About us: Gismart is a value-driven mobile app developer with a strong presence in the Health & Wellness, Utilities, and Music app markets. We have achieved a significant milestone of over 1 billion downloads worldwide, taking a step toward our mission of cultivating the well-being of people worldwide. With headquarters in London, UK, Gismart is a dynamic global company with a reach extending across Europe and far beyond. Our determined team comprises over 400 individuals who bring diversity, creativity, innovation, and relentless drive to the company. Gismart unites professionals from diverse backgrounds in entertainment, music, and tech, allowing us to play to each other’s strengths and succeed as a team.
Our mission: Become a stepping stone on our customers’ journeys of self-improvement.
Our values:
Deliver what matters
Respect and support others
Initiate and own
Voiceopenly
Execute with quality
If you are passionate about mobile app development and want to join a company that’s reshaping the industry, Gismart is the place for you. We provide exciting career opportunities, a supportive workplace culture, and the chance to contribute to a team that is making a tangible impact. For more information on Gismart, visit gismart.com.
We’re looking for a Senior Backend Engineer to become the first engineering hire on a new product. You’ll play a key role in shaping the product’s technical foundation, making architectural decisions, and owning backend development end-to-end. What you’ll bring:
Core engineering:
4+ years of commercial experience in backend development.
Strong experience with Go, or solid backend expertise in another statically typed language (Java, Kotlin, C#, Rust, or TypeScript) with a willingness to transition to Go from day one.
Hands-on experience designing and building backend services that operate under real production load, with a solid understanding of architectural trade-offs and decision-making.
Strong API design skills (REST, gRPC) with a focus on maintainability, backward compatibility, and building APIs consumed by mobile applications.
Experience integrating third-party APIs, including handling retries, idempotency, rate limiting, and graceful recovery from partial failures.
Data & Infrastructure:
Strong knowledge of PostgreSQL, including transactions, isolation levels, indexing, and maintaining data consistency.
Experience with asynchronous processing and messaging systems such as SQS, Redis, Kafka, Temporal, or similar technologies.
Experience working with cloud platforms (AWS or GCP), Docker, and modern CI/CD pipelines.
Practical experience with observability tools and practices, including metrics, logging, tracing, and independently debugging production issues. Experience with VictoriaMetrics, Grafana, and Sentry is a plus.
Working Environment:
Ability to quickly ramp up on an existing codebase and build on top of it rather than rewriting it from scratch.
Comfortable working in a fast-paced, iterative environment where the product is pre-PMF (Product-Market Fit) and priorities evolve as hypotheses are validated.
Ready to take ownership as the first Product Engineer, driving solutions end-to-end and owning the entire development lifecycle.
Employee Benefits:
Remote-First Culture: Our team is diverse and extensive, just like our product portfolio. We provide a flexible working schedule and let you work anywhere in the world, either remotely or in one of our corporate hubs
Сoworking Compensation: We provide 100% compensation for coworking spaces in Ukraine (except Kyiv, where we have a cozy and autonomous hub) and 50% compensation for coworking spaces worldwide to make sure that everyone has a comfortable and inspiring workspace
Free Office Lunches: We want you to stay fueled and focused, so we provide delicious free lunches for everyone working from our hubs. It’s one less thing for you to worry about during a productive workday
Flexible Public Holidays Policy: Gismart p
