Senior Backend (PHP/Golang) Software Engineer

Who we are

Blackbird Lab is a software development company. While we are practicing an international working culture, we are proud representatives of Ukrainian values and traditions. We are a team of 90+ energetic, curious, smart, and open to new challenges tech pros who prefer efficient async communication, flexible working hours, a co-working office model, etc.

Being in this craft for 8+ years, we managed to accumulate expertise and bring value to a number of clients. We cooperate with US and Canadian product companies of different sizes, from small startups to established products, in close, trusted relationships.

All team members, including management, have an engineering background. The process, participants who speak the same language and have a similar approach based on technical principles, is always efficient. It is way easier to make decisions and introduce new features in a team with engineering at heart. It is the technical DNA that lets us build high-quality products that facilitate the lives of our customers’ users.

Position & client

Join a team building a large-scale digital platform used by millions of users worldwide. The product helps consumers discover relevant offers, save money, and make informed purchasing decisions, while enabling retailers and brands to better engage their customers across digital and physical channels.

As a Senior Backend Software Engineer, you will become part of a cross-functional engineering team responsible for designing, building, and maintaining the backend systems that power high-traffic mobile applications. The focus is on delivering scalable, secure, and reliable distributed services.

In this role, you will take end-to-end ownership of backend services, contribute to the design of large-scale distributed systems, and influence technical decisions across the team. You will also mentor engineers, promote engineering best practices, and collaborate closely with Product Managers, Designers, and fellow Software Engineers in an international environment.

What you will do

Your responsibilities span system design, backend development, testing, and technical leadership, with a strong focus on supporting and evolving the distributed backend systems for Flipp and Shopfully’s mobile applications.

Key responsibilities include:

• Design, and evolve scalable, secure, fault-tolerant distributed systems, within an event-driven microservices architecture

• Own and advance backend service architecture with a platform mindset, creating reusable services, APIs, and shared components that enable internal developer community

• Translate product requirements into clear, well-designed technical solutions, collaborating closely with Product, Design, Quality and Data

• Own the end-to-end software development lifecycle, from technical design, estimations, implementation, testing, deployment to production support

• Write clean, robust, and well-tested code, applying SOLID principles, proven design patterns, automated testing, and CI/CD best practices while actively reducing technical debt

• Act as a senior technical leader, guiding architectural decisions, mentoring through code reviews, and serving as a point of reference during production incidents

• Integrate AI-assisted development tools into your daily workflow and help the team adopt effective practices — treating AI tooling as a core part of engineering productivity, not an experiment.
  

What you will need

• 7+ years of backend or full-stack development experience designing and building scalable, reliable backend systems .

• Experience with PHP.

• Experience with Go.

• Proven experience with AWS services (eg: Lambda, API Gateway, S3, etc.).

• Strong experience with relational and/or NoSQL databases; Experience with Docker and Kubernetes.

• Experience with event-driven systems and messaging (e.g., Kafka, SQS/SNS).

• Strong system design expertise with hands-on experience operating and troubleshooting production systems.

• Software engineering practices:

  • Strong grasp of clean-code principles and backend design patterns.

  • Experience writing and maintaining automated unit and integration tests.

  • Experience improving CI/CD pipelines and enforcing testable coding practices.

  • Proficient with Git and modern collaboration workflows.

• Demonstrated use of AI tools in software workflows, with the ability to articulate benefits, limitations, and lessons learned.

• Willingness to participate in on-call rotations and support production systems.
  

Nice to have

• Experience building backend systems that support mobile applications.

• Experience contributing to shared platforms or organization-wide technical initiatives.

• Exposure to large-scale, distributed systems serving millions of users.

• Experience contributing to or maintaining open-source libraries.

Benefits

We are all for the self-development of each team member. As a part of our team, you’ll be supported in your professional growth, work on Macs, receive certifications, and visit conferences. On top of that, you will enjoy an attractive social package, including

• Сompetitive monthly compensation

• Flexible working schedule

• Working remotely

• 18 paid vacation working days

• Paid sick leave (with 5 undocumented days per year)

• Health support with medical insurance or sports programs

• English lessons, sports activities, and charity events

• Full support of Private Entrepreneur reporting services (ФОП)