• Based in CET, Eastern US, or Middle East time zones, with the ability to maintain a 70% schedule overlap with the team’s core working hours of 10 AM to 5 PM CET. • Define and document technical and architectural visions for products, components, and libraries. • Ensure recommended software engineering principles are followed across all projects. • Design solutions that satisfy business, functional, and non-functional requirements, distinguishing features from enablers. • Define subsystems and their interfaces while allocating clear responsibilities across the architecture. • Establish critical non-functional requirements and raise awareness of these needs among stakeholders. • Document all architecture and technical decisions in a centralized, accessible location. • Evaluate and select appropriate software, hardware, and integration methods, ensuring products do not rely on unstable or immature external libraries. • Factor the long-term costs of architectural decisions into the overall decision-making process. • Support agile software development practices and participate in planning, solution definition, and exploration of alternatives. • Provide technical advice during work prioritization and iteration planning. • Contribute to work breakdown and task allocation to maximize team effectiveness. • Review acceptance criteria for critical developer tasks. • Communicate technical details clearly with scientists, researchers, developers, and business stakeholders. • Summarize proposed technical solutions for management and business decision-makers. • Enable continuous delivery of features through appropriate architectural planning, timeline setting, and milestone definition. • Acquire a deep technical understanding of the specific problem and solution spaces. • Maintain updated expertise in computer science and engineering techniques. • Review relevant literature and learn new topics as necessary to solve complex technical problems. • Recognize the limits of personal expertise and seek additional knowledge or external input when required.

Who We Are WhereTo is a business travel startup from San Francisco that evolved into an agile development and design studio within the Flight Centre family. We build travel solutions used by some of the largest companies on the planet - we have just one goal: making business travel better for everybody. WhereTo provides an AI-powered travel platform for corporate travel. Our platform uses machine learning algorithms to recommend personalized travel options based on a traveller's preferences, company policies, and budget. Our technology also allows for real-time travel tracking, reporting, and cost analysis, enabling companies to optimize their travel programs and reduce costs. Role Summary We are looking for a Back End focused engineer to be a pivotal member of our engineering team. You will be working closely with product managers and developers who like to use lots of interesting technologies to develop core features used across the WhereTo platform. A great fit for this role is someone who is always intrigued by new technology, is constantly finding better ways to write beautiful, shareable, scalable and solid code, is comfortable working in a fast paced remote environment, and is a team player. What You'll Do - Responsible for creating high quality user-focused software while working in a fast-moving domain team. - Help define, implement and reinforce architectural + implementation best practices - Assist Team Lead in facilitating technical planning for team’s projects. - Assist Team Lead in communicating progress, roadblocks, concerns, and - successes to engineering management. - May be required to organize and lead meetings with external stakeholders as needed. - Provide technical guidance to more junior engineers - Assist Team Lead in code review for your team. - Help your team members debug issues and solve complex tasks. - Provide mentorship to junior engineers. - Assist in onboarding process for your team. - You will live and breathe asynchronous I/O, Typed JavaScript and horizontal scalability. - Help cultivate a safe, inclusive, and accessible work environment for team members of all backgrounds including people who are racialized, have disabilities (invisible or visible), require faith accommodations, and/or are LGBTQ2+ - Help to foster an inclusive and accessible team environment for all Flighties, regardless of their identities and cultural backgrounds What We're Looking For - More than 6+ years experience in a software development role - Experience with building and architecting high quality software from scratch - Strong Node.js and JavaScript skills (ES6, Babel) - experience with TypeScript and/or FlowType is a bonus - Strong understanding of asynchronous I/O - Excellent software architecture skills and a passion for maintainable, organized code - Experienced with AWS, EC3, S3, RDS, CloudFront/CDNs - Expert with Linux, Ubuntu/Debian (BASH scripting a plus) - Experience with CI platforms (Jenkins, CircleCI, Travis, etc) - Experience with REST-based Web Service API implementation - Experience with MySQL/PostgreSQL (or similar) and understanding of how they work internally - Experience with Algorithms and Data Structures - Experience with NoSQL databases is desirable (i.e MongoDB, Cassandra) - Experience with memory cache systems (Redis, Memcached) - Experience with other systems programming languages is a bonus (Go, C/C++, - Rust, etc), and/or scripting languages (Python) and/or JVM-based languages (Scala, Java, Groovy) - Experience with pure functional programming and/or functional programming - libraries and concepts is a bonus (Haskell, Scala, F#, Ramda, Lo-Dash FP etc) - Strong experience in designing and implementing highly horizontally-scalable architecture What You'll Enjoy - Tick destinations off your bucket list with our discounts on travel and accommodation. - Enjoy 25 Days Off per year plus 5 Compensation days! - Learn a new language with our free language learning platform (Global Exam). - Employee Retention Share Scheme through Equate Plus. - Various social events to promote networking, the celebration of wins, and sometimes just for fun! (Global Gathering 2024 - Portugal). - Enjoy our discounts with GymApp. - Complementary coffee, drinks, snacks and fruits at our Barcelona office location. - A strong focus on professional development to support you in the evolution of your career. #L-CS2#WTO#LI-Remote My share code is: WE8 L57 7HZ

• Lead the technical direction for Gatekeeper as the unified entry point for Helius traffic, with an emphasis on p50/p99 latency and tail reliability. • Design and implement routing and load balancing strategies across regions and backend pools, including failover behavior and graceful degradation. • Improve connection handling end-to-end: TLS termination, keepalives, pooling, timeouts, backpressure, and request/response streaming behavior. • Build robust, operator-friendly observability: SLOs, dashboards, alerts, and “is it healthy?” views that make issues diagnosable fast. • Partner with internal service teams to define and enforce contracts (timeouts, retries, error mapping, capacity signals), and reduce systemic failure modes. • Drive hardening work across security and abuse controls (auth failure behavior, rate limiting / caps enforcement, request validation). • Own production operations for Gatekeeper: incident response, on-call improvements, runbooks, and post-incident follow-through. • Mentor engineers and raise the bar on performance engineering, operational rigor, and code quality.

• Maintain and improve existing ASP.NET / .NET Core web apps with a React frontend. • Redesign and implement modern authN/authZ (e.g. OAuth2/OIDC, JWT, identity providers). • Plan and execute .NET Core upgrades. • Work with AWS, MySQL, PostgreSQL, and multiple external integrations. • Use Bitbucket, CI/CD, and Playwright tests as part of the delivery workflow. • Collaborate with stakeholders to discuss and prioritize tasks and clarify requirements (in English).