# Principal Engineer Remote from[UK](https://jobicy.com/job-region/uk.md)Annual salary Undisclosed Salary information is not provided for this position. Check our [Salary Directory](https://jobicy.com/salaries.md) to estimate the average compensation for similar roles.Department [Software Engineering](https://jobicy.com/categories/engineering.md) Employment type Full Time, Job posted25 Jun 2026Apply before25 Jul 2026Experience level Senior Views / Applies 305 / 70 [About company](https://jobicy.com/company/masabi.md) [Share](#share) About [Masabi](https://jobicy.com/company/masabi.md) Fare Payments for Public Transport Made Simple * [Computer Software](https://jobicy.com/company-category/software.md) * 2012 Verified job posting This job post has been [manually reviewed](https://jobicy.com/tools/help-center/employee/how-does-jobicy-verify-the-legitimacy-of-remote-job-listings.md) for authenticity and compliance. Tailor Resume Check Job Fit Cover Letter ### Tailor my resume to this job Discover how to best rewrite and optimize your resume for this specific job. You'll receive personalized suggestions and detailed guidance to highlight your key strengths, effectively address the job requirements, and make your application more compelling to recruiters and hiring managers. After analyzing your resume, I can provide several recommendations to better position yourself for this role. Your background in software development shows strong technical skills, particularly in Java and Python development. However, for this Senior Backend Developer position, I notice there could be more emphasis on your experience with microservices architecture and cloud technologies, which are key requirements for this role. I recommend highlighting specific projects where you utilized these technologies and quantifying your achievements to demonstrate impact... Upgrade to Plus ### Am I a good fit for this job? 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Upgrade to Plus ### AI Summary Masabi is seeking a Principal Engineer to join its Architecture team, driving the technical direction of the Justride fare payment platform used globally. This senior role combines deep technical expertise with strong judgment, requiring hands-on contributions in code, design, and architecture. The ideal candidate has experience shaping distributed systems and microservices, working with AWS, and tackling scalability and performance challenges. They will act as a technical advisor across teams, define platform blueprints, and produce clear documentation. The position offers an opportunity to influence a platform serving millions of users worldwide. ### Role DNA Job Complexity Easy Hard AI Insight This is a senior leadership role requiring deep expertise in distributed systems, cloud architecture, and cross-team collaboration, along with hands-on technical skills and the ability to navigate ambiguity. The combination of technical depth, strategic influence, and industry experience makes it highly challenging. ### Salary Analysis Median Market Rate $230,000US Market $180k – 300k 0 $330k AI Insight No salary was provided in the listing. Based on market data for a Principal Engineer in the US (especially with AWS and distributed systems expertise), the median salary is estimated at $230,000. This role typically commands top-tier compensation due to its seniority and impact. ### Core Skills Required [Distributed Systems](https://jobicy.com/jobs?search_keywords=Distributed+Systems.md) [Microservices Architecture](https://jobicy.com/jobs?search_keywords=Microservices+Architecture.md) [AWS](https://jobicy.com/jobs?search_keywords=AWS.md) [Platform Architecture](https://jobicy.com/jobs?search_keywords=Platform+Architecture.md) [Technical Leadership](https://jobicy.com/jobs?search_keywords=Technical+Leadership.md) [Scalability](https://jobicy.com/jobs?search_keywords=Scalability.md) [Performance Optimization](https://jobicy.com/jobs?search_keywords=Performance+Optimization.md) [REST API Design](https://jobicy.com/jobs?search_keywords=REST+API+Design.md) [Data Architecture](https://jobicy.com/jobs?search_keywords=Data+Architecture.md) [Software Engineering](https://jobicy.com/jobs?search_keywords=Software+Engineering.md) ### Cover Letter Sample I am excited to apply for the Principal Engineer role at Masabi. With over 10 years of experience designing and evolving distributed systems and microservices architectures, I have a strong track record of shaping technical direction across multiple teams. My hands-on expertise with AWS and modern infrastructure practices aligns perfectly with Masabi's platform needs. I have successfully led architecture initiatives that improved scalability, reliability, and cost efficiency, and I am comfortable navigating ambiguity to turn complex problems into clear technical approaches. I am particularly drawn to Masabi's mission of driving the fare payment revolution and would welcome the opportunity to contribute to a platform used by millions globally. I look forward to the possibility of discussing how my experience can support Masabi's technical vision. Copy ### Sample Interview Questions Describe a time when you had to make a significant architectural decision that involved trade-offs between scalability, cost, and performance. How did you approach it?At my previous company, we were migrating a monolithic service to microservices. We had to choose between using AWS Lambda for cost efficiency and EC2 for better performance. I led a proof-of-concept comparing both options under realistic load, factoring in cold start latency and throughput. We ultimately chose a hybrid approach: Lambda for bursty, low-latency endpoints and EC2 for high-throughput, steady-state services. This balanced cost and performance while meeting SLAs.How do you stay hands-on while also providing technical leadership across multiple teams?I allocate a portion of my time each week to direct code contributions, often tackling complex or cross-cutting issues that unblock teams. I also participate in design reviews and pair programming sessions. By staying close to the implementation, I ensure my architectural guidance is grounded in practical realities. Additionally, I mentor senior engineers to amplify my impact.Can you walk me through how you would design a scalable and resilient fare collection platform that handles millions of transactions per day?I would start by defining clear service boundaries, using an event-driven architecture with message queues for asynchronous processing. The system would be stateless where possible, using AWS services like DynamoDB for high-throughput data and SQS for decoupling. For resilience, I'd implement circuit breakers, retries with exponential backoff, and multi-AZ deployment. I'd also design for eventual consistency where appropriate, using idempotency keys for critical operations.How do you approach defining and evolving architecture standards across an engineering organization?I believe in collaborative governance. I would establish an architecture forum with representatives from each team to discuss and propose standards. For each standard, we'd document the rationale, trade-offs, and examples. I'd also create a lightweight review process for new services or major changes to ensure alignment. To keep standards evolving, we'd hold regular retrospectives and update them based on lessons learned.Describe a complex problem you encountered with data architecture (e.g., data pipelines, warehousing) and how you solved it.At a previous role, we had a data pipeline that was failing to meet latency requirements due to a bottleneck in the ETL process. The pipeline ingested real-time events and needed to update a data warehouse for analytics. I redesigned the pipeline to use Apache Kafka for streaming and implemented a lambda architecture with both batch and stream processing. This reduced latency from hours to seconds and improved data freshness for business decisions. About Us_ // At Masabi, we’re driving the fare payment revolution, powering the journeys of millions all over the world. We build fare collection platforms that allow riders to seamlessly buy and present tickets for public transport either on their mobile phones, from a ticket machine, or even by tapping their bank card to travel. Our Justride platform is used in over 250 locations globally, including some of the largest cities in the world. With our industry-first mobile ticketing SDK, we’ve partnered with large players in the transport space, including Uber, Moovit and Transit. Your own journey is important to us too. Choosing a role here means joining a network of innovators from all walks of life; a group of passionate individuals who consistently deliver. Here, you’ll find the tools you need to build the career you want. Whether you’re taking the direct route or trying a new path, we’ll support you no matter what. ## The Role_ // We’re looking for a Principal Engineer to join Masabi’s Architecture team. This is a senior role for someone who combines deep technical expertise with strong judgement and the ability to operate across teams. You’ll help shape the technical direction of Masabi’s platform while staying close enough to the detail to design, review and deliver meaningful technical work. Working across the engineering organisation, you’ll act as a senior technical leader: defining and evolving architecture, guiding complex decisions, and contributing hands-on where it matters most. The role suits someone who can move between system-level thinking and implementation, someone who understands trade-offs, can navigate ambiguity, and helps turn complex or loosely defined problems into clear, practical technical approaches. ## Responsibilities_ * Shape Masabi’s platform architecture, including platform blueprint definition, standards and best practices * Design and deliver scalable, robust, cost efficient services aligned with platform blueprint * Stay hands-on in code and technical delivery, including reviews and targeted contributions * Identify and work through complex platform challenges related to scalability, performance, resilience and cost * Act as a senior technical advisor across engineering teams, supporting and influencing technical decisions and ensuring Masabi standards are followed * Shape and contribute to technical roadmap planning and prioritisation of platform improvements * Support RFP estimation and technical scoping for complex initiatives * Produce clear, high-quality technical documentation and architecture artefacts * Improve how architecture is understood and applied across engineering and the wider business * Contribute to and help shape technical forums and working groups, including areas such as API and architecture governance ## About You_ * You bring strong experience designing and evolving distributed systems and microservices architectures * You’ve operated at Principal or Staff level, shaping technical direction across multiple teams or domains * You are comfortable staying hands-on, contributing in code, design and delivery when needed * You have strong experience with cloud platforms (AWS preferred) and modern infrastructure practices * You’ve worked on systems where scale, reliability, performance and cost trade-offs matter, and can navigate those decisions thoughtfully * You have proven experience in data architecture (e.g. data platforms, pipelines, warehousing or data lakes) * You can take loosely defined (early stage) business or technical problems and turn them into clear, actionable technical approaches * You communicate complex ideas clearly and effectively, and produce structured documentation that helps both technical and non-technical audiences make decisions * You’ve contributed to engineering standards, architecture patterns or platform direction * Interest in or exposure to AI-enabled systems, particularly understanding architectural implications in production ## Nice To Have_ * Experience with REST API design in complex, multi-service environments * Experience breaking monolithic applications into microservices architectures * Experience with event-driven architectures (e.g. Kafka, schema governance) * Experience improving cloud cost and system efficiency at scale * Familiarity with a range of tools and technologies including: Development: Kotlin, Java * Data storage: DynamoDB, MySQL * Infrastructure as code and CI/CD: Terraform, GitLab CI/CD // You don’t need to have experience in every area listed above. If you bring strong fundamentals, good judgement and a willingness to learn, we’d still love to hear from you. ## Some of Our Benefits_ * 25 days of holiday per year plus the option to buy another 5 days pro-rated * Private Healthcare via AXA, including pre-existing conditions and mental health * Life Insurance * Menopause support * Choice of workstation * Ability to work for up to 3 months per year from any country in the world (certain limitations) * Pension scheme * Training allowance of up to £1000 per year * £200 annual allowance for any home office need or improvement * Enhanced family leave pay * Cycle to work scheme * Regular social gatherings with a monthly allowance for each employee * Fun and collaborative environment with a focus on making a difference in the world Careers at Masabi are for people going places – driven by a mission to make transit fair and accessible for all. // We are a network of innovators from all walks of life, passionate about making a difference. At Masabi, we operate with openness and trust, creating an environment where everyone feels empowered to bring their whole, authentic selves to work. Whoever you are, just be yourself. // We welcome applications from underrepresented groups, including disabled and neurodivergent people, and can make adjustments at any stage of the process. You’re also welcome to share your pronouns whenever you feel comfortable. Together, we simplify journeys, remove barriers, and improve daily life for millions. Why Join Masabi? * Driven by Purpose – We believe in journeys made simple. The work isn’t always easy, but the best things never are. * Encouraged to Accelerate – Masabi is going places and our people are in the driving seat. Whether you’re taking the direct route or exploring new paths, we support your journey. * Advancing with Empathy – We put people first and foster a culture of learning, not blame. No matter your cargo, we share the load. We’re already powering journeys – are you ready to join us? Show more [Apply now >](https://jobicy.com/jobs/143481-principal-engineer.md) > Annual salary information is not provided for this position. 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