Senior Software Engineer, Booking Engine

TripStack Inc.; Kraków; On-site; PLN 180,000 - 290,000; Full time

Job summary

Tripstack is seeking a Senior Software Engineer to join the Booking Engine team. You will own the technical direction of pricing, availability and booking flows that serve millions of requests daily.

You will set architectural direction, mentor peers, and balance deep individual contribution with leadership in a fast-paced environment. This senior IC role carries technical leadership scope within the team.

Qualifications

• Bachelor's degree or higher in Computer Science or related technical field.
• 7+ years of professional software engineering with C# and .NET, including .NET Core / .NET 8+.
• Strong command of the .NET runtime under load, performance trade-offs and caching.
• Experience owning production services on call and incident response.
• Proven track record designing scalable, high-availability distributed systems.
• Hands-on with Claude Code or similar AI coding assistants in production.

Responsibilities

• Set and drive the technical direction for Booking Engine services and architecture.
• Design, write, review, test and support C#/.NET code at scale for millions of requests daily.
• Decompose large initiatives into deliverable increments, create stories, deliver and maintain.
• Own latency, availability and cost characteristics of services within reliability targets.
• Maintain and evolve gRPC-based API 2.0 alongside .NET services.
• Identify technology opportunities and push proposals across the organization.
• Collaborate with product managers, client integration teams and other engineers.
• Coordinate and monitor regular releases to production.
• Participate in on-call rotation and drive follow-up actions after incidents.
• Mentor engineers through code/design reviews and knowledge-sharing sessions.

Skills

C#/.NET experience

Distributed systems

Technical leadership

On-call / incident response

AI coding assistants

Education

Bachelor's degree or higher in Computer Science or related technical field

Tools

Docker

Kubernetes

CI/CD tooling

Grafana monitoring

gRPC and protobuf

Job description

About Tripstack

Founded in Toronto, Canada in 2016, Tripstack has been part of Etraveli Group since 2019. It is a B2B Flights as a Service provider and a world leader in virtual interlining.

About Tripstack

Founded in Toronto, Canada in 2016, Tripstack has been part of Etraveli Group since 2019. It is a B2B Flights as a Service provider and a world leader in virtual interlining. Operating from offices in Canada, India, and Poland, Tripstack is the gateway into Etraveli Group’s world leading tech platform - giving partners access to global flight content, virtual interlining, and a full suite of services including payments, fraud prevention, pricing, and customer support. As a world leader in virtual interlining technology, Tripstack connects non-partner, low-cost and full-service carriers, enabling the creation of unique and flexible itineraries through a simple, cost-effective API. Its technology ingest over 30B price points and handles over 240 million searches daily. Through partnerships with airlines, OTAs, and other distribution channels across the globe, Tripstack expands networks, drives new revenue streams, and offers more choice at competitive prices, all backed by robust technology and traveler protection. For more information, visit: www.tripstack.com www.etraveligroup.com

The Role

We are looking for a Senior Software Engineer to join the Booking Engine organization. You will own the technical direction of systems at the core of our product - pricing, availability and booking flows that serve millions of requests per day. Beyond writing code, you will set architectural direction, unblock others, and represent the team's technical position to product and to peer engineering groups. This role suits someone who is a natural problem solver, detail-oriented, and comfortable moving between deep individual contribution and technical leadership in a fast-paced environment. This is a senior individual contributor role with technical leadership scope. We do not have a separate formal tech lead title.

Responsibilities

• Set and drive the technical direction for one or more Booking Engine services - make architecture decisions, document the trade-offs, and act as the technical point of contact in planning, prioritization and dependency discussions


• Design, write, review, test and support C#/.NET code for reliable, high-quality systems at scale serving millions of requests per day


• Break large initiatives into deliverable increments - design solutions, get them reviewed, create stories, deliver and maintain


• Own latency, availability and cost characteristics of your services, and keep them within the reliability targets the organization sets


• Maintain and evolve our gRPC-based API 2.0 alongside the .NET services it fronts, keeping the two in step as the API surface changes


• Proactively identify technology opportunities for the company, and push technical ideas, proposals and plans to the entire organization


• Work cross-functionally with product managers, client integration teams and other engineering groups to deliver high-quality products and improve internal KPIs


• Coordinate and monitor regular releases to production


• Participate in the on-call support rotation, lead the team through incidents impacting live systems, and drive follow-up actions to completion


• Raise the engineering bar, mentor engineers through interactive code review, design review and knowledge-sharing sessions, and help the team make good use of AI-assisted development tooling

Requirements

• Bachelor's degree or higher in Computer Science or related technical field experience


• 7+ years of professional software engineering experience with C# and .NET, including production work on .NET Core / .NET 8+


• Strong command of the .NET runtime under load, including performance trade-offs, caching, profiling and benchmarking


• Strong software design and architecture skills - CS fundamentals, object-oriented analysis and design patterns, and large-scale distributed systems


• Hands-on experience with Claude Code or equivalent AI coding assistants in production work, with sound judgement about when to rely on them and how to review what they produce


• Proven track record of designing and architecting scalable, high-availability distributed systems serving internet traffic direct to consumers or businesses at scale


• Demonstrated technical leadership, having led the design and delivery of a significant system across multiple engineers and grown the engineers around you


• Experience owning production services on call, including leading incident response


• Ability to clearly and concisely communicate with technical and non-technical stakeholders across all levels of the organization

Additional Experience That Would Be Considered An Asset

• Experience designing and publishing client SDKs or public-facing APIs consumed by external partners


• Experience with hybrid Google Cloud Platform or other cloud providers and cloud-native architecture alongside local data centre deployments


• Experience with Docker, Kubernetes and CI/CD tooling


• Experience with monitoring dashboards (Grafana), alerting, logging, and PCI-related work


• Experience with gRPC and protobuf-based service contracts


• Experience with event-driven and asynchronous architectures, including message brokers and delivery guarantees


• Experience in the flight booking domain

Benefits

We offer an opportunity to work with a young, dynamic, and a growing team composed of high-caliber professionals. We value professionalism and promote a culture where individuals are encouraged to do more and be more. If you feel you share our passion for excellence, and growth, then look no further. We have an ambitious mission, and we need a world-class team to make it a reality. Upgrade to a First Class team!

At Tripstack, we proudly believe in embracing diversity. This is true for our team, clients, communities and stakeholders. We are an equal opportunity employer and committed to creating a safe, healthy and accessible environment. We encourage applications regardless of race, colour, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity or any other grounds protected by law. Please let us know if you need any accommodations during any part of the recruitment process.

Tripstack thanks all applicants for their interest, however only those selected to continue in the process will be contacted.

Learn more about us at www.tripstack.com

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