) On-Equipment Structures Trainer The F-22 Pilot Training Principal Engineer will oversee all Trainer proposal, development, integration, delivery, and sustainment activities for Mission Training Centers (MTC) located at the main operating bases for the F-22 Raptor. More ❯

for all. We benefit from diversity. That said, we're far from perfect - we want to be more diverse and representative. Join us and help make that happen. Freelance Principal DevOps Engineer - £day rate (outside IR35) London Principal DevOps Engineer Join a new discovery/greenfield project Project is to build a new payments platform for … of working Experience with multiple programming languages, in web and/or mobile and multiple paradigms (e.g. declarative, functional, object oriented ) Duration 6 months (Likely to extend) Immediate Interviews Principal Software Engineer The role We're looking for a Principal Software Engineer to join our digital product delivery function. Red Badger delivers high quality digital products … using a lean delivery process and multidisciplinary, cross-functional teams. The Principal Software Engineer is a senior technical leader with deep expertise in building and operating digital products, particularly within complex client environments and multi-team projects. This role is instrumental in shaping the technical direction of client engagements and plays a key part in delivering high-quality More ❯

Principal Engineer - Product Security (Product Security Analyst) - 6 month contract - Frimley, Surrey - £85.40 ph UMB or £63.21 ph PAYE (Inside IR35) The Umbrella rate quoted above is the Gross Umbrella rate (i.e. the rate we pay to the Umbrella Company inclusive of ALL employment costs). Please note, the rate paid by the Umbrella will be less, as … will a Limited Deemed rate or Agency PAYE rate. Please get in touch to discuss the rates via these different payment vehicles. The Role The PSA Principal Engineer will be a focal point for security and information risk matters within the Product Security Engineering (PSyE) team and will be able to apply their deep level of subject matter … such as Training Needs Analysis (TNA), Technical Publications, Cyber Incident Plans and Operating Instructions (list is not exhaustive). What are BAE Systems looking for from you? The PSA Principal Engineer will have a good understanding of the applicable regulations, standards, policies and guidance on information risk management, to be able to identify, analyse and evaluate information risks. More ❯

Principal Engineer – Electrical or Mechanical – Data Centres and Missions Critical UK-Wide – (London, Manchester, Birmingham, Newcastle, Glasgow, Cardiff and Bristol) We are a specialist recruitment agency partnering with a prestigious UK-based consultancy renowned for delivering large-scale, mission-critical data centre projects across the UK and Europe. As their project portfolio grows, we are seeking an experienced … Principal Engineer with strong leadership skills in either Electrical or Mechanical disciplines. This is an exceptional opportunity to lead at a strategic level, shaping the delivery of world-class hyperscale, colocation, and bespoke data centre solutions. We want to hear from Principal-level Electrical or Mechanical Engineers with extensive experience driving multi-disciplinary design teams and complex … sharing within the engineering teams Requirements Degree-qualified in Electrical or Mechanical Engineering (or Building Services) 12+ years’ progressive experience in engineering with at least 5 years in a principal or senior leadership role Proven track record of delivering complex hyperscale, colocation, or mission-critical data centre projects across UK and Europe Deep technical expertise in your core discipline More ❯

Principal Engineer Azure & IaC (Terraform, Pulumi) 90,000 95,000 Base Salary. Excellent Company Benefits (including paid technical training). Hybrid or Fully Remote Option Offices in England, Scotland & USA. On-Call Rota 1 week in 3 months. Paid travel to HQ for Product & Engineering meetups (1-2 times per month). Areti are delighted to be partnering … with one of the UKs fastest-growing SaaS businesses in the search for a Principal Engineer with Infrastructure-as-Code experience (Terraform, Pulumi) . This award-winning organisation has achieved over 40% growth in 2025 , expanding rapidly across the UK and North America . With a major multi-million-pound technology investment planned for the year ahead, this … is a rare opportunity to play a pivotal leadership role in shaping a modern, greenfield-style environment that underpins their continued success. The Role As a Principal Engineer , youll take a hands-on and strategic role within the engineering organisation, driving reliability, scalability, and performance across mission-critical systems. Youll guide and mentor platform, SRE, and DevOps teams More ❯

Principal Engineer – Azure & IaC (Terraform, Pulumi) £90,000 – £95,000 Base Salary. Excellent Company Benefits (including paid technical training). Hybrid or Fully Remote Option – Offices in England, Scotland & USA. On-Call Rota – 1 week in 3 months. Paid travel to HQ for Product & Engineering meetups (1-2 times per month). Areti are delighted to be partnering … with one of the UK’s fastest-growing SaaS businesses in the search for a Principal Engineer with Infrastructure-as-Code experience (Terraform, Pulumi) . This award-winning organisation has achieved over 40% growth in 2025 , expanding rapidly across the UK and North America . With a major multi-million-pound technology investment planned for the year ahead … this is a rare opportunity to play a pivotal leadership role in shaping a modern, greenfield-style environment that underpins their continued success. The Role As a Principal Engineer , you’ll take a hands-on and strategic role within the engineering organisation, driving reliability, scalability, and performance across mission-critical systems. You’ll guide and mentor platform, SRE More ❯

to do what others think is impossible. Our employees are not only part of history, they're making history. Northrop Grumman Space Systems in Linthicum, MD is seeking a Principal or Senior Principal Systems Engineer to join our Payload Systems Engineering Team as an Interfaces Lead . As a member of this team, you will have the … wide variety of expertise within the systems engineering domain. This includes mission engineering, requirements, architecture, modeling and simulation, integration and test, and verification and validation. As the Interfaces Lead Engineer , you will be responsible for the negotiation and documentation of Payload Internal and External interfaces. This role may include, but is not limited to, the following: Ability to work … not prevent meeting, payload level requirements Ensuring that all interfaces are well defined and contain all necessary attributes in the Cameo model This position can be staffed at a Principal or Sr. Principal level , based on the basic qualifications below. In addition, this position can be based in Linthicum, MD or Rolling Meadows, IL. The basic qualifications you More ❯

to do what others think is impossible. Our employees are not only part of history, they're making history. Northrop Grumman Space Systems in Linthicum, MD is seeking a Principal or Senior Principal Systems Engineer to join our Payload Systems Engineering Team as an Interfaces Lead . As a member of this team, you will have the … wide variety of expertise within the systems engineering domain. This includes mission engineering, requirements, architecture, modeling and simulation, integration and test, and verification and validation. As the Interfaces Lead Engineer , you will be responsible for the negotiation and documentation of Payload Internal and External interfaces. This role may include, but is not limited to, the following: Ability to work … not prevent meeting, payload level requirements Ensuring that all interfaces are well defined and contain all necessary attributes in the Cameo model This position can be staffed at a Principal or Sr. Principal level , based on the basic qualifications below. In addition, this position can be based in Linthicum, MD or Rolling Meadows, IL. The basic qualifications you More ❯

to do what others think is impossible. Our employees are not only part of history, they're making history. Northrop Grumman Space Systems in Linthicum, MD is seeking a Principal or Senior Principal Systems Engineer to join our Payload Systems Engineering Team as an Interfaces Lead . As a member of this team, you will have the … wide variety of expertise within the systems engineering domain. This includes mission engineering, requirements, architecture, modeling and simulation, integration and test, and verification and validation. As the Interfaces Lead Engineer , you will be responsible for the negotiation and documentation of Payload Internal and External interfaces. This role may include, but is not limited to, the following: Ability to work … not prevent meeting, payload level requirements Ensuring that all interfaces are well defined and contain all necessary attributes in the Cameo model This position can be staffed at a Principal or Sr. Principal level , based on the basic qualifications below. In addition, this position can be based in Linthicum, MD or Rolling Meadows, IL. The basic qualifications you More ❯

to do what others think is impossible. Our employees are not only part of history, they're making history. Northrop Grumman Space Systems in Linthicum, MD is seeking a Principal or Senior Principal Systems Engineer to join our Payload Systems Engineering Team as an Interfaces Lead . As a member of this team, you will have the … wide variety of expertise within the systems engineering domain. This includes mission engineering, requirements, architecture, modeling and simulation, integration and test, and verification and validation. As the Interfaces Lead Engineer , you will be responsible for the negotiation and documentation of Payload Internal and External interfaces. This role may include, but is not limited to, the following: Ability to work … not prevent meeting, payload level requirements Ensuring that all interfaces are well defined and contain all necessary attributes in the Cameo model This position can be staffed at a Principal or Sr. Principal level , based on the basic qualifications below. In addition, this position can be based in Linthicum, MD or Rolling Meadows, IL. The basic qualifications you More ❯

to do what others think is impossible. Our employees are not only part of history, they're making history. Northrop Grumman Space Systems in Linthicum, MD is seeking a Principal or Senior Principal Systems Engineer to join our Payload Systems Engineering Team as an Interfaces Lead . As a member of this team, you will have the … wide variety of expertise within the systems engineering domain. This includes mission engineering, requirements, architecture, modeling and simulation, integration and test, and verification and validation. As the Interfaces Lead Engineer , you will be responsible for the negotiation and documentation of Payload Internal and External interfaces. This role may include, but is not limited to, the following: Ability to work … not prevent meeting, payload level requirements Ensuring that all interfaces are well defined and contain all necessary attributes in the Cameo model This position can be staffed at a Principal or Sr. Principal level , based on the basic qualifications below. In addition, this position can be based in Linthicum, MD or Rolling Meadows, IL. The basic qualifications you More ❯

to do what others think is impossible. Our employees are not only part of history, they're making history. Northrop Grumman Space Systems in Linthicum, MD is seeking a Principal or Senior Principal Systems Engineer to join our Payload Systems Engineering Team as an Interfaces Lead . As a member of this team, you will have the … wide variety of expertise within the systems engineering domain. This includes mission engineering, requirements, architecture, modeling and simulation, integration and test, and verification and validation. As the Interfaces Lead Engineer , you will be responsible for the negotiation and documentation of Payload Internal and External interfaces. This role may include, but is not limited to, the following: Ability to work … not prevent meeting, payload level requirements Ensuring that all interfaces are well defined and contain all necessary attributes in the Cameo model This position can be staffed at a Principal or Sr. Principal level , based on the basic qualifications below. In addition, this position can be based in Linthicum, MD or Rolling Meadows, IL. The basic qualifications you More ❯

to do what others think is impossible. Our employees are not only part of history, they're making history. Northrop Grumman Space Systems in Linthicum, MD is seeking a Principal or Senior Principal Systems Engineer to join our Payload Systems Engineering Team as an Interfaces Lead . As a member of this team, you will have the … wide variety of expertise within the systems engineering domain. This includes mission engineering, requirements, architecture, modeling and simulation, integration and test, and verification and validation. As the Interfaces Lead Engineer , you will be responsible for the negotiation and documentation of Payload Internal and External interfaces. This role may include, but is not limited to, the following: Ability to work … not prevent meeting, payload level requirements Ensuring that all interfaces are well defined and contain all necessary attributes in the Cameo model This position can be staffed at a Principal or Sr. Principal level , based on the basic qualifications below. In addition, this position can be based in Linthicum, MD or Rolling Meadows, IL. The basic qualifications you More ❯