Sigma Software provides top-quality software development, graphic design, testing, and support services. Systems we develop deliver benefit to customers in automotive, telecommunications, aviation, advertising, gaming industry, banking, real estate, and healthcare. We have advanced skills and ample resources to create large-scale solutions as well as guide startups from idea to profit.

Sigma Software

Senior Back-end Developer (Ruby on Rails)

Junior Marketing Automation Specialist

Senior Node.js Developer (FinTech Project)

Senior Android Developer (FinTech/Blockchain Project)

Senior iOS Developer (Fintech/Blockchain)

Middle Java Developer

WordPress Developer

Middle Front-End Developer

We are seeking a Senior Back-end Developer to design and implement reliable, scalable, high-performance systems, collaborating with engineering teams to deliver robust solutions. The role involves maintaining healthy Back-end services, ensuring high quality, designing and implementing unit tests, and generating new ideas for features. The company aims to provide an asymmetric advantage to AdTech customers through expertise, simplicity, and exceptional service, fostering a culture of dedication, trust, and continuous improvement.

Marketing Automation Specialist

<h2 class="text-2xl md:text-3xl font-bold mt-10 mb-4 border-b pb-2 text-gray-800">Company Description</h2>We’re looking for a Senior Back-end Developer to design and implement reliable, scalable, high-performance systems and collaborate closely with our engineering teams to deliver robust solutions that drive real impact.At the heart of what we do is a simple mission: to deliver an asymmetric advantage to our AdTech Сustomers through deep expertise, simplicity, and exceptional service. We challenge ourselves to grow – as technologists, professionals, and teammates who support one another every step of the way.Our culture is built on dedication, trust, and continuous improvement. We celebrate success together, learn from our failures, and take pride in delivering outstanding results for our clients.If this sounds like the kind of environment where you’d thrive – join us and help build what’s next.CUSTOMEROur Customer provides a novel approach to office meals. Through their platform, customers get automated and organized lunches, serving individual and customizable meals to offices from restaurants. They offer their customers a competitive advantage through their extensive industry knowledge, straightforward process, and a high level of service.The Customer is extremely open to the team’s professional opinion, so you will have a chance to initiate changes and improve the existing solution.<h2 class="text-2xl md:text-3xl font-bold mt-10 mb-4 border-b pb-2 text-gray-800">Job Description</h2><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Design and implement solid, scalable, and flexible Back-end systems</li><li class="leading-relaxed">Collaborate with Front-end engineers and QAs to deliver new features together with team members on the client side</li><li class="leading-relaxed">Maintain a healthy Back-end services and a high level of quality</li><li class="leading-relaxed">Design and implement unit tests and highly maintainable code</li><li class="leading-relaxed">Generate great new ideas for features and better ways to implement existing ones</li><li class="leading-relaxed">Take an active part in team meetings and ceremonies</li></ul><h2 class="text-2xl md:text-3xl font-bold mt-10 mb-4 border-b pb-2 text-gray-800">Qualifications</h2><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Experience with Ruby on Rails (Back-end)</li><li class="leading-relaxed">5+ years of solid software engineering experience</li><li class="leading-relaxed">Experience designing and implementing scalable, cloud-based architectures for production-grade Back-end (preferably, have experience with AWS, EC2 load balancing, auto-scaling, CloudWatch, and Aurora)</li><li class="leading-relaxed">Experience with database engineering, including SQL/GraphQL with million-size relational records (preferably, the ability to write and optimize PostgreSQL and GraphQL)</li><li class="leading-relaxed">Ability to design relational schemas appropriate for given use cases</li><li class="leading-relaxed">In-depth understanding of the fundamentals of web technologies, data structures, and algorithms</li><li class="leading-relaxed">Upper-Intermediate level of English</li></ul>Will be a plus:<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Strong development skills in languages such as JavaScript, Ruby, and Python, preferably with a solid background in modern web stacks)</li><li class="leading-relaxed">Experience operating relational databases at scale</li></ul><h2 class="text-2xl md:text-3xl font-bold mt-10 mb-4 border-b pb-2 text-gray-800">Additional Information</h2>PERSONAL PROFILE<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Great communication skills, including written and verbal communication</li><li class="leading-relaxed">Strong time management and prioritization skills, with the ability to work independently</li><li class="leading-relaxed">Demonstrated sense of ownership and accountability in delivering high-quality results</li></ul>

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- This assessment gives us an idea of your C++ skills - Companies that evaluate this skillset in interviews: Rockstar Games, Ubisoft, Mayhem Studios, etc. - 10 Multiple Choice questions - Average time to complete: 7 to 10 minutes

Let's assess your Data Structures! 📋 &nbsp;- This assessment gives us an idea of your problem solving skills using DSA - Companies that evaluate this skillset in interviews: MPL, LILA Games, GSN Games, etc. - 10 Multiple Choice questions - Average time to complete: 7 to 10 minutes

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As a Business Analyst (Core Banking) at Roof Stacks, you will analyze, document, and optimize business processes within Core Banking modules like Treasury, Loans, and Payment Systems. You will gather requirements, translate them into specifications, and collaborate with various teams for end-to-end delivery. The role requires a minimum of 4 years of experience in banking or fintech, with hands-on expertise in core banking domains, understanding of banking workflows, regulatory requirements, and Agile/Scrum methodologies.

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Senior Human Resources Business Partner

Senior Java Developer (PL/SQL)

Senior Business Analyst

Senior Android Developer

Senior iOS Developer

Senior Business Analyst (Finance)

As Roof Stacks, we have been carrying out innovative projects since 2015.We aim to become a global actor in Tourism Systems, Extended Reality (AR/VR), Blockchain Technologies, Game Development, and Financial Technology, which are our core areas of expertise.We focus on creating a difference with the technologies we develop and designing the future.In addition to our headquarters in Ataşehir, İstanbul, we have branches in Antalya and Elazığ, Türkiye.We have also strengthened our position in the global market by opening a new office in Austin, USA, home to many of the world’s leading technology companies.<h3 class="text-xl md:text-2xl font-bold mt-8 mb-3 text-gray-800">What You’ll Do</h3><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Analyze, document, and optimize business processes across Core Banking modules such as Treasury, Loans, and Payment Systems.</li><li class="leading-relaxed">Work closely with stakeholders to gather requirements and translate them into detailed functional and technical specifications.</li><li class="leading-relaxed">Collaborate with development, QA, and architecture teams to ensure smooth end-to-end delivery.</li><li class="leading-relaxed">Support integration, UAT, and production rollout phases of banking projects.</li><li class="leading-relaxed">Conduct gap analysis, define improvement opportunities, and support change management activities.</li></ul><h3 class="text-xl md:text-2xl font-bold mt-8 mb-3 text-gray-800">What We’re Looking For</h3><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Minimum 4 years of professional experience as a Business Analyst in the banking or fintech sector.</li><li class="leading-relaxed">Hands-on experience with core banking domains such as:</li><li class="leading-relaxed">Treasury / Treasury Operations</li><li class="leading-relaxed">Loans</li><li class="leading-relaxed">Credit Management</li><li class="leading-relaxed">Payment Systems (Domestic & International) etc.</li><li class="leading-relaxed">Strong understanding of banking workflows, regulatory requirements, and transaction structures.</li><li class="leading-relaxed">Excellent communication, documentation, and stakeholder management skills.</li><li class="leading-relaxed">Familiarity with Agile/Scrum methodologies.</li></ul>

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Let's assess your Programming Patterns! ????- This assessment gives us an idea of your code architecture skills- Companies that evaluate this skillset in interviews: Dirtcube, PTW, Playshifu, etc.

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Let's assess your OOPs skills! ????- This assessment gives us an idea of your fundamental OOPS concepts and Solid principles skills- Companies that evaluate this skillset in interviews: Hitwicket, GSN Games, Tomo Club, etc.

Object Oriented Programming

Let's assess your Unity Skills ????- This assessment gives us an idea of your Unity fundamentals- Companies you can apply for after taking this assessment: Godspeed games, Salvation Games, nCore Games, etc.

Senior Back-end Developer (Ruby on Rails)

Junior Marketing Automation Specialist

Senior Node.js Developer (FinTech Project)

Senior Android Developer (FinTech/Blockchain Project)

Senior iOS Developer (Fintech/Blockchain)

Senior Node.js Developer (FinTech Project)

Middle Java Developer

WordPress Developer

Middle Front-End Developer

Job Details